• [ 2024 ]
• [ 2023 ]
• [ 2022 ]
• [ 2021 ]
• [ 2020 ]
• [ 2019 ]
• [ 2018 ]
• [ 2017 ]
• [ 2016 ]
• [ 2014 ]

• Beta decay of the ground state and of a low-lying isomer in 216Bi. Andel, B.; Andreyev, A. N.; Blazhev, A.; Lic˘a, R.; Naïdja, H.; Stryjczyk, M.; Van Duppen, P.; Algora, A.; Antalic, S.; Barzakh, A.; Benito, J.; Benzoni, G.; Berry, T.; Borge, M. J. G.; Chrysalidis, K.; Clisu, C.; Costache, C.; Cubiss, J. G.; De Witte, H.; Fedorov, D. V.; Fedosseev, V. N.; Fraile, L. M.; Fynbo, H. O. U.; Greenlees, P. T.; Harkness-Brennan, L. J.; Huyse, M.; Illana, A.; Jolie, J.; Judson, D. S.; Konki, J.; Lazarus, I.; Madurga, M.; Marginean, N.; Marginean, R.; Marsh, B. A.; Mihai, C.; Molkanov, P. L.; Mosat, P.; Murias, J. R.; Nacher, E.; Negret, A.; Page, R. D.; Pascu, S.; Perea, A.; Pucknell, V.; Rahkila, P.; Rapisarda, E.; Rezynkina, K.; Sánchez-Tembleque, V.; Schomacker, K.; Seliverstov, M. D.; Sotty, C.; Stan, L.; Sürder, C.; Tengblad, O.; Vedia, V.; Viñals, S.; Wadsworth, R.; Warr, N. Phys. Rev. C (2024) 109(6), p. 064321.
  • [ DOI ]
• beta decay of the ground state and of a low-lying isomer in 216Bi. Andel, B.; Andreyev, A. N.; Blazhev, A.; Licifmmode ua}else \ua}\fi{}, R.; Na"i}dja, H.; Stryjczyk, M.; Van Duppen, P.; Algora, A.; Antalic, S.; Barzakh, A.; Benito, J.; Benzoni, G.; Berry, T.; Borge, M. J. G.; Chrysalidis, K.; Clisu, C.; Costache, C.; Cubiss, J. G.; De Witte, H.; Fedorov, D. V.; Fedosseev, V. N.; Fraile, L. M.; Fynbo, H. O. U.; Greenlees, P. T.; Harkness-Brennan, L. J.; Huyse, M.; Illana, A.; Jolie, J.; Judson, D. S.; Konki, J.; Lazarus, I.; Madurga, M.; Marginean, N.; Marginean, R.; Marsh, B. A.; Mihai, C.; Molkanov, P. L.; Mosat, P.; Murias, J. R.; Nacher, E.; Negret, A.; Page, R. D.; Pascu, S.; Perea, A.; Pucknell, V.; Rahkila, P.; Rapisarda, E.; Rezynkina, K.; Sánchez-Tembleque, V.; Schomacker, K.; Seliverstov, M. D.; Sotty, C.; Stan, L.; Sürder, C.; Tengblad, O.; Vedia, V.; Vinals, S.; Wadsworth, R.; Warr, N. Phys. Rev. C (2024) 109(6), p. 064321.
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• Broken seniority symmetry in the semimagic proton mid-shell nucleus 95Rh. Das, B.; Cederwall, B.; Qi, C.; Górska, M.; Regan, P. H.; Aktas, Ö.; Albers, H. M.; Banerjee, A.; Chishti, M. M. R.; Gerl, J.; Hubbard, N.; Jazrawi, S.; Jolie, J.; Mistry, A. K.; Nowacki, F.; Polettini, M.; Yaneva, A.; Ahmed, U.; Alhomaidhi, S.; Algora, A.; Appleton, C.; Arici, T.; Bagchi, S.; Benzoni, G.; Benito, J.; Blazhev, A.; Boutachkov, P.; Bracco, A.; Bruce, A. M.; Brunet, M.; Canavan, R.; Davinson, T.; Dickel, T.; Esmaylzadeh, A.; Fraile, L. M.; Haettner, E.; Hall, O.; Häfner, G.; Heggen, H.; Hornung, Ch.; Hucka, J. P.; John, P. R.; Kahl, D.; Karayonchev, V.; Kern, R.; Knöbel, R.; Korgul, A.; Kosir, G.; Kojouharov, I.; Kostyleva, D.; Kuzminchuk, N.; Kurz, N.; Liotta, R.; Lozeva, R.; Mikolajczuk, M.; Mukha, I.; Napiralla, P.; Page, R.; Petrache, C. M.; Pietralla, N.; Pietri, S.; Plaß, W. R.; Podolyák, Zs.; Régis, J.-M.; Rudigier, M.; Rösch, H.; Ruotsalainen, P.; Sahin, E.; Sánchez-Tembleque, V.; Schaffner, H.; Scheidenberger, C.; Schirru, F.; Sexton, L.; Singh, B. S. Nara; Sharma, A.; Shearman, R.; Si, M.; Tanaka, Y. K.; Vasiljevi´c, J.; Vesi´c, J.; Vilhena, J.; Weick, H.; Wollersheim, H. J.; Werner, V.; Wiederhold, J.; Witt, W.; Woods, P. J.; Zimba, G.; Zhao, J. Phys. Rev. Res. (2024) 6(2), p. L022038.
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• Structure of low-lying states in 116Te. von Spee, F.; Beckers, M.; Blazhev, A.; Dewald, A.; Dunkel, F.; Esmaylzadeh, A.; Fransen, C.; Hackenberg, G.; Jolie, J.; Knafla, L.; Lakenbrink, C.-D.; Schiffer, M.; Warr, N.; Weinert, M. Phys. Rev. C (2024) 109(2), p. 024325.
  • [ Abstract ]
  • [ DOI ]
  Low-lying excited levels in 116Te were studied by measuring level lifetimes with the recoil-distance Doppler-shift method in the 112Sn(12C,8Be)116Te α-transfer reaction and angular correlations following the β decay of 116I. Both experiments were performed at the Cologne FN Tandem accelerator. Several new levels were discovered below 3.2 MeV excitation energy, spins and multipole mixing ratios were determined via angular correlations. Lifetimes were measured for the 2_1^+, 0_2^+, 2_2^+, and 4_1^+ and upper limits for lifetimes were determined for higher lying levels. The experimental findings are compared to calculations in the U(5) limit of the interacting boson model and are also discussed in the framework of shape coexistence which is expected in midshell Te isotopes.
• Prompt gamma rays of terbium induced by inelastic scattering of fission neutrons. Ophoven, N.; Ilic, Z.; Mauerhofer, E.; Randriamalala, T. H.; Vezhlev, E.; Stieghorst, C.; Révay, Z.; Jolie, J.; Strub, E. J. Radioanal. Nucl. Chem. (2024) 333(3), pp. 1287–1300.
  • [ Abstract ]
  • [ DOI ]
  Prompt gamma rays of terbium emitted after (n,nʹγ) inelastic scattering reactions induced by irradiation of a terbium(III) hexahydrate (TbCl3·6H2O) sample with a beam of fission neutrons were investigated with the instrument FaNGaS (Fast Neutron-induced Gamma-ray Spectrometry) at an angle of 90° between neutron beam and detector. At sample position, the fast-neutron flux was 1.13 × 108 cm−2 s−1 and the neutron beam has an average energy of 2.30 MeV. We identified 124 prompt gamma lines from the 159Tb(n,nʹγ)159Tb reaction. Presence of prompt gamma rays from oxygen and chlorine was used for a concise verification of recently published results. Relative gamma-ray intensities, effective cross sections and fast-neutron spectrum-averaged partial production cross sections of the gamma lines are given including comparisons with available literature data. We found a reasonable agreement and the multitude of unreported lines adds decisive value to nuclear spectroscopy. Additionally, we estimated the detection limit of terbium as 1 mg for a counting time of 12 h.
• Lifetime measurement for the 15/2_1- and 13/2_1- levels in 129Sn. Kumar, D.; Pal, A.; Basak, S.; Bhattacharjee, T.; Alam, S. S.; Gerhard, L.; Knafla, L.; Esmaylzadeh, A.; Ley, M.; Dunkel, F.; Schomaker, K.; Régis, J.-M.; Jolie, J.; Kim, Y. H.; Köster, U. Phys. Rev. C (2024) 109(2), p. 024304.
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• Compound-Nucleus and Doorway-State Decays of Beta-Delayed Neutron Emitters 51,52,53K. Xu, Z. Y.; Grzywacz, R.; Gottardo, A.; Madurga, M.; Alonso, I. M.; Andreyev, A. N.; Benzoni, G.; Borge, M. J. G.; Cap, T.; Costache, C.; De Witte, H.; Dimitrov, B. I.; Escher, J. E.; Fijalkowska, A.; Fraile, L. M.; Franchoo, S.; Fynbo, H. O. U.; Gonsalves, B. C.; Gross, C. J.; Harkness-Brennan, L. J.; Heideman, J.; Huyse, M.; Judson, D. S.; Kawano, T.; King, T. T.; Kisyov, S.; Kolos, K.; Korgul, A.; Lazarus, I.; Lica, R.; Liu, M. L.; Lynch, L.; Marginean, N.; Marginean, R.; Mazzocchi, C.; Mengoni, D.; Mihai, C.; Morales, A. I.; Page, R. D.; Pakarinen, J.; Paulauskas, S. V.; Perea, A.; Piersa-Siłkowska, M.; Podolyák, Zs.; Sotty, Ch.; Taylor, S.; Tengblad, O.; Van Duppen, P.; Vedia, V.; Verney, D.; Warr, N.; Yuan, C. X. Phys. Rev. Lett. (2024) 133(4), p. 042501.
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• Low-spin states in 118Sn populated by the radiative capture of thermal neutrons. Ortner, K.; Andreoiu, C.; Petrache, C. M.; Qi, Chong; Astier, A.; Bucher, T. D.; Colombi, G.; Dupont, E.; Garcia, F. H.; Garrett, P. E.; Guo, S.; Häfner, G.; Jigmeddorj, B.; Jolie, J.; Kandzia, F.; Karayonchev, V.; Kim, Y.-H.; Knafla, L.; Lv, B. F.; Mãrginean, N.; McGee, E.; Michelagnoli, C.; Mihai, C.; Mutti, P.; Porzio, C.; Raymond, K.; Régis, J.-M.; Saed-Samii, N.; Spagnoletti, P.; Urban, W.; Valbuena, S.; Vanhoy, J. R.; Whitmore, K.; Wisniewski, J.; Yates, S. W. Phys. Rev. C (2024) 109(5), p. 054317.
  • [ DOI ]
• Investigating the prolate-to-oblate shape phase transition: Lifetime measurements and γ spectroscopy of the low-lying negative parity structure in 193Os. Knafla, L.; Nomura, K.; Esmaylzadeh, A.; Harter, A.; Jolie, J.; Karayonchev, V.; Kim, Y. H.; Köster, U.; Ley, M.; Michelagnoli, C.; Pfeil, A.; Régis, J.-M.; von Spee, F. Phys. Rev. C (2024) 109(1), p. 014313.
  • [ Abstract ]
  • [ DOI ]
  Excited states in 193Os were populated using a 192Os({n}_{\{th.}},γ)193Os thermal neutron capture reaction, with neutrons provided by the high-flux reactor of the Institut Laue-Langevin in Grenoble, France. Lifetimes of low-spin excited states were measured using the generalized centroid difference method. A total of eight mean lifetimes of low-lying excited states were determined for the first time, and limits for the lifetimes of three further excited states were established. Additionally, γ−γ angular correlations were analyzed to assign spins to previously known excited states up to 1 MeV, and extract multipole mixing ratios for several transitions. The new spectroscopic information is compared to calculations in the framework of the interacting boson-fermion model, based on the nuclear density functional theory, to investigate the prolate-to-oblate shape phase transition, predicted to occur in the neutron rich A≈190 region.

• Lifetime measurements in low yrast states and spectroscopic peculiarities in 182Os. Harter, A.; Esmaylzadeh, A.; Knafla, L.; Fransen, C.; Spee, F. v.; Jolie, J.; Ley, M.; Karayonchev, V.; Fischer, J.; Pfeil, A. Phys. Rev. C (2023) 108(2), p. 024305.
  • [ Abstract ]
  • [ DOI ]
  Lifetimes of the low-lying yrast states 2+,4+, and 6+ of the unstable nucleus 182Os were measured using digital fast-timing techniques. The lifetimes of the 4+ and 6+ states were determined for the first time. The remeasured value for the lifetime of the 2_1+ state was taken into account to evaluate the discrepancy between two inconsistent literature values. The lifetimes and extracted B(E2) values are presented and discussed in terms of collective signatures and transitional phenomena. The B(E2;4_1+→2_1+)/B(E2;2_1+→0_1+) ratio of 1.39(7) supports the interpretation of 182Os as a rigid rotor. This value is discussed in the context of these of the neighboring isotopes and isotones and calculations in the framework of the interacting boson model 1. Additionally, competing influences from the near lying collective deformed region,γ-soft rotors, X(5) symmetry, and neighboring regions of shape coexistence in low excitation states are assumed to influence the structure of the nucleus of interest: The trend of the excitation energies of the γ- and Kπ=0–bands in the osmium isotopic chain change remarkably at 182Os. This consideration helps to us delimit and understand the structural transitions in the isotopic and isotonic chains that intersect at 182Os.
• Systematic investigation of time walk and time resolution characteristics of CAEN digitizers V1730 and V1751 for application to fast-timing lifetime measurement. Harter, A.; Weinert, M.; Knafla, L.; Régis, J.-M.; Esmaylzadeh, A.; Ley, M.; Jolie, J. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment (2023) 1053, p. 168356.
  • [ Abstract ]
  • [ DOI ]
  The timing performance of the integrated digital constant fraction discriminators of the two digitizer modules V1730 and V1751 from CAEN are systematically investigated with respect to fast-timing lifetime measurements. Systematic and parameter-dependent knowledge of the time walk behavior and the time resolution of the digital constant fraction discriminators is obtained. Understanding these dependencies is crucial for properly calibrating individual fast-timing systems and a comparable investigation of these digitizers was never conducted before. Reference is made to the existing analog standard for fast-timing techniques and recent digital developments. The study shows, that the timing performance of both modules is comparable to other digital fast-timing implementations and established fast-timing setups using analog constant fraction discriminators, but with the added benefit of digital processing. The peculiarities of the modules are pointed out and described. Both digitizer modules were found to be highly effective and user-friendly instruments for modern fast-timing requirements. Best parameter sets for both digitizers as well as best energy application ranges are provided.
• Shape evolution in even-mass 98-104Zr isotopes via lifetime measurements using the gamma-gamma-coincidence technique. Pasqualato, G.; Ansari, S.; Heines, J. S.; Modamio, V.; Görgen, A.; Korten, W.; Ljungvall, J.; Clément, E.; Dudouet, J.; Lemasson, A.; Rodríguez, T. R.; Allmond, J. M.; Arici, T.; Beckmann, K. S.; Bruce, A. M.; Doherty, D.; Esmaylzadeh, A.; Gamba, E. R.; Gerhard, L.; Gerl, J.; Georgiev, G.; Ivanova, D. P.; Jolie, J.; Kim, Y.-H.; Knafla, L.; Korichi, A.; Koseoglou, P.; Labiche, M.; Lalkovski, S.; Lauritsen, T.; Li, H.-J.; Pedersen, L. G.; Pietri, S.; Ralet, D.; Regis, J. M.; Rudigier, M.; Saha, S.; Sahin, E.; Siem, S.; Singh, P.; Söderström, P.-A.; Theisen, C.; Tornyi, T.; Vandebrouck, M.; Witt, W.; Zielińska, M.; Barrientos, D.; Bednarczyk, P.; Benzoni, G.; Boston, A. J.; Boston, H. C.; Bracco, A.; Cederwall, B.; Ciemała, M.; de France, G.; Domingo-Pardo, C.; Eberth, J.; Gadea, A.; González, V.; Gottardo, A.; Harkness-Brennan, L. J.; Hess, H.; Judson, D. S.; Jungclaus, A.; Lenzi, S. M.; Leoni, S.; Menegazzo, R.; Mengoni, D.; Michelagnoli, C.; Napoli, D. R.; Nyberg, J.; Podolyák, Zs.; Pullia, A.; Recchia, F.; Reiter, P.; Rezynkina, K.; Salsac, M. D.; Sanchis, E.; Şenyiğit, M.; Siciliano, M.; Simpson, J.; Sohler, D.; Stezowski, O.; Valiente-Dobón, J. J.; Verney, D. The European Physical Journal A (2023) 59(11), p. 276.
  • [ Abstract ]
  • [ DOI ]
  The Zirconium (Z = 40) isotopic chain has attracted interest for more than four decades. The abrupt lowering of the energy of the first 2+ state and the increase in the transition strength B(E2; 2^+1, 0^+1) going from 98Zr to 100Zr has been the first example of ``quantum phase transition'' in nuclear shapes, which has few equivalents in the nuclear chart. Although a multitude of experiments have been performed to measure nuclear properties related to nuclear shapes and collectivity in the region, none of the measured lifetimes were obtained using the Recoil Distance Doppler Shift method in the gamma gamma -coincidence mode where a gate on the direct feeding transition of the state of interest allows a strict control of systematical errors. This work reports the results of lifetime measurements for the first yrast excited states in 98-104Zr carried out to extract reduced transition probabilities. The new lifetime values in gamma gamma -coincidence and gamma -single mode are compared with the results of former experiments. Recent predictions of the Interacting Boson Model with Configuration Mixing, the Symmetry Conserving Configuration Mixing model based on the Hartree--Fock--Bogoliubov approach and the Monte Carlo Shell Model are presented and compared with the experimental data.
• Response of the FAst TIMing Array (FATIMA) for DESPEC at FAIR Phase-0. Chishti, M.M.R.; Jazrawi, S.; Shearman, R.; Regan, P.H.; Podolyák, Zs.; Collins, S.M.; Górska, M.; Cederwall, B.; Yaneva, A.; Zhang, G.X.; Cederkall, J.; Goasduff, A.; Albers, H.M.; Alhomaidhi, S.; Banerjee, A.; Bruce, A.M.; Benzoni, G.; Das, B.; Davinson, T.; Fraile, L.M.; Gerl, J.; Häfner, G.; Jolie, J.; Hubbard, N.; John, P.R.; Lozeva, R.; Mistry, A.K.; Singh, B.S. Nara; Mikolajczuk, M.; Polettini, M.; Pietralla, N.; Regis, J.M.; Rudigier, M.; Sahin, E.; Sharma, A.; Si, M.; Vesic, J.; Werner, V. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment (2023) 1056, p. 168597.
  • [ Abstract ]
  • [ DOI ]
  The Monte-Carlo simulated response for γ-ray detection of the FAst TIMing Array (FATIMA) for exploitation within the DEcay SPECtroscopy (DESPEC) experimental system at the FAIR Phase-0 facility at Darmstadt, Germany is presented. In this configuration, FATIMA consisted of 36 LaBr3(Ce) detectors surrounding the AIDA, position-sensitive charged-particle active stopper. The decay of the Iπ=8+ isomer-fed decay cascade in 96Pd, measured in the first DESPEC experiment at the FAIR-0 facility was used to validate the simulations. The experimental data yielded in-situ full-energy peak efficiency values for FATIMA of 11.2(11)%, 6.8(7)%, 3.8(4)% and 2.1(4)% at 106, 325, 684 and 1415 keV respectively, consistent with the values derived from the simulated response.
• Updated analysis of the 170Er(p,t)168Er reaction data. Bucurescu, D.; Pascu, S.; Graw, G.; Hertenberger, R.; Wirth, H.-F.; Faestermann, T.; Krücken, R.; Mahgoub, M.; Jolie, J.; Brentano, P. von.; Heinze, S.; Möller, O.; Casten, R. F.; Meyer Brittingham, D. A. Phys. Rev. C (2023) 108, p. 014310.
  • [ Abstract ]
  • [ DOI ]
  More than 200 states up to 4.1 MeV excitation have been populated in 168Er with the 170Er(p,t) reaction at 25 MeV incident energy. About 80 of these states, with 0+ and 2+ assignments, were reported in a previous publication [D. Bucurescu et al., Phys. Rev. C 73, 064309 (2006)]. The present work considerably enriches the knowledge of this nucleus. A multistep coupled-channels analysis of the angular distributions is now presented for all the states observed in this experiment. Spin and parity values between 0+ and 7− are newly assigned for more than 100 states. For the states already reported in the ENSDF database with Jπ values there is a good agreement with our values. The 168Er nucleus remains one of the best experimentally known nuclei for states with low and medium spins below 4 MeV excitation energy, representing a challenge for future microscopic structure model calculations aiming to disentangle the contributions of different excitation degrees of freedom.
• Testing the predictive power of realistic shell model calculations via lifetime measurement of the 11/2+ state in 131Sb. Bottoni, S.; Gamba, E. R.; De Gregorio, G.; Gargano, A.; Leoni, S.; Fornal, B.; Brancadori, N.; Ciconali, G.; Crespi, F. C. L.; Cieplicka-Oryńczak, N.; Iskra, Ł. W.; Colombi, G.; Kim, Y. H.; Köster, U.; Michelagnoli, C.; Dunkel, F.; Esmaylzadeh, A.; Gerhard, L.; Jolie, J.; Knafla, L.; Ley, M.; Régis, J.-M.; Schomaker, K.; Sferrazza, M. Phys. Rev. C (2023) 107(1), p. 014322.
  • [ Abstract ]
  • [ DOI ]
  The lifetime of the 11/2+1 state in the 131Sb nucleus was measured at the LOHENGRIN spectrometer of the Institut Laue-Langevin via neutron-induced fission of 235U using γ-ray fast-timing techniques. The obtained value of T1/2=3(2) ps, at the edge of the sensitivity of the experimental method, is the first result for the 11/2+1 state half-life in neutron-rich Sb isotopes. The corresponding quadrupole reduced transition probability to the ground state is B(E2)=1.4+1.5−0.6W.u., indicating a noncollective nature of this state. Realistic shell-model calculations performed in a large valence space reproduce well the experimental value and point to a dominant 2+(130Sn)⊗πg7/2 configuration for the 11/2+1 state, as expected in a weak-coupling scenario. At the same time, the sum of the quadrupole strength of the multiplet states is predicted to exceed the one of the 130Sn core as a consequence of the equal contribution of the proton and the proton-neutron quadrupole matrix elements, pointing to possible development of collectivity already in the close neighborhood of 132Sn.
• Lifetime measurements in 99Nb and 99Zr: Investigation of shape coexistence. Pfeil, A.; Nomura, K.; Gavrielov, N.; Régis, J.-M.; Köster, U.; Kim, Y. H.; Esmaylzadeh, A.; Harter, A.; Jolie, J.; Knafla, L.; Ley, M.; Karayonchev, V. Phys. Rev. C (2023) 108(3), p. 034310.
  • [ Abstract ]
  • [ DOI ]
  The A≈100 mass region is of special interest due to a rapid shape transition, observed by going from neutron number 58 to 60, especially pronounced in the Zr isotopes, where 98Zr is weakly and 100Zr is strongly deformed. To further examine this intricate phenomenon, in this work lifetimes of low-lying excited states in the nuclei 99Zr and 99Nb were determined using fast-timing techniques and an experimental setup consisting of four LaBr3(Ce) detectors. Neutron rich A=99 fragments were produced in neutron induced fission and separated by the spectrometer LOHENGRIN at the Institut Laue-Langevin in Grenoble, France. Experimental values are compared to two different calculations in the framework of the interacting boson-fermion model and discussed in the context of shape coexistence.
• Lifetime measurements in 96Rb via fast-timing techniques: Investigating shape coexistence at A≃100. Gamba, E. R.; Bottoni, S.; Iskra, Ł. W.; Zavaglia, C.; Leoni, S.; Fornal, B.; Cieplicka-Oryńczak, N.; Benzoni, G.; Colombi, G.; Crespi, F. C. L.; Esmaylzadeh, A.; Jentschel, M.; Jolie, J.; Karayonchev, V.; Kim, Y. H.; Knafla, L.; Köster, U.; Ley, M.; Mǎrginean, N.; Mǎrginean, R.; Michelagnoli, C.; Polettini, M.; Porzio, C.; Régis, J-.M.; Reygadas, D.; Turturica, A. Phys. Rev. C (2023) 108(6), p. 064301.
  • [ Abstract ]
  • [ DOI ]
  Lifetime measurements of the 3-, 4-, and 6- intraband states in the neutron-rich, odd-odd 96Rb nucleus were performed at the LOHENGRIN spectrometer of Institut Laue-Langevin, using thermal-neutron-induced fission of 235U and fast-timing techniques with LaBr3(Ce) scintillator detectors. The nanosecond isomeric nature of the (3-) bandhead was established as well as the β2=0.39(3) deformation parameter of the band, pointing to a robust deformation in 96Rb. Moreover, a hindered B(E2) value of 3.9_-13^+19×(10-2) W.u. was found for the γ decay of the deformed 4- state to the spherical 2- ground state. A retardation was also found for the 3- → 2- transition, possibly due to the shape change and giving strong support to a shape coexistence scenario in this nucleus, at the borders of the island of deformation at N=60. Analogies with the structure of the 98Y isotone are discussed.
• Lifetime measurements in 206Po with a shell-model interpretation. Karayonchev, V.; Jolie, J.; Bittner, D.; Beckers, M.; Esmaylzadeh, A.; Fischer, J.; Fransen, C.; Garbe, J.; Knafla, L.; Lakenbrink, C.-D.; Ley, M. Phys. Rev. C (2023) 108(5), p. 054302.
  • [ Abstract ]
  • [ DOI ]
  The lifetimes of the first excited 2+ and 4+ states in 206Po were measured using the recoil-distance Doppler-shift method. The experimental results were compared to large-scale shell-model calculations that describe the deduced transition probabilities well. Those calculations were extended to the neighboring 204,208Po isotopes giving a good overall description of the yrast states. However, the calculations underpredict the energies of the 6_1+ and 8_1+ states, which suggests that further improvement of the proton-neutron interaction is required.
• Improving fast-timing time-walk calibration standards: Lifetime measurement of the 2_1+ state in 152Gd. Knafla, L.; Harter, A.; Ley, M.; Esmaylzadeh, A.; Régis, J.-M.; Bittner, D.; Blazhev, A.; von Spee, F.; Jolie, J. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment (2023) 1052, p. 168279.
  • [ Abstract ]
  • [ DOI ]
  A 152Eu source was measured for 28 days using an experimental setup consisting of four LaBr3(Ce) detectors, connected to a CAEN V1730 digitizer, implementing online interpolation constant fraction discrimination for picosecond-precise timestamp determination. Using the definition of the time-walk curve, the lifetime of the 21+ (344 keV) state in 152Gd was re-measured, resulting in τ(21+)=46.9(3) ps. Compared to the previously adopted lifetime the uncertainty is reduced by an order of magnitude. This improved lifetime is of significant importance for electronic fast-timing lifetime measurements, and the impact on the systematic correction procedure and lifetime measurements in the low picosecond regime are discussed.
• Lifetime measurements in 92Mo: Investigation of seniority conservation in the N=50 isotones. Ley, M.; Knafla, L.; Jolie, J.; Esmaylzadeh, A.; Harter, A.; Blazhev, A.; Fransen, C.; Pfeil, A.; Régis, J.-M.; Van Isacker, P. Phys. Rev. C (2023) 108(6), p. 064313.
  • [ Abstract ]
  • [ DOI ]
  Excited states in the yrast and negative parity bands in 92Mo were populated in two different experiments using the 90Zr(α,2n)92Mo and 93Nb(p,2n)92Mo fusion-evaporation reactions at the Cologne FN Tandem accelerator and measured using a hybrid setup of high purity germanium and lanthanum bromide detectors. Lifetimes of the excited 2_1^+, 4_1^+, 6_1^+, 8_1^+, 5_1^-, 7_1^- and 9_1^- states were measured using the γ-γ fast-timing technique. The newly measured lifetime of the 4_1^+ state differs from the recently published value measured using the recoil distance Doppler shift method. Experimental B(E2) strengths of excited states in 92Mo are used to predict theoretical B(E2) values in the N=50 isotones from 93Tc up to 95Rhusing semiempirical calculations in the single-j orbital 0g_9/2 for the protons.
• X-ray-γ fast-timing lifetime measurement of the 6_1+ state in 206Po. Stoychev, K.; Djongolov, M.; Karayonchev, V.; Rainovski, G.; Ley, M.; Jolie, J.; Bittner, D.; Blazhev, A.; Dunkel, F.; Esmaylzadeh, A.; Fransen, C.; Garbe, J.; Gerhard, L. M.; Gerst, R.-B.; Geusen, K.; Gladnishki, K. A.; Häfner, G.; Kalaydjieva, D.; Klöckner, L.; Knafla, L.; Kocheva, D.; Kornwebel, L.; Müller-Gatermann, C.; Nikodem, E.; Régis, J.-M.; Schomacker, K.; Stoyanova, M. Phys. Rev. C (2023) 108(1), p. 014316.
  • [ Abstract ]
  • [ DOI ]
  Low-lying states in 206Po were investigated using the fast-timing technique with LaBr3(Ce) and high-purity germanium detectors. The excited states in this nucleus were populated via two consecutive electron capture decays from 206Rn. The parent isotope was produced in the 194Pt(16O,4n)206Rn fusion-evaporation reaction at the FN-Tandem facility at the Institute for Nuclear Physics, University of Cologne. The previously known value for the lifetime of the 4_1+ state in 206Po was confirmed using the generalized centroid difference (GCD) method. The lifetime of the 6_1+ state was determined from β decay in the first application of the GCD method for x-ray–γ coincidences. A Monte Carlo based approach was applied to address the indirect population of the 6_1+ state by the decay of 206At. The experimental results were examined in the context of the transition of single-particle excitations to collective behavior in the neutron-deficient Po isotopes. The obtained B(E2;6_1+→4_1+) value suggests that for the 6_1+ states in even-even Po isotopes the transition from a noncollective regime at N=126 to a collective regime occurs at N≤120.
• Prompt gamma rays from fast neutron induced reactions on cerium and chlorine. Ophoven, Niklas; Ilic, Zeljko; Mauerhofer, Eric; Randriamalala, Tsitohaina H.; Vezhlev, Egor; Stieghorst, Christian; Révay, Zsolt; Brückel, Thomas; Jolie, Jan; Strub, Erik. Journal of Radioanalytical and Nuclear Chemistry 232 (2023) 3133 (2023) 332(8), pp. 3133–3145.
  • [ Abstract ]
  • [ DOI ]
  Prompt gamma rays of cerium and chlorine were investigated with the FaNGaS (Fast Neutron-induced Gamma-ray Spectrometry) instrument operated at the Heinz Maier-Leibnitz Zentrum (MLZ) in Garching. The gamma radiation was emitted from (n,n'), (n,p) and (n,α) reactions induced by the irradiation of a cerium(III) chloride (CeCl3) sample with a beam of fission neutrons. Additionally, a polyvinylchloride (PVC, (C2H3Cl)n) sample was irradiated to verify possible interferences between gamma lines of cerium and chlorine. We identified 87 prompt gamma lines of cerium and chlorine. From these, we assigned 58 lines to the (n,n') reaction in cerium (one for 136Ce, 41 for 140Ce and 16 for 142Ce), 23 to the (n,n') reaction in chlorine (15 for 35Cl and 8 for 37Cl), 5 lines to the 35Cl(n,p)35S reaction and 1 line to the 35Cl(n,α)32P reaction. We present relative intensities and fast-neutron spectrum-averaged partial cross sections of the aforementioned gamma lines and compare them with available literature data. Identification of new lines and discussion of possible errors adds important value to the literature data found to be consistent with our results. In addition, for a counting time of 12 h we estimate the detection limits for cerium and chlorine as 1 and 2 mg, respectively.
• Lifetime measurement of excited states in 116Xe. Lakenbrink, Casper-David; Beckers, Marcel; Blazhev, Andrey; Dewald, Alfred; Dunkel, Felix; Esmaylzadeh, Arwin; Fransen, Christoph; Jolie, Jan; Knafla, Lukas; Müller-Gatermann, Claus; von Spee, Franziskus; Zell, Karl-Oskar. The European Physical Journal A (2023) 59(12), p. 290.
  • [ Abstract ]
  • [ DOI ]
  Lifetimes of excited states in 116Xe were measured using the recoil-distance Doppler-shift technique. Excited 116Xe nuclei were populated in the fusion-evaporation reaction 102Pd(16O,2n)116Xe. Lifetimes of the 2+_1 and 4+_1 states were evaluated using the differential decay-curve method with gamma gamma -coincidence data as well as lifetimes of the 6+_1 and 7-_1 states using simulations of spectra considering Doppler-shift attenuation effects.

• Investigation of gamma softness: Lifetime measurements in 104,106Ru. Esmaylzadeh, A.; Blazhev, A.; Nomura, K.; Jolie, J.; Beckers, M.; Fransen, C.; Gerst, R.-B.; Harter, A.; Karayonchev, V.; Knafla, L.; Ley, M.; von Spee, F. Phys. Rev. C (2022) 106(6), p. 064323.
  • [ DOI ]
• Commissioning the FAst TIMing array (FATIMA) at FAIR Phase-0: Half-lives of excited states in the N=50 isotones 96Pd and 94Ru. Jazrawi, S.; Yaneva, A.; Polettini, M.; Das, B.; Regan, P.H.; Górska, M.; Cederwall, B.; Jolie, J.; Albers, H.M.; Chishti, M.M.R.; Banerjee, A.; Hubbard, N.; Mistry, A.K.; Rudigier, M.; Benzoni, G.; Gerl, J.; Bruce, A.M.; Podolyák, Zs; Nara Singh, B.S.; Zhang, G.X.; Alhomaidhi, S.; Appleton, C.; Arici, T.; Blazhev, A.; Davinson, T.; Esmaylzadeh, A.; Fraile, L.M.; Häfner, G.; Hall, O.; John, P.R.; Karayonchev, V.; Koujoharov, I.; Kurz, N.; Mikolajczuk, M.; Pietralla, N.; Pietri, S.; Regis, J.M.; Sahin, E.; Sexton, L.; Schaffner, H.; Scheidenberger, C.; Sharma, A.; Vesic, J.; Weick, H.; Werner, V.; Lozeva, R.; Si, M. Radiation Physics and Chemistry (2022) 200, p. 110234.
  • [ Abstract ]
  • [ DOI ]
  This paper reports results of the first experiment of the DESPEC Phase-0 campaign at GSI, which focused on the study of neutron-deficient nuclei approaching 100Sn. These data provide the first extended commissioning experiment for the DESPEC collaboration within NuSTAR. We present results on electromagnetic transition rates associated with the decays from excited states populated following the formation of Iπ = 8+ proton ‘seniority-isomer’ states in the N = 50 isotones 94Ru and 96Pd. Direct half-life measurements via γ−γ coincidences using the FATIMA detector array consisting of 36 LaBr3(Ce) scintillators have determined the reduced matrix elements associated with decays between low-lying states in these semi-magic nuclei. The extracted half-lives for yrast Iπ = 6+ and 4+ states in 96Pd and the 6+ state in 94Ru are consistent with the published, highest-precision values for these nuclei.
• Gamma-ray spectroscopy of low-lying yrast and non-yrast states in neutron-rich 94,95,96Kr. Gerst, R.-B.; Blazhev, A.; Moschner, K.; Doornenbal, P.; Obertelli, A.; Nomura, K.; Ebran, J.-P.; Hilaire, S.; Libert, J.; Authelet, G.; Baba, H.; Calvet, D.; Château, F.; Chen, S.; Corsi, A.; Delbart, A.; Gheller, J.-M.; Giganon, A.; Gillibert, A.; Lapoux, V.; Motobayashi, T.; Niikura, M.; Paul, N.; Roussé, J.-Y.; Sakurai, H.; Santamaria, C.; Steppenbeck, D.; Taniuchi, R.; Uesaka, T.; Ando, T.; Arici, T.; Browne, F.; Bruce, A. M.; Caroll, R.; Chung, L. X.; Cortés, M. L.; Dewald, M.; Ding, B.; Flavigny, F.; Franchoo, S.; Górska, M.; Gottardo, A.; Jolie, J.; Jungclaus, A.; Lee, J.; Lettmann, M.; Linh, B. D.; Liu, J.; Liu, Z.; Lizarazo, C.; Momiyama, S.; Nagamine, S.; Nakatsuka, N.; Nita, C. R.; Nobs, C.; Olivier, L.; Orlandi, R.; Patel, Z.; Podolyák, Zs.; Rudigier, M.; Saito, T.; Shand, C.; Söderström, P.-A.; Stefan, I.; Vaquero, V.; Werner, V.; Wimmer, K.; Xu, Z. Phys. Rev. C (2022) 105(2), p. 024302.
  • [ DOI ]
• Development of a new γ–γ angular correlation analysis method using a symmetric ring of clover detectors. Knafla, L.; Esmaylzadeh, A.; Harter, A.; Jolie, J.; Köster, U.; Ley, M.; Michelagnoli, C.; Régis, J.-M. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment (2022) 1042, p. 167463.
  • [ Abstract ]
  • [ DOI ]
  A new method for γ–γ angular correlation analysis using a symmetric ring of HPGe clover detectors is presented. Pairwise combinations of individual crystals are grouped based on the geometric properties of the spectrometer, constrained by a single variable parameterization based on symmetry considerations. The corresponding effective interaction angles between crystal pairs, as well as the attenuation coefficients are extracted directly from the measured experimental data. Angular correlation coefficients, parameter uncertainties and parameter co-variances are derived using a Monte-Carlo approach, considering all sources of statistical uncertainty. The general applicability of this approach is demonstrated by reproducing known multipole mixing ratios in 177Hf, 152Gd and 116Sn, populated by either β-decay or (n, γ)-reactions, measured at the Institut Laue-Langevin, using the EXILL&FATIMA spectrometer and different configurations of the FIPPS instrument. The derived mixing ratios are in excellent agreement with adopted literature values with comparable or better precision.
• Nature of seniority symmetry breaking in the semimagic nucleus 94Ru. Das, B.; Cederwall, B.; Qi, C.; Górska, M.; Regan, P. H.; Aktas, Ö.; Albers, H. M.; Banerjee, A.; Chishti, M. M. R.; Gerl, J.; Hubbard, N.; Jazrawi, S.; Jolie, J.; Mistry, A. K.; Polettini, M.; Yaneva, A.; Alhomaidhi, S.; Zhao, J.; Arici, T.; Bagchi, S.; Benzoni, G.; Boutachkov, P.; Davinson, T.; Dickel, T.; Haettner, E.; Hall, O.; Hornung, Ch.; Hucka, J. P.; John, P. R.; Kojouharov, I.; Knöbel, R.; Kostyleva, D.; Kuzminchuk, N.; Mukha, I.; Plass, W. R.; Nara Singh, B. S.; Vasiljevi ́c J.; Pietri, S.; Podolyák, Zs.; Rudigier, M.; Rösch, H.; Sahin, E.; Schaffner, H.; Scheidenberger, C.; Schirru, F.; Sharma, A.; Shearman, R.; Tanaka, Y.; Vesi ́c J.; Weick, H.; Wollersheim, H. J.; Ahmed, U.; Algora, A.; Appleton, C.; Benito, J.; Blazhev, A.; Bracco, A.; Bruce, A. M.; Brunet, M.; Canavan, R.; Esmaylzadeh, A.; Fraile, L. M.; Häfner, G.; Heggen, H.; Kahl, D.; Karayonchev, V.; Kern, R.; Korgul, A.; Kosir, G.; Kurz, N.; Lozeva, R.; Mikolajczuk, M.; Napiralla, P.; Page, R.; Petrache, C. M.; Pietralla, N.; Régis, J.-M.; Ruotsalainen, P.; Sexton, L.; Sanchez-Temble, V.; Si, M.; Vilhena, J.; Werner, V.; Wiederhold, J.; Witt, W.; Woods, P. J.; Zimba, G. Phys. Rev. C (2022) 105(3), p. L031304.
  • [ Abstract ]
  • [ DOI ]
  Direct lifetime measurements via γ−γ coincidences using a fast timing detector array consisting of LaBr3(Ce) scintillators has been applied to determine the lifetime of low-lying states in the semimagic (N=50) nucleus 94Ru. The experiment was carried out as the first in a series of “FAIR-0” experiments with the DESPEC experimental setup at the Facility for Antiproton and Ion Research (FAIR). Excited states in 94Ru were populated primarily via the β-delayed proton emission of 95Pd nuclei, produced in the projectile fragmentation of an 850 MeV/nucleon 124Xe beam impinging on a 4 g/cm29Be target. While the deduced E2 strength for the 2+→0+ transition in the yrast cascade follows the expected behavior for conserved seniority symmetry, the intermediate 4+→2+ transition exhibits a drastic enhancement of transition strength in comparison with pure-seniority model predictions as well as standard shell model predictions in the fpg proton hole space with respect to doubly magic 100Sn. The anomalous behavior is ascribed to a subtle interference between the wave function of the lowest seniority ν=2, Iπ=4+ state and that of a close-lying ν=4 state that exhibits partial dynamic symmetry. In addition, the observed strongly prohibitive 6+→4+ transition can be attributed to the same mechanism but with a destructive interference. It is noted that such effects may provide stringent tests of the nucleon-nucleon interactions employed in state-of-the-art theoretical model calculations.
• Lifetime measurements in the tungsten isotopes 176,178,180W. Harter, A.; Knafla, L.; Frießner, G.; Häfner, G.; Jolie, J.; Blazhev, A.; Dewald, A.; Dunkel, F.; Esmaylzadeh, A.; Fransen, C.; Karayonchev, V.; Lawless, K.; Ley, M.; Régis, J.-M.; Zell, K. O. Phys. Rev. C (2022) 106(2), p. 024326.
  • [ DOI ]

• New beta-decaying state in 214Bi. Andel, B.; Van Duppen, P.; Andreyev, A. N.; Blazhev, A.; Grawe, H.; Lica, R.; Naidja, H.; Stryjczyk, M.; Algora, A.; Antalic, S.; Barzakh, A.; Benito, J.; Benzoni, G.; Berry, T.; Borge, M. J. G.; Chrysalidis, K.; Clisu, C.; Costache, C.; Cubiss, J. G.; De Witte, H.; Fedorov, D. V.; Fedosseev, V. N.; Fraile, L. M.; Fynbo, H. O. U.; Greenlees, P. T.; Harkness-Brennan, L. J.; Huyse, M.; Illana, A.; Jolie, J.; Judson, D. S.; Konki, J.; Lazarus, I.; Madurga, M.; Marginean, N.; Marginean, R.; Mihai, C.; Marsh, B. A.; Molkanov, P.; Mosat, P.; Murias, J. R.; Nacher, E.; Negret, A.; Page, R. D.; Pascu, S.; Perea, A.; Pucknell, V.; Rahkila, P.; Rapisarda, E.; Rezynkina, K.; Sánchez-Tembleque, V.; Schomacker, K.; Seliverstov, M. D.; Sotty, C.; Stan, L.; Sürder, C.; Tengblad, O.; Vedia, V.; Vinals, S.; Wadsworth, R.; Warr, N. Phys. Rev. C (2021) 104(5), p. 054301.
  • [ DOI ]
• Spectroscopy and lifetime measurements in ¹³⁴,¹³⁶,¹³⁸Te isotopes and implications for the nuclear structure beyond N=82. Häfner, G.; Lozeva, R.; Naidja, H.; Lebois, M.; Jovancevic, N.; Thisse, D.; Etasse, D.; Canavan, R. L.; Rudigier, M.; Wilson, J. N.; Adamska, E.; Adsley, P.; Babo, M.; Belvedere, K.; Benito, J.; Benzoni, G.; Blazhev, A.; Boso, A.; Bottoni, S.; Bunce, M.; Chakma, R.; Cieplicka-Orynczak, N.; Collins, S. M.; Cortés, M. L.; Davies, P. J.; Delafosse, C.; Fallot, M.; Fornal, B.; Fraile, L. M.; Gerst, R.-B.; Gjestvang, D.; Guadilla, V.; Hauschild, K.; Henrich, C.; Homm, I.; Ibrahim, F.; Iskra, L. W.; Jazwari, S.; Jolie, J.; Korgul, A.; Koseoglou, P.; Kröll, Th.; Kurtukian-Nieto, T.; Le meur, L.; Ljungvall, J.; Lopez-Martens, A.; Matea, I.; Matthieu, L.; Miernik, K.; Nemer, J.; Oberstedt, S.; Paulsen, W.; Piersa, M.; Popovitch, Y.; Porzio, C.; Qi, L.; Ralet, D.; Regan, P. H.; Reygadas Tello, D.; Rezynkina, K.; Sanchez, V.; Schmitt, C.; Söderström, P.-A.; Sürder, C.; Tocabens, G.; Vedia, V.; Verney, D.; Warr, N.; Wasilewska, B.; Wiederhold, J.; Yavahchova, M. S.; Zeiser, F.; Ziliani, S. Phys. Rev. C (2021) 103(3), p. 034317.
  • [ DOI ]
• Triaxiality in the mid-shell nucleus 112Pd. Esmaylzadeh, A.; Karayonchev, V.; Häfner, G.; Jolie, J.; Beckers, M.; Blazhev, A.; Dewald, A.; Fransen, C.; Goldkuhle, A.; Knafla, L.; Müller-Gatermann, C. Phys. Rev. C (2021) 103(5), p. 054324.
  • [ Abstract ]
  • [ DOI ]
  Lifetimes of low-spin excited states in 112Pd were measured using the recoil-distance Doppler-shift technique. The nucleus of interest was populated in a 110 Pd(18O,16O)112Pd reaction using the Cologne FN Tandem accelerator. Three lifetimes of ground-state band members and one lifetime of the γ band were measured. From these lifetimes reduced transition probabilities were extracted and compared to interacting boson model, γ-soft calculations, and Davydov calculations. The lifetime of the 2+γ gives some insights on the nuclear shape and structure of the γ band. The deduced transition rates show an indicator for a rigid triaxial nucleus as well as more indicators for a γ-soft nucleus.
• In search of nano-materials with enhanced secondary electron emission for radiation detectors. Cholewa, M;; Cappellazzo, M;; Ley, M;; Bittner, D;; Jolie, J;; Lee, K;; Song, M;; Yi, G;; Boutachkov, P;. Nature Scientific Reports (2021) 11(10517).
  • [ Abstract ]
  • [ DOI ]
  There has been limited research devoted to secondary electron emission (SEE) from nano-materials using rapid and heavy ion bombardment. Here we report a comparison of SEE properties between novel nano-materials with a three-dimensional nano-structure composed of a mostly regular pattern of rods and gold used as a standard material for SEE under bombardment of heavy ions at energies of a few MeV/nucleon. The nano-structured materials show enhanced SEE properties when compared with gold. Results from this work will enable the development of new radiation detectors for science and industry.
• Lifetimes and structures of low-lying negative-parity states of 209Po. Karayonchev, V.; Stoyanova, M.; Rainovski, G.; Jolie, J.; Blazhev, A.; Djongolov, M.; Esmaylzadeh, A.; Fransen, C.; Gladnishki, K.; Knafla, L.; Kocheva, D.; Kornwebel, L.; Régis, J.-M.; De Gregorio, G.; Gargano, A. Phys. Rev. C (2021) 103(4), p. 044309.
  • [ Abstract ]
  • [ DOI ]
  The 5/2−1, 9/2−1, and 11/2−1 states in 209Po were populated in the β decay of 209At and their lifetimes measured using the electronic γ−γ fast timing technique. The lifetime of the 9/2−1 state is measured for first time. The lifetime of the 5/2−1 is measured to be shorter than the value adopted in the literature while the lifetime of the 11/2−1 state agrees well with the previous measurement. In order to get deeper insight into the structure of the states, a shell-model calculation was carried out adopting a microscopic effective interaction derived from the realistic CD-Bonn potential. The comparison between theoretical and experimental data for the low-lying negative-parity states of 209Po supports the reliability of the predicted wave functions, which are found to be dominated by the coupling of a neutron hole to the yrast states of 210Po. However, it also points to the important role played by minor wave-function components in describing the reduced electromagnetic strengths, suggesting the need of additional configuration mixing for achieving a better quantitative agreement.
• Microscopic structure of the one-phonon 2+ states of 208Po. Kalaydjieva, D.; Kocheva, D.; Rainovski, G.; Karayonchev, V.; Jolie, J.; Pietralla, N.; Beckers, M.; Blazhev, A.; Dewald, A.; Djongolov, M.; Esmaylzadeh, A.; Fransen, C.; Gladnishki, K. A.; Goldkuhle, A.; Henrich, C.; Homm, I.; Ide, K. E.; John, P. R.; Kern, R.; Kleemann, J.; Kröll, Th.; Müller-Gatermann, C.; Scheck, M.; Spagnoletti, P.; Stoyanova, M.; Stoychev, K.; Werner, V.; Yaneva, A.; Dimitrova, S. S.; De Gregorio, G.; Naïdja, H.; Gargano, A. Phys. Rev. C (2021) 104(2), p. 024311.
  • [ Abstract ]
  • [ DOI ]
  The lifetimes of the 2+1 and 4+1 states of 208Po were measured in the α-transfer reaction 204Pb(12C,8Be)208Po by γ-ray spectroscopy utilizing the recoil distance Doppler shift method. The newly extracted transition strengths alongside ones of the decay of the 2+2 state were compared to the results of large-scale shell-model calculations using an effective interaction derived from the realistic CD-Bonn nucleon-nucleon potential. The comparison indicates the importance of the quadrupole isovector excitations in the valence shell for a fine tuning of the two-body matrix elements of the shell-model interaction.
• Lifetimes and structures of low-lying negative-parity states of 209Po. Karayonchev, V.; Stoyanova, M.; Rainovski, G.; Jolie, J.; Blazhev, A.; Djongolov, M.; Esmaylzadeh, A.; Fransen, C.; Gladnishki, K.; Knafla, L.; Kocheva, D.; Kornwebel, L.; Régis, J.-M.; De Gregorio, G.; Gargano, A. Phys. Rev. C (2021) 103(4), p. 044309.
  • [ DOI ]
• Lifetime measurements in 182Pt using γ–γ fast-timing. Häfner, G.; Esmaylzadeh, A.; Jolie, J.; Régis, J.-M.; Müller-Gatermann, C.; Blazhev, A.; Fransen, C.; Gerst, R.-B.; Karayonchev, V.; Knafla, L.; Saed-Samii, N.; Zell, K.-O. The European Physical Journal A (2021) 57(5), p. 174.
  • [ Abstract ]
  • [ DOI ]
  The level lifetimes of the 2+1 and 4+1 states in 182Pt have been re-measured employing the γ–γ fast-timing technique using fast LaBr3(Ce) scintillators. Excited states in the nucleus of interest were populated by the fusion-evaporation reaction 170Yb(16O,4n)182Pt at a beam energy of 87 MeV provided by the FN Tandem accelerator of the University of Cologne. The lifetime of the 2+1 state was re-measured with high accuracy to be τ=563(12) ps and resolves inconsistencies from previous measurements. Experimental results are compared to theoretical calculations in the framework of the sd-IBM with and without configuration mixing.
• Lifetime measurements to investigate γ softness and shape coexistence in 102Mo. Esmaylzadeh, A.; Karayonchev, V.; Nomura, K.; Jolie, J.; Beckers, M.; Blazhev, A.; Dewald, A.; Fransen, C.; Gerst, R.-B.; Häfner, G.; Harter, A.; Knafla, L.; Ley, M.; Robledo, L. M.; Rodríguez-Guzmán, R.; Rudigier, M. Phys. Rev. C (2021) 104(6), p. 064314.
  • [ Abstract ]
  • [ DOI ]
  Lifetimes of low-spin excited states in 102Mo populated in a 100Mo(18O,16O)102Mo two-neutron transfer reaction were measured using the recoil-distance Doppler-shift technique at the Cologne FN Tandem accelerator. Lifetimes of the 2+1, 4+1, 6+1, 0+2, 2+γ, 3+γ states and one upper limit for the lifetime of the 4+γ state were obtained. The energy levels and deduced electromagnetic transition probabilities are compared with those obtained within the mapped interacting boson model framework with microscopic input from Gogny mean-field calculations. With the newly obtained signatures a more detailed insight in the γ softness and shape coexistence in 102Mo is possible and discussed in the context of the Z≈40 and N≈60 region. The nucleus of 102Mo follows the γ soft trend of the Mo isotopes. The properties of the 0+2 state indicate, in contrast with the microscopic predictions, shape coexistence which also occurs in other N=60 isotones.
• First beta-decay spectroscopy of 135In and new beta-decay branches of 134In. Piersa-Siłkowska, M.; Korgul, A.; Benito, J.; Fraile, L. M.; Adamska, E.; Andreyev, A. N.; Álvarez-Rodríguez, R.; Barzakh, A. E.; Benzoni, G.; Berry, T.; Borge, M. J. G.; Carmona, M.; Chrysalidis, K.; Correia, J. G.; Costache, C.; Cubiss, J. G.; Day Goodacre, T.; De Witte, H.; Fedorov, D. V.; Fedosseev, V. N.; Fernández-Martínez, G.; Fijałkowska, A.; Fynbo, H.; Galaviz, D.; Galve, P.; García-Díez, M.; Greenlees, P. T.; Grzywacz, R.; Harkness-Brennan, L. J.; Henrich, C.; Huyse, M.; Ibáñez, P.; Illana, A.; Janas, Z.; Johnston, K.; Jolie, J.; Judson, D. S.; Karanyonchev, V.; Kicińska-Habior, M.; Konki, J.; Koszuk, Ł.; Kurcewicz, J.; Lazarus, I.; Lică, R.; López-Montes, A.; Mach, H.; Madurga, M.; Marroquín, I.; Marsh, B.; Martínez, M. C.; Mazzocchi, C.; Miernik, K.; Mihai, C.; Mărginean, N.; Mărginean, R.; Negret, A.; Nácher, E.; Ojala, J.; Olaizola, B.; Page, R. D.; Pakarinen, J.; Pascu, S.; Paulauskas, S. V.; Perea, A.; Pucknell, V.; Rahkila, P.; Raison, C.; Rapisarda, E.; Rezynkina, K.; Rotaru, F.; Rothe, S.; Rykaczewski, K. P.; Régis, J.-M.; Schomacker, K.; Siłkowski, M.; Simpson, G.; Sotty, C.; Stan, L.; Stănoiu, M.; Stryjczyk, M.; Sánchez-Parcerisa, D.; Sánchez-Tembleque, V.; Tengblad, O.; Turturică, A.; Udías, J. M.; Van Duppen, P.; Vedia, V.; Villa, A.; Viñals, S.; Wadsworth, R.; Walters, W. B.; Warr, N.; Wilkins, S. G. Phys. Rev. C (2021) 104(4), p. 044328.
  • [ DOI ]

• FATIMA — FAst TIMing Array for DESPEC at FAIR. Rudigier, M.; Podolyák, Zs.; Regan, P.H.; Bruce, A.M.; Lalkovski, S.; Canavan, R.L.; Gamba, E.R.; Roberts, O.; Burrows, I.; Cullen, D.M.; Fraile, L.M.; Gerhard, L.; Gerl, J.; Gorska, M.; Grant, A.; Jolie, J.; Karayonchev, V.; Kurz, N.; Korten, W.; Lazarus, I.H.; Nita, C.R.; Pucknell, V.F.E.; Régis, J.-M.; Schaffner, H.; Simpson, J.; Singh, P.; Townsley, C.M.; Smith, J.F.; Vesic, J. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment (2020) 969, p. 163967.
  • [ Abstract ]
  • [ DOI ]
  The components, working principle and characteristics of FATIMA (FAst TIMing Array), a fast-timing detector system for DESPEC at FAIR, are described. The core system includes 36 LaBr3(Ce) scintillator detectors, a mounting frame for the DESPEC station and a VME-based fast-timing data acquisition system. The current electronic timing circuit is based on V812 constant fraction discriminators and V1290 time-to-digital converters. Gamma-ray energies are measured using V1751 digitisers. Characteristics of the core FATIMA system including efficiency, energy, and coincidence resolving time, as well as limitations, are discussed on the basis of test measurements performed in the S4 cave at GSI, Germany. The coincidence γ-γ time resolution for the prompt 60Co cascade is determined to be ∼320 ps full width at half maximum. The total full energy peak efficiency at 1 MeV for the 36 detector array in the DESPEC setup is 2.9%. The energy-dependent prompt response centroid curve with the current CFD/TDC combination is shown to be smooth; the centroid shift method can be applied for the measurement of half-lives below 200 ps. An overview of applications of the FATIMA detectors as an ancilliary system in combination with other detector arrays during recent years is given. Data on the operation of the detectors in the presence of magnetic fields are presented.
• γ-γ fast timing at X-ray energies and investigation on various timing deviations. Régis, J.-M.; Esmaylzadeh, A.; Jolie, J.; Karayonchev, V.; Knafla, L.; Köster, U.; Kim, Y.H.; Strub, E. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment (2020) 955, p. 163258.
  • [ Abstract ]
  • [ DOI ]
  We report on systematic γ-γ fast-timing measurements by using four cylindrical 1.5′′×1.5′′ LaBr3(Ce) scintillator detectors which were installed in compact geometry around the focal plane of the Lohengrin fission-fragment separator at the Institut Laue–Langevin in Grenoble, France. Unconventional γ-ray sources as 185Os and 187W were produced by thermal-neutron activation to provide nearly prompt low-energy γ and K-X rays with average γ- and X-ray multiplicity equal to two. Due to practically no contribution of Compton background, highly precise results of time-walk measurements down to 40 keV are presented. Timing deviations related to different phenomena have been investigated, such as the geometry of an extended γ-ray source and the detector arrangement, long-term timing shifts and the timing contributions of the Compton background and the inter-detector Compton-scattering. The geometrical timing deviations are shown to be minimized using a multi-element detector array with a centrally symmetric arrangement relative to the center of the focal plane. Time-correction formula are proposed as analytical corrections for long-term time shifts, the time contributions of the Compton background and the position-dependent change of the time walk for cases where the calibration source cannot be placed at the center of the focal plane.
• FATIMA – FAst TIMing Array for DESPEC at FAIR. Rudigier, M.; Podolyák, Zs.; Regan, P.H.; Bruce, A.M.; Lalkovski, S.; Canavan, R.L.; Gamba, E.R.; Roberts, O.; Burrows, I.; Cullen, D.M.; Fraile, L.M.; Gerhard, L.; Gerl, J.; Gorska, M.; Grant, A.; Jolie, J.; Karayonchev, V.; Kurz, N.; Korten, W.; Lazarus, I.H. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment (2020).
• Lifetime measurements of 162Er: Evolution of collectivity in the rare-earth region. Knafla, L.; Häfner, G.; Jolie, J.; Régis, J.-M.; Karayonchev, V.; Blazhev, A.; Esmaylzadeh, A.; Fransen, C.; Goldkuhle, A.; Herb, S.; Müller-Gatermann, C.; Warr, N.; Zell, K. O. Phys. Rev. C (2020) 102(4), p. 044310.
  • [ DOI ]
• Multi-quasiparticle sub-nanosecond isomers in W-178. Rudigier, M.; Walker, P.M.; Canavan, R.L.; Podolyák, Zs.; Regan, P.H.; Söderström, P.-A.; Lebois, M.; Wilson, J.N.; Jovancevic, N.; Blazhev, A.; Benito, J.; Bottoni, S.; Brunet, M.; Cieplicka-Orynczak, N.; Courtin, S.; Doherty, D.T.; Fraile, L.M.; Hadynska-Klek, K.; Heine, M.; Iskra, Ł.W.; Jolie, J.; Karayonchev, V.; Kennington, A.; Koseoglou, P.; Lotay, G.; Lorusso, G.; Nakhostin, M.; Nita, C.R.; Oberstedt, S.; Qi, L.; Régis, J.-M.; Sánchez-Tembleque, V.; Shearman, R.; Witt, W.; Vedia, V.; Zell, K.O. Physics Letters B (2020) 801, p. 135140.
  • [ DOI ]
• Benchmarking the PreSPEC@GSI experiment for Coulex-multipolarimetry on the π(p3/2) --> π(p1/2) spin-flip transition in 85Br. Napiralla, P.; Lettmann, M.; Stahl, C.; Rainovski, G.; Pietralla, N.; Afara, S.; Ameil, F.; Arici, T.; Aydin, S.; Barrientos, D.; Bednarczyk, P.; Bentley, M. A.; Benzoni, G.; Birkenbach, B.; Blazhev, A.; Boston, A. J.; Boutachkov, P.; Bracco, A.; Bruyneel, B.; Clément, E.; Cortés, M. L.; Crespi, F. C. L.; Cullen, D. M.; Curien, D.; Désesquelles, P.; Didierjean, F.; Domingo-Pardo, C.; Duchêne, G.; Eberth, J.; Egger, H.; Fahlander, C.; Gerl, J.; Gladnishki, K. A.; Golubev, P.; González, V.; Górska, M.; Gottardo, A.; Grassi, L.; Habermann, T.; Harkness-Brennan, L. J.; Hess, H.; Jenkins, D. G.; John, P. R.; Jolie, J.; Judson, D. S.; Kojouharov, I.; Korten, W.; Labiche, M.; Lalovi’c}}}, N.; Lizarazo, C.; Louchart-Henning, C.; Maj, A.; Menegazzo, R.; Mengoni, D.; Merchan, E.; Million, B.; Möller, O.; Möller, T.; Moschner, K.; Modamio, V.; Napoli, D.; Singh, B. S. Nara; Podolyák, Zs.; Pietri, S.; Ralet, D.; Reese, M.; Reiter, P.; Rudolph, D.; Sanchis, E.; Sarmiento, L. G.; Schaffner, H.; Simpson, J.; Singh, P. P.; Valiente-Dobón, J. J.; Werner, V.; Wieland, O. The European Physical Journal A (2020) 56(5), p. 147.
  • [ Abstract ]
  • [ DOI ]
  A first performance test of the Coulomb excitation multipolarimetry (Coulex-multipolarimetry) method is presented. It is based on a {\\($}{\$\)}^{\{}85{\}}{backslashhbox \Br{\}}{backslash,backslashpi p\_{\{}3/2{\}{backslashrightarrow backslashpi p{\_}{\{}1/2{\}}{\\($}{\$\)}85Br\($\pi$\)p3/2{\textrightarrow}\($\pi$\)p1/2 spin-flip experiment performed as part of the PreSPEC-AGATA campaign at the GSI Helmholtzzentrum für Schwerionenforschung (GSI). Via determination of background levels around the expected {\\($}{\$\)}^{\{}85{\}}{backslashhbox {\{}Br{\}}{\\($}{\$\)}85Br excitations as well as measured {\\($}{\$\)}^{\{}197{\}{backslashhbox {\{}Au{\}}{\\($}{\$\)}197Au excitations, an upper limit for the M1 transition strength of the {\\($}{\$\)}1/2{\_1^-{backslashrightarrow 3/2\_{backslashtext {\{}g.s.{\}}^-{\\($}{\$\)}1/21-{textrightarrow3/2g.s.- transition in {\\($}{\$\)}^{\{}85{\}}{backslashhbox {\{}Br{\}}{\\($}{\$\)}85Br and a lower beam time limit for upcoming experimental campaigns utilizing Coulex-multipolarimetry have been inferred. The impact of the use of AGATA in its anticipated {\\($}{\$\)}1{backslashpi {\\($}{\$\)}1\($\pi$\) configuration on these estimates is deduced via Geant4 simulations.
• Half-life measurements in 164,166Dy using γ-γ fast-timing spectroscopy with the ν-Ball spectrometer. Canavan, R. L.; Rudigier, M.; Regan, P. H.; Lebois, M.; Wilson, J. N.; Jovancevic, N.; Söderström, P.-A.; Collins, S. M.; Thisse, D.; Benito, J.; Bottoni, S.; Brunet, M.; Cieplicka-Orynczak, N.; Courtin, S.; Doherty, D. T.; Fraile, L. M.; Hadynska-Klek, K.; Häfner, G.; Heine, M.; Iskra, L}. W.; Karayonchev, V.; Kennington, A.; Koseoglou, P.; Lotay, G.; Lorusso, G.; Nakhostin, M.; Nita, C. R.; Oberstedt, S.; Podolyák, Zs.; Qi, L.; Régis, J.-M.; Sánchez-Tembleque, V.; Shearman, R.; Vedia, V.; Witt, W. Phys. Rev. C (2020) 101(2), p. 024313.
  • [ DOI ]
• Tests of collectivity in 98Zr by absolute transition rates. Karayonchev, V.; Jolie, J.; Blazhev, A.; Dewald, A.; Esmaylzadeh, A.; Fransen, C.; Häfner, G.; Knafla, L.; Litzinger, J.; Müller-Gatermann, C.; Régis, J.-M.; Schomacker, K.; Vogt, A.; Warr, N.; Leviatan, A.; Gavrielov, N. Phys. Rev. C (2020) 102(6), p. 064314.
  • [ DOI ]
• Performing the differential decay curve method on γ-ray transitions with unresolved Doppler-shifted components. Barber, L.; Cullen, D.M.; Giles, M.M.; Singh, B.S. Nara; Mallaburn, M.J.; Beckers, M.; Blazhev, A.; Braunroth, T.; Dewald, A.; Fransen, C.; Goldkuhle, A.; Jolie, J.; Mammes, F.; Müller-Gatermann, C.; Wölk, D.; Zell, K.O. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment (2020) 950, p. 162965.
  • [ Abstract ]
  • [ DOI ]
  A new method of extracting the γ-ray intensities necessary to perform lifetime measurements using the differential decay curve method (DDCM) is presented in this work, the unresolved Doppler-shifted components method (UDCM). The UDCM allows for a DDCM analysis to be performed using a γ-ray transition for which the fully Doppler-shifted and degraded components are unresolvable in energy and so are detected as a single peak. This technique was used to measure the known lifetime of the yrast 21+ state in 50Mn with a depopulating transition that does not have resolvable fully Doppler-shifted and degraded components. The lifetime measured through applying the UDCM was consistent with the standard DDCM measurement of the 21+ state. Use of the UDCM allows for DDCM lifetime measurements to be made using transitions of smaller γ-ray energies, smaller recoil velocities and, in some cases, with a smaller uncertainty. In contrast to a standard DDCM analysis, a UDCM analysis is also independent of the widths of the fully Doppler-shifted and degraded components and as a result they do not need to be determined.
• Lifetime measurements in the odd-A nucleus 177Hf. Knafla, L.; Alexa, P.; Köster, U.; Thiamova, G.; Régis, J.-M.; Jolie, J.; Blanc, A.; Bruce, A. M.; Esmaylzadeh, A.; Fraile, L. M.; de France, G.; Häfner, G.; Ilieva, S.; Jentschel, M.; Karayonchev, V.; Korten, W.; Kröll, T.; Lalkovski, S.; Leoni, S.; Mach, H.; Marginean, N.; Mutti, P.; Pascovici, G.; Paziy, V.; Podolyák, Zs.; Regan, P. H.; Roberts, O. J.; Saed-Samii, N.; Simpson, G. S.; Smith, J. F.; Soldner, T.; Townsley, C.; Ur, C. A.; Urban, W.; Vancraeyenest, A.; Warr, N. Phys. Rev. C (2020) 102(5), p. 054322.
  • [ DOI ]
• Restoring the valence-shell stabilization in 140Nd. Kern, R.; Zidarova, R.; Pietralla, N.; Rainovski, G.; Stegmann, R.; Blazhev, A.; Boukhari, A.; Cederkäll, J.; Cubiss, J. G.; Djongolov, M.; Fransen, C.; Gaffney, L. P.; Gladnishki, K.; Giannopoulos, E.; Hess, H.; Jolie, J.; Karayonchev, V.; Kaya, L.; Keatings, J. M.; Kocheva, D.; Kröll, Th.; Möller, O.; O’Neill, G. G.; Pakarinen, J.; Reiter, P.; Rosiak, D.; Scheck, M.; Snall, J.; Söderström, P.-A.; Spagnoletti, P.; Stoyanova, M.; Thiel, S.; Vogt, A.; Warr, N.; Welker, A.; Werner, V.; Wiederhold, J.; De Witte, H. Phys. Rev. C (2020) 102(4), p. 041304.
  • [ DOI ]
• Prompt and delayed gamma spectroscopy of neutron-rich 94Kr and observation of a new isomer. Gerst, R.-B.; Blazhev, A.; Warr, N.; Wilson, J. N.; Lebois, M.; Jovančević, N.; Thisse, D.; Canavan, R.; Rudigier, M.; Étasse, D.; Adamska, E.; Adsley, P.; Algora, A.; Babo, M.; Belvedere, K.; Benito, J.; Benzoni, G.; Boso, A.; Bottoni, S.; Bunce, M.; Chakma, R.; Cieplicka-Oryńczak, N.; Courtin, S.; Cortés, M. L.; Davies, P.; Delafosse, C.; Fallot, M.; Fornal, B.; Fraile, L. M.; Gjestvang, D.; Gottardo, A.; Guadilla, V.; Häfner, G.; Hauschild, K.; Heine, M.; Henrich, C.; Homm, I.; Ibrahim, F.; Iskra, L. W.; Ivanov, P.; Jazrawi, S.; Korgul, A.; Koseoglou, P.; Kröll, T.; Kurtukian-Nieto, T.; Le Meur, L.; Leoni, S.; Ljungvall, J.; Lopez-Martens, A.; Lozeva, R.; Matea, I.; Miernik, K.; Nemer, J.; Oberstedt, S.; Paulsen, W.; Piersa, M.; Popovitch, Y.; Porzio, C.; Qi, L.; Ralet, D.; Regan, P. H.; Reygadas-Tello, D.; Rezynkina, K.; Sánchez-Tembleque, V.; Schmitt, C.; Söderström, P.-A.; Sürder, C.; Tocabens, G.; Vedia, V.; Verney, D.; Wasilewska, B.; Wiederhold, J.; Yavachova, M.; Zeiser, F.; Ziliani, S. Phys. Rev. C (2020) 102(6), p. 064323.
  • [ DOI ]
• Evolution of collectivity in 118Xe. Müller-Gatermann, C.; Dewald, A.; Fransen, C.; Beckers, M.; Blazhev, A.; Braunroth, T.; Goldkuhle, A.; Jolie, J.; Kornwebel, L.; Reviol, W.; von Spee, F.; Zell, K. O. Phys. Rev. C (2020) 102(6), p. 064318.
  • [ DOI ]
• Fast-timing study of 81Ga from the β decay of 81Zn. Paziy, V.; Fraile, L. M.; Mach, H.; Olaizola, B.; Simpson, G. S.; Aprahamian, A.; Bernards, C.; Briz, J. A.; Bucher, B.; Chiara, C. J.; Dlouhý, Z.; Gheorghe, I.; Ghiţǎ, D.; Hoff, P.; Jolie, J.; Köster, U.; Kurcewicz, W.; Licǎ, R.; Mǎrginean, N.; Mǎrginean, R.; Régis, J. M.; Rudigier, M.; Sava, T.; Stǎnoiu, M.; Stroe, L.; Walters, W. B. Phys. Rev. C (2020) 102(1), p. 014329.
  • [ Abstract ]
  • [ DOI ]
  The β− decay of 81Zn to the neutron magic N = 50 nucleus 81Ga, with only three valence protons with respect to 78Ni, was investigated. The study was performed at the ISOLDE facility at CERN by means of γ spectroscopy. The 81Zn half-life was determined to be T1/2 = 290(4) ms while the β-delayed neutron emission probability was measured as Pn = 23(4)%. The analysis of the β-gated γ -ray singles and γ -γ coincidences from the decay of 81Zn provides 47 new levels and 70 new transitions in 81Ga. The β−n decay of 81Zn was observed and a new decay scheme into the odd-odd 80Ga nucleus was established. The half-lives of the first and second excited states of 81Ga were measured via the fast-timing method using LaBr3(Ce) detectors. The level scheme and transition rates are compared to large-scale shell-model calculations. The low-lying structure of 81Ga is interpreted in terms of the coupling of the three valence protons outside the doubly magic 78Ni core.
• Experimental evidence for low-lying quadrupole isovector excitation of 208Po. Yaneva, A.; Kocheva, D.; Rainovski, G.; Jolie, J.; Pietralla, N.; Blazhev, A.; Dewald, A.; Djongolov, M.; Fransen, C.; Gladnishki, K. A.; Henrich, C.; Homm, I.; Ide, K. E.; John, P. R.; Kalaydjieva, D.; Karayonchev, V.; Kern, R.; Kleemann, J.; Kröll, Th.; Müller-Gatermann, C.; Scheck, M.; Spagnoletti, P.; Stoyanova, M.; Werner, V. The European Physical Journal A (2020) 56(246), p. 7.
  • [ Abstract ]
  • [ DOI ]
  We present the results from an experiment dedicated to measure the lifetime of the 22+ state, candidate for the one-phonon mixed-symmetry state, of 208Po. This nucleus was studied in the α-transfer reaction 204Pb(12C,8Be)208Po and the lifetime of the 22+ state was determined by utilizing the Doppler-shift attenuation method. The experimental data show that the 22+ state decays with a sizable M1 transition to the 21+ state revealing its isovector nature.
• Low-Z boundary of the N=88-90 shape phase transition: Ce-148 near the critical point. Koseoglou, P.; Werner, V.; Pietralla, N.; Ilieva, S.; Nikšić, T.; Vretenar, D.; Alexa, P.; Thürauf, M.; Bernards, C.; Blanc, A.; Bruce, A. M.; Cakirli, R. B.; Cooper, N.; Fraile, L. M.; de France, G.; Jentschel, M.; Jolie, J.; Köster, U.; Korten, W.; Kröll, T.; Lalkovski, S.; Mach, H.; Mărginean, N.; Mutti, P.; Patel, Z.; Paziy, V.; Podolyák, Zs.; Regan, P. H.; Régis, J.-M.; Roberts, O. J.; Saed-Samii, N.; Simpson, G. S.; Soldner, T.; Ur, C. A.; Urban, W.; Wilmsen, D.; Wilson, E. Phys. Rev. C (2020) 101(1), p. 014303.
  • [ DOI ]

• A new dedicated plunger device for the GALILEO γ-ray detector array. Müller-Gatermann, C.; von Spee, F.; Goasduff, A.; Bazzacco, D.; Beckers, M.; Braunroth, T.; Boso, A.; Cocconi, P.; de Angelis, G.; Dewald, A.; Fransen, C.; Goldkuhle, A.; Gottardo, A.; Gozzelino, A.; Hadyńska-Klęk, K.; Jawroski, G.; John, P.R.; Jolie, J.; Lenzi, S.M.; Litzinger, J.; Menegazzo, R.; Mengoni, D.; Napoli, D.R.; Recchia, F.; Siciliano, M.; Testov, D.; Thiel, S.; Valiente-Dobón, J.J.; Zell, K.O. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment (2019) 920, pp. 95–99.
  • [ DOI ]
• Optimization and characterization of the PGAI-NT instrument’s Neutron Tomography set-up at MLZ. Kluge, E. J.; Stieghorst, C.; Revay, Zs.; Kudejova, P.; Jolie, J. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment (2019) 932, pp. 1–15.
  • [ Abstract ]
  • [ DOI ]
  The Prompt Gamma-ray Activation Imaging and Neutron Tomography (PGAI-NT) instrument at the PGAA facility of the Heinz Maier-Leibnitz Center (MLZ), provides a method to obtain and effectively visualize position-sensitive element abundances in samples by combining a three-dimensional extension of Prompt Gamma-ray Activation Analysis (PGAA) and Neutron Tomography (NT). Inspired by a proof-of-principle study, a cone-beam tomography set-up was designed, tested and installed. This article reports on the design of the new cone-beam tomography set-up and its optimization using neutron beam simulations and physical measurements. A new position-sensitive neutron detector with improved performance and instrument environment integration was designed, built and tested. The overall NT performance of the set-up is investigated in the course of a Quality Assessment for neutron tomography sites. Its stand-alone NT and all-in-one PGAI-NT suitability is determined.
• Isomer spectroscopy in ¹³³Ba and high-spin structure of ¹³⁴Ba. Kaya, L.; Vogt, A.; Reiter, P.; Siciliano, M.; Shimizu, N.; Utsuno, Y.; Wang, H.-K.; Gargano, A.; Coraggio, L.; Itaco, N.; Arnswald, K.; Bazzacco, D.; Birkenbach, B.; Blazhev, A.; Bracco, A.; Bruyneel, B.; Corradi, L.; Crespi, F. C. L.; de Angelis, G.; Droste, M.; Eberth, J.; Esmaylzadeh, A.; Farnea, E.; Fioretto, E.; Fransen, C.; Gadea, A.; Giaz, A.; Görgen, A.; Gottardo, A.; Hadyńska-Klęk, K.; Hess, H.; Hirsch, R.; John, P. R.; Jolie, J.; Jungclaus, A.; Karayonchev, V.; Kornwebel, L.; Korten, W.; Leoni, S.; Lewandowski, L.; Lunardi, S.; Menegazzo, R.; Mengoni, D.; Michelagnoli, C.; Mijatović, T.; Montagnoli, G.; Montanari, D.; Müller-Gatermann, C.; Napoli, D.; Podolyák, Zs.; Pollarolo, G.; Recchia, F.; Régis, J.-M.; Saed-Samii, N.; Şahin, E.; Scarlassara, F.; Schomacker, K.; Seidlitz, M.; Siebeck, B.; Söderström, P.-A.; Stefanini, A. M.; Stezowski, O.; Szilner, S.; Szpak, B.; Teruya, E.; Ur, C.; Valiente-Dobón, J. J.; Wolf, K.; Yanase, K.; Yoshinaga, N.; Zell, K. O. Phys. Rev. C (2019) 100(2), p. 024323.
  • [ DOI ]
• Lifetimes and shape-coexisting states of 99Zr. Spagnoletti, P.; Simpson, G.; Kisyov, S.; Bucurescu, D.; Régis, J.-M.; Saed-Samii, N.; Blanc, A.; Jentschel, M.; Köster, U.; Mutti, P.; Soldner, T.; de France, G.; Ur, C. A.; Urban, W.; Bruce, A. M.; Bernards, C.; Drouet, F.; Fraile, L. M.; Gaffney, L. P.; Ghitifmmode ua}else \ua}\fi{}, D. G.; Ilieva, S.; Jolie, J.; Korten, W.; Kröll, T.; Lalkovski, S.; Larijarni, C.; Licifmmode ua}else \ua}\fi{}, R.; Mach, H.; Mifmmode ua}else \ua}\fi{}rginean, N.; Paziy, V.; Podolyák, Zs.; Regan, P. H.; Scheck, M.; Smith, J. F.; Thiamova, G.; Townsley, C.; Vancraeyenest, A.; Vedia, V.; Warr, N.; Werner, V.; Zieliifmmode \acute{n}else ń\fi{}ska, M. Phys. Rev. C (2019) 100(1), p. 014311.
  • [ DOI ]
• Lifetimes of the \(${4}_{1}^{+}$\) states of 206Po and 204Po: A study of the transition from noncollective seniority-like mode to collectivity. Stoyanova, M.; Rainovski, G.; Jolie, J.; Pietralla, N.; Blazhev, A.; Beckers, M.; Dewald, A.; Djongolov, M.; Esmaylzadeh, A.; Fransen, C.; Gerhard, L. M.; Gladnishki, K. A.; Herb, S.; John, P. R.; Karayonchev, V.; Keatings, J. M.; Kern, R.; Knafla, L.; Kocheva, D.; Kornwebel, L.; Kröll, Th.; Ley, M.; Mashtakov, K. M.; Müller-Gatermann, C.; Régis, J.-M.; Scheck, M.; Schomacker, K.; Sinclair, J.; Spagnoletti, P.; Sürder, C.; Warr, N.; Werner, V.; Wiederhold, J. Phys. Rev. C (2019) 100(6), p. 064304.
  • [ DOI ]
• Evolution of E2 strength in the rare-earth isotopes ¹⁷⁴⁻¹⁷⁶⁻¹⁷⁸⁻¹⁸⁰Hf. Wiederhold, J.; Werner, V.; Kern, R.; Pietralla, N.; Bucurescu, D.; Carroll, R.; Cooper, N.; Daniel, T.; Filipescu, D.; Florea, N.; Gerst, R-B.; Ghita, D.; Gurgi, L.; Jolie, J.; Ilieva, R. S.; Lica, R.; Marginean, N.; Marginean, R.; Mihai, C.; Mitu, I. O.; Naqvi, F.; Nita, C.; Rudigier, M.; Stegemann, S.; Pascu, S.; Regan, P. H. Phys. Rev. C (2019) 99(2), p. 024316.
  • [ DOI ]
• Beta decay of 133In: gamma emission from neutron-unbound states in 133Sn. Piersa, M.; Korgul, A.; Fraile, L. M.; Benito, J.; Adamska, E.; Andreyev, A. N.; Álvarez-Rodr’i}guez, R.; Barzakh, A. E.; Benzoni, G.; Berry, T.; Borge, M. J. G.; Carmona, M.; Chrysalidis, K.; Correia, J. G.; Costache, C.; Cubiss, J. G.; Day Goodacre, T.; De Witte, H.; Fedorov, D. V.; Fedosseev, V. N.; Fernández-Mart’i}nez, G.; Fijal}kowska, A.; Fila, M.; Fynbo, H.; Galaviz, D.; Greenlees, P. T.; Grzywacz, R.; Harkness-Brennan, L. J.; Henrich, C.; Huyse, M.; Illana, A.; Janas, Z.; Johnston, K.; Judson, D. S.; Karanyonchev, V.; Kiciifmmode \acute{n}else ń\fi{}ska Habior, M.; Konki, J.; Kurcewicz, J.; Lazarus, I.; Licifmmode ua}else \ua}\fi{}, R.; Mach, H.; Madurga, M.; Marroqu’i}n, I.; Marsh, B.; Mart’i}nez, M. C.; Mazzocchi, C.; Mifmmode ua}else \ua}\fi{}rginean, N.; Mifmmode ua}else \ua}\fi{}rginean, R.; Miernik, K.; Mihai, C.; Nácher, E.; Negret, A.; Olaizola, B.; Page, R. D.; Paulaskalas, S.; Pascu, S.; Perea, A.; Pucknell, V.; Rahkila, P.; Rapisarda, E.; Régis, J.-M.; Rotaru, F.; Rothe, S.; Sánchez-Tembleque, V.; Simpson, G.; Sotty, Ch.; Stan, L.; Stifmmode ua}else \ua}\fi{}noiu, M.; Stryjczyk, M.; Tengblad, O.; Turturica, A.; Ud’i}as, J. M.; Van Duppen, P.; Vedia, V.; Villa, A.; Vi nals, S.; Wadsworth, R.; Walters, W. B.; Warr, N. Phys. Rev. C (2019) 99(2), p. 024304.
  • [ DOI ]
• Low-lying octupole isovector excitation in ¹⁴⁴Nd. Thürauf, M.; Stoyanov, Ch.; Scheck, M.; Jentschel, M.; Bernards, C.; Blanc, A.; Cooper, N.; De France, G.; Gregor, E. T.; Henrich, C.; Hicks, S. F.; Jolie, J.; Kaleja, O.; Köster, U.; Kröll, T.; Leguillon, R.; Mutti, P.; O’Donnell, D.; Petrache, C. M.; Simpson, G. S.; Smith, J. F.; Soldner, T.; Tezgel, M.; Urban, W.; Vanhoy, J.; Werner, M.; Werner, V.; Zell, K. O.; Zerrouki, T. Phys. Rev. C (2019) 99(1), p. 011304.
  • [ DOI ]
• Collectivity of the 2p-2h proton intruder band of ¹¹⁶Sn. Petrache, C. M.; Régis, J.-M.; Andreoiu, C.; Spieker, M.; Michelagnoli, C.; Garrett, P. E.; Astier, A.; Dupont, E.; Garcia, F.; Guo, S.; Häfner, G.; Jolie, J.; Kandzia, F.; Karayonchev, V.; Kim, Y.-H.; Knafla, L.; Köster, U.; Lv, B. F.; Marginean, N.; Mihai, C.; Mutti, P.; Ortner, K.; Porzio, C.; Prill, S.; Saed-Samii, N.; Urban, W.; Vanhoy, J. R.; Whitmore, K.; Wisniewski, J.; Yates, S. W. Phys. Rev. C (2019) 99(2), p. 024303.
  • [ DOI ]
• Identification of high-spin proton configurations in ¹³⁶Ba and ¹³⁷Ba. Kaya, L.; Vogt, A.; Reiter, P.; Müller-Gatermann, C.; Gargano, A.; Coraggio, L.; Itaco, N.; Blazhev, A.; Arnswald, K.; Bazzacco, D.; Birkenbach, B.; Bracco, A.; Bruyneel, B.; Corradi, L.; Crespi, F. C. L.; de Angelis, G.; Droste, M.; Eberth, J.; Farnea, E.; Fioretto, E.; Fransen, C.; Gadea, A.; Giaz, A.; Görgen, A.; Gottardo, A.; Hadyńska-Klęk, K.; Hess, H.; Hetzenegger, R.; Hirsch, R.; John, P. R.; Jolie, J.; Jungclaus, A.; Korten, W.; Leoni, S.; Lewandowski, L.; Lunardi, S.; Menegazzo, R.; Mengoni, D.; Michelagnoli, C.; Mijatović, T.; Montagnoli, G.; Montanari, D.; Napoli, D.; Podolyák, Zs.; Pollarolo, G.; Recchia, F.; Rosiak, D.; Saed-Samii, N.; Şahin, E.; Siciliano, M.; Scarlassara, F.; Seidlitz, M.; Söderström, P.-A.; Stefanini, A. M.; Stezowski, O.; Szilner, S.; Szpak, B.; Ur, C.; Valiente-Dobón, J. J.; Weinert, M.; Wolf, K.; Zell, K. O. Phys. Rev. C (2019) 99(1), p. 014301.
  • [ DOI ]
• Normal and intruder configurations in 34Si populated in the beta-decay of 34Mg and 34Al. Lica, R.; Rotaru, F.; Borge, M. J. G.; Grévy, S.; Negoita, F.; Poves, A.; Sorlin, O.; Andreyev, A. N.; Borcea, R.; Costache, C.; De Witte, H.; Fraile, L. M.; Greenlees, P. T.; Huyse, M.; Ionescu, A.; Kisyov, S.; Konki, J.; Lazarus, I.; Madurga, M.; Mifmmode ua}else \ua}\fi{}rginean, N.; Mifmmode ua}else \ua}\fi{}rginean, R.; Mihai, C.; Mihai, R. E.; Negret, A.; Nowacki, F.; Page, R. D.; Pakarinen, J.; Pucknell, V.; Rahkila, P.; Rapisarda, E.; ifmmode mboxŞelse \cS}\fi{}erban, A.; Sotty, C. O.; Stan, L.; Stifmmode ua}else \ua}\fi{}noiu, M.; Tengblad, O.; Turturicifmmode ua}else \ua}\fi{}, A.; Van Duppen, P.; Warr, N.; Dessagne, Ph.; Stora, T.; Borcea, C.; Cifmmode ua}else \ua}\fi{}linescu, S.; Daugas, J. M.; Filipescu, D.; Kuti, I.; Franchoo, S.; Gheorghe, I.; Morfouace, P.; Morel, P.; Mrazek, J.; Pietreanu, D.; Sohler, D.; Stefan, I.; ifmmode mboxŞelse \cS}\fi{}uvifmmode ua}else \ua}\fi{}ilifmmode ua}else \ua}\fi{}, R.; Toma, S.; Ur, C. A. Phys. Rev. C (2019) 100(3), p. 034306.
  • [ DOI ]
• Shape coexistence in 178Hg. Müller-Gatermann, C.; Dewald, A.; Fransen, C.; Auranen, K.; Badran, H.; Beckers, M.; Blazhev, A.; Braunroth, T.; Cullen, D. M.; Fruet, G.; Goldkuhle, A.; Grahn, T.; Greenlees, P. T.; Herzáifmmode \check{n}else \vn}\fi{}, A.; Jakobsson, U.; Jenkins, D.; Jolie, J.; Julin, R.; Juutinen, S.; Konki, J.; Leino, M.; Litzinger, J.; Nomura, K.; Pakarinen, J.; Peura, P.; Procter, M. G.; Rahkila, P.; Ruotsalainen, P.; Sandzelius, M.; Sarén, J.; Scholey, C.; Sorri, J.; Stolze, S.; Taylor, M. J.; Uusitalo, J.; Zell, K. O. Phys. Rev. C (2019) 99(5), p. 054325.
  • [ DOI ]
• Decay properties of the 3⁻₁ level in ⁹⁶Mo. Gregor, E T; Arsenyev, N N; Scheck, M; Shneidman, T M; Thürauf, M; Bernards, C; Blanc, A; Chapman, R; Drouet, F; Dzhioev, A A; de France, G; Jentschel, M; Jolie, J; Keatings, J M; Kröll, Th; Köster, U; Leguillon, R; Mashtakov, K R; Mutti, P; O’Donnell, D; Petrache, C M; Simpson, G S; Sinclair, J; Smith, J F; Soldner, T; Spagnoletti, P; Sushkov, A V; Urban, W; Vancraeyenest, A; Vanhoy, J R; Werner, V; Zell, K O; Zielinska, M. Journal of Physics G: Nuclear and Particle Physics (2019) 46(7), p. 075101.
  • [ DOI ]
• Probing isospin symmetry in the (⁵⁰Fe, ⁵⁰Mn, ⁵⁰Cr) isobaric triplet via electromagnetic transition rates. Giles, M. M.; Nara Singh, B. S.; Barber, L.; Cullen, D. M.; Mallaburn, M. J.; Beckers, M.; Blazhev, A.; Braunroth, T.; Dewald, A.; Fransen, C.; Goldkuhle, A.; Jolie, J.; Mammes, F.; Müller-Gatermann, C.; Wölk, D.; Zell, K. O.; Lenzi, S. M.; Poves, A. Phys. Rev. C (2019) 99(4), p. 044317.
  • [ DOI ]
• Properties of \($\ensuremath{\gamma}$\)-decaying isomers in the \($^{100}\mathrm{Sn}$\) region populated in fragmentation of a \($^{124}\mathrm{Xe}$\) beam. Häfner, G.; Moschner, K.; Blazhev, A.; Boutachkov, P.; Davies, P. J.; Wadsworth, R.; Ameil, F.; Baba, H.; Bäck, T.; Dewald, M.; Doornenbal, P.; Faestermann, T.; Gengelbach, A.; Gerl, J.; Gernhäuser, R.; Go, S.; Górska, M.; Grawe, H.; Gregor, E.; Hotaka, H.; Isobe, T.; Jenkins, D. G.; Jolie, J.; Jung, H. S.; Kojouharov, I.; Kurz, N.; Lewitowicz, M.; Lorusso, G.; Lozeva, R.; Merchan, E.; Naqvi, F.; Nishibata, H.; Nishimura, D.; Nishimura, S.; Pietralla, N.; Schaffner, H.; Söderström, P.-A.; Steiger, K.; Sumikama, T.; Taprogge, J.; Thöle, P.; Watanbe, H.; Warr, N.; Werner, V.; Xu, Z. Y.; Yagi, A.; Yoshinaga, K.; Zhu, Y. Phys. Rev. C (2019) 100(2), p. 024302.
  • [ DOI ]
• Lifetime of the 15/2⁻₁ state in ¹³⁵Te. Simpson, G; Regis, J M; Bettermann, L; Genevey, J; Jolie, J; Köster, U; Materna, T; Malkiewicz, T; Muraz, J-F; Pinston, J A; Roussiere, B; Thiamova, G. Journal of Physics G: Nuclear and Particle Physics (2019) 46(6), p. 065108.
  • [ Abstract ]
  • [ DOI ]
  The lifetime of the state of 135Te has been measured to be τ = 809(22) ps, corresponding to a reduced transition rate of  =6.6(2) W.u. The experiment was performed at the focal point of the Lohengrin spectrometer and μs-delayed γ rays from mass-selected A = 135 ions were detected by four LaBr3(Ce) scintillators. This allowed the fast-timing technique to be used to access lifetimes in the 10s-of-ps to ns time region. The value is typical of a vibrational transition, despite 135Te possessing only one valence neutron and two valence protons. Shell model calculations performed with the state-of-the-art effective interaction predict a B(E2) value close to the experimental one and show that contributions from the π(g 7/2, d 5/2)νf 7/2 couplings are coherent.
• Investigation of the Δn = 0 selection rule in Gamow-Teller transitions: The β-decay of 207Hg. Berry, T.A.; Podolyák, Zs.; Carroll, R.J.; Lică, R.; Grawe, H.; Timofeyuk, N.K.; Alexander, T.; Andreyev, A.N.; Ansari, S.; Borge, M.J.G.; Creswell, J.; Fahlander, C.; Fraile, L.M.; Fynbo, H.O.U.; Gelletly, W.; Gerst, R.-B.; Górska, M.; Gredley, A.; Greenlees, P.; Harkness-Brennan, L.J.; Huyse, M.; Judge, S.M.; Judson, D.S.; Konki, J.; Kurcewicz, J.; Kuti, I.; Lalkovski, S.; Lazarus, I.; Lund, M.; Madurga, M.; Mărginean, N.; Mărginean, R.; Marroquin, I.; Mihai, C.; Mihai, R.E.; Nácher, E.; Nae, S.; Negret, A.; Niţă, C.; Page, R.D.; Pascu, S.; Patel, Z.; Perea, A.; Pucknell, V.; Rahkila, P.; Rapisarda, E.; Regan, P.H.; Rotaru, F.; Shand, C.M.; Simpson, E.C.; Sotty, Ch.; Stegemann, S.; Stora, T.; Tengblad, O.; Turturica, A.; Duppen, P. Van; Vedia, V.; Wadsworth, R.; Walker, P.M.; Warr, N.; Wearing, F.; Witte, H. De. Physics Letters B (2019) 793, pp. 271–275.
  • [ Abstract ]
  • [ DOI ]
  Gamow-Teller β decay is forbidden if the number of nodes in the radial wave functions of the initial and final states is different. This Δn=0 requirement plays a major role in the β decay of heavy neutron-rich nuclei, affecting the nucleosynthesis through the increased half-lives of nuclei on the astrophysical r-process pathway below both Z=50 (for N>82) and Z=82 (for N>126). The level of forbiddenness of the Δn=1ν1g9/2→π0g7/2 transition has been investigated from the β− decay of the ground state of 207Hg into the single-proton-hole nucleus 207Tl in an experiment at the ISOLDE Decay Station. From statistical observational limits on possible γ-ray transitions depopulating the π0g7/2−1 state in 207Tl, an upper limit of 3.9×10−3% was obtained for the probability of this decay, corresponding to log⁡ft>8.8 within a 95% confidence limit. This is the most stringent test of the Δn=0 selection rule to date.
• Multiple Shape Coexistence in 110,112Cd. Garrett, P. E.; Rodríguez, T. R.; Varela, A. Diaz; Green, K. L.; Bangay, J.; Finlay, A.; Austin, R. A. E.; Ball, G. C.; Bandyopadhyay, D. S.; Bildstein, V.; Colosimo, S.; Cross, D. S.; Demand, G. A.; Finlay, P.; Garnsworthy, A. B.; Grinyer, G. F.; Hackman, G.; Jigmeddorj, B.; Jolie, J.; Kulp, W. D.; Leach, K. G.; Morton, A. C.; Orce, J. N.; Pearson, C. J.; Phillips, A. A.; Radich, A. J.; Rand, E. T.; Schumaker, M. A.; Svensson, C. E.; Sumithrarachchi, C.; Triambak, S.; Warr, N.; Wong, J.; Wood, J. L.; Yates, S. W. Phys. Rev. Lett. (2019) 123(14), p. 142502.
  • [ DOI ]
• Lifetime measurement of excited states in ⁴⁶Ti. Goldkuhle, A.; Fransen, C.; Dewald, A.; Arnswald, K.; Bast, M.; Beckers, M.; Blazhev, A.; Braunroth, T.; Hackenberg, G.; Häfner, G.; Litzinger, J.; Jolie, J.; Müller-Gatermann, C.; von Spee, F.; Warr, N.; Werner, D.; Zell, K. O. The European Physical Journal A (2019) 55(4), p. 53.
  • [ Abstract ]
  • [ DOI ]
  The level lifetimes of the yrast 21+, 41+ and 61+ states and an upper limit of the lifetime of the 81+ state in 46Ti have been measured with high accuracy exploiting the recoil distance Doppler-shift method (RDDS) and using {\\($}{\backslash}gamma{\backslash}gamma{\$\)}\($\gamma$\)\($\gamma$\)coincidences. The nuclei were populated by the fusion evaporation reaction 40Ca(9Be, 2p1n)46Ti at a beam energy of {\\($}E=33{\$\)E=33MeV at the FN tandem accelerator of the University of Cologne, Germany. Lifetimes were extracted using the established differential decay curve method (DDCM).
• New lifetime measurements for the lowest quadrupole states in 20,22Ne and possible explanations of the high collectivity of the depopulating E2 transitions. Petkov, P.; Müller-Gatermann, C.; Werner, D.; Dewald, A.; Blazhev, A.; Fransen, C.; Jolie, J.; Ohkubo, S.; Zell, K. O. Phys. Rev. C (2019) 100(2), p. 024312.
  • [ DOI ]
• Toward the limit of nuclear binding on the N=Z line: Spectroscopy of ⁹⁶Cd. Davies, P. J.; Park, J.; Grawe, H.; Wadsworth, R.; Gernhäuser, R.; Krücken, R.; Nowacki, F.; Ahn, D. S.; Ameil, F.; Baba, H.; Bäck, T.; Blank, B.; Blazhev, A.; Boutachkov, P.; Browne, F.; Čeliković, I.; Dewald, M.; Doornenbal, P.; Faestermann, T.; Fang, Y.; de France, G.; Fukuda, N.; Gengelbach, A.; Gerl, J.; Giovinazzo, J.; Go, S.; Goel, N.; Górska, M.; Gregor, E.; Hotaka, H.; Ilieva, S.; Inabe, N.; Isobe, T.; Jenkins, D. G.; Jolie, J.; Jung, H. S.; Jungclaus, A.; Kameda, D.; Kim, G. D.; Kim, Y.-K.; Kojouharov, I.; Kubo, T.; Kurz, N.; Lewitowicz, M.; Lorusso, G.; Lubos, D.; Maier, L.; Merchan, E.; Moschner, K.; Murai, D.; Naqvi, F.; Nishibata, H.; Nishimura, D.; Nishimura, S.; Nishizuka, I.; Patel, Z.; Pietralla, N.; Rajabali, M. M.; Rice, S.; Sakurai, H.; Schaffner, H.; Shimizu, Y.; Sinclair, L. F.; Söderström, P.-A.; Steiger, K.; Sumikama, T.; Suzuki, H.; Takeda, H.; Taprogge, J.; Thöle, P.; Valder, S.; Wang, Z.; Warr, N.; Watanabe, H.; Werner, V.; Wu, J.; Xu, Z. Y.; Yagi, A.; Yoshinaga, K.; Zhu, Y. Phys. Rev. C (2019) 99(2), p. 021302.
  • [ DOI ]
• Lifetimes in ²¹¹At and their implications for the nuclear structure above ²⁰⁸Pb. Karayonchev, V.; Blazhev, A.; Esmaylzadeh, A.; Jolie, J.; Dannhoff, M.; Diel, F.; Dunkel, F.; Fransen, C.; Gerhard, L. M.; Gerst, R.-B.; Knafla, L.; Kornwebel, L.; Müller-Gatermann, C.; Régis, J.-M.; Warr, N.; Zell, K. O.; Stoyanova, M.; Van Isacker, P. Phys. Rev. C (2019) 99(2), p. 024326.
  • [ DOI ]
• Lifetime measurements in 52,54Ti to study shell evolution toward N=32. Goldkuhle, A.; Fransen, C.; Blazhev, A.; Beckers, M.; Birkenbach, B.; Braunroth, T.; Clément, E.; Dewald, A.; Dudouet, J.; Eberth, J.; Hess, H.; Jacquot, B.; Jolie, J.; Kim, Y.-H.; Lemasson, A.; Lenzi, S. M.; Li, H. J.; Litzinger, J.; Michelagnoli, C.; Müller-Gatermann, C.; Nara Singh, B. S.; Pérez-Vidal, R. M.; Ralet, D.; Reiter, P.; Vogt, A.; Warr, N.; Zell, K. O.; Ataç, A.; Barrientos, D.; Barthe-Dejean, C.; Benzoni, G.; Boston, A. J.; Boston, H. C.; Bourgault, P.; Burrows, I.; Cacitti, J.; Cederwall, B.; Ciemala, M.; Cullen, D. M.; De France, G.; Domingo-Pardo, C.; Foucher, J.-L.; Fremont, G.; Gadea, A.; Gangnant, P.; González, V.; Goupil, J.; Henrich, C.; Houarner, C.; Jean, M.; Judson, D. S.; Korichi, A.; Korten, W.; Labiche, M.; Lefevre, A.; Legeard, L.; Legruel, F.; Leoni, S.; Ljungvall, J.; Maj, A.; Maugeais, C.; Ménager, L.; Ménard, N.; Menegazzo, R.; Mengoni, D.; Million, B.; Munoz, H.; Napoli, D. R.; Navin, A.; Nyberg, J.; Ozille, M.; Podolyak, Zs.; Pullia, A.; Raine, B.; Recchia, F.; Ropert, J.; Saillant, F.; Salsac, M. D.; Sanchis, E.; Schmitt, C.; Simpson, J.; Spitaels, C.; Stezowski, O.; Theisen, Ch.; Toulemonde, M.; Tripon, M.; Valiente Dobón, J.-J.; Voltolini, G.; Zielińska, M. Phys. Rev. C (2019) 100(5), p. 054317.
  • [ DOI ]
• High-resolution study of the Gamow-Teller (GT-) strength in the ⁶⁴Zn(³He,t)⁶⁴Ga reaction. Diel, F.; Fujita, Y.; Fujita, H.; Cappuzzello, F.; Ganioğlu, E.; Grewe, E.-W.; Hashimoto, T.; Hatanaka, K.; Honma, M.; Itoh, T.; Jolie, J.; Liu, Bin; Otsuka, T.; Takahisa, K.; Susoy, G.; Rubio, B.; Tamii, A. Phys. Rev. C (2019) 99(5), p. 054322.
  • [ DOI ]

• A simple procedure for γ-γ lifetime measurements using multi-element fast-timing arrays. Régis, J.-M.; Dannhoff, M.; Jolie, J. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment (2018) 897, pp. 38–46.
  • [ Abstract ]
  • [ DOI ]
  Abstract The lifetimes of nuclear excited states are important observables in nuclear physics. Their precise measurement is of key importance for developing and testing nuclear models as they are directly linked with the quantum nature of the nuclear system. The γ - γ timing technique represents a direct lifetime determination by means of time-difference measurements between the γ rays which directly feed and decay from a nuclear excited state. Using arrays of very-fast scintillator detectors, picosecond-sensitive time-difference measurements can be performed. We propose to construct a symmetric energy–energy–time cube as is usually done to perform γ - γ coincidence analyses and lifetime determination with high-resolution germanium detectors. By construction, a symmetric mean time-walk characteristics is obtained, that can be precisely determined and used as a single time correction for all the data independently of the detectors. We present the results of timing characteristics measurements of an array with six LaBr 3 (Ce) detectors, as obtained using a 152Eu point γ -ray source. Compared with a single detector pair, the time resolution of the symmetrised time-difference spectra of the array is nearly unaffected.
• Evolution of deformation in neutron-rich Ba isotopes up to A=150. Lică, R.; Benzoni, G.; Rodríguez, T. R.; Borge, M. J. G.; Fraile, L. M.; Mach, H.; Morales, A. I.; Madurga, M.; Sotty, C. O.; Vedia, V.; De Witte, H.; Benito, J.; Bernard, R. N.; Berry, T.; Bracco, A.; Camera, F.; Ceruti, S.; Charviakova, V.; Cieplicka-Oryńczak, N.; Costache, C.; Crespi, F. C. L.; Creswell, J.; Fernandez-Martínez, G.; Fynbo, H.; Greenlees, P. T.; Homm, I.; Huyse, M.; Jolie, J.; Karayonchev, V.; Köster, U.; Konki, J.; Kröll, T.; Kurcewicz, J.; Kurtukian-Nieto, T.; Lazarus, I.; Lund, M. V.; Mărginean, N.; Mărginean, R.; Mihai, C.; Mihai, R. E.; Negret, A.; Orduz, A.; Patyk, Z.; Pascu, S.; Pucknell, V.; Rahkila, P.; Rapisarda, E.; Regis, J. M.; Robledo, L. M.; Rotaru, F.; Saed-Samii, N.; Sánchez-Tembleque, V.; Stanoiu, M.; Tengblad, O.; Thuerauf, M.; Turturica, A.; Van Duppen, P.; Warr, N. Phys. Rev. C (2018) 97(2), p. 024305.
  • [ DOI ]
• Lifetime determination in 190,192,194,196Hg via γ-γ fast-timing spectroscopy. Esmaylzadeh, A.; Gerhard, L. M.; Karayonchev, V.; Régis, J.-M.; Jolie, J.; Bast, M.; Blazhev, A.; Braunroth, T.; Dannhoff, M.; Dunkel, F.; Fransen, C.; Häfner, G.; Knafla, L.; Ley, M.; Müller-Gatermann, C.; Schomacker, K.; Warr, N.; Zell, K.-O. Phys. Rev. C (2018) 98(1), p. 014313.
  • [ DOI ]
• Transition probabilities in neutron-rich 80,82Se and the role of the νg9/2 orbital. Litzinger, J.; Blazhev, A.; Dewald, A.; Didierjean, F.; Duchêne, G.; Fransen, C.; Lozeva, R.; Verney, D.; de Angelis, G.; Bazzacco, D.; Birkenbach, B.; Bottoni, S.; Bracco, A.; Braunroth, T.; Cederwall, B.; Corradi, L.; Crespi, F. C. L.; Désesquelles, P.; Eberth, J.; Ellinger, E.; Farnea, E.; Fioretto, E.; Gernhäuser, R.; Goasduff, A.; Görgen, A.; Gottardo, A.; Grebosz, J.; Hackstein, M.; Hess, H.; Ibrahim, F.; Jolie, J.; Jungclaus, A.; Kolos, K.; Korten, W.; Leoni, S.; Lunardi, S.; Maj, A.; Menegazzo, R.; Mengoni, D.; Michelagnoli, C.; Mijatovic, T.; Million, B.; Möller, O.; Modamio, V.; Montagnoli, G.; Montanari, D.; Morales, A. I.; Napoli, D. R.; Niikura, M.; Pietralla, N.; Pollarolo, G.; Pullia, A.; Quintana, B.; Recchia, F.; Reiter, P.; Rosso, D.; Sahin, E.; Salsac, M. D.; Scarlassara, F.; Söderström, P.-A.; Stefanini, A. M.; Stezowski, O.; Szilner, S.; Theisen, Ch.; Valiente-Dobón, J. J.; Vandone, V.; Vogt, A. Phys. Rev. C (2018) 97(4), p. 044323.
  • [ DOI ]
• High-spin structure in the transitional nucleus 131Xe: Competitive neutron and proton alignment in the vicinity of the N=82 shell closure. Kaya, L.; Vogt, A.; Reiter, P.; Siciliano, M.; Birkenbach, B.; Blazhev, A.; Coraggio, L.; Teruya, E.; Yoshinaga, N.; Higashiyama, K.; Arnswald, K.; Bazzacco, D.; Bracco, A.; Bruyneel, B.; Corradi, L.; Crespi, F. C. L.; de Angelis, G.; Eberth, J.; Farnea, E.; Fioretto, E.; Fransen, C.; Fu, B.; Gadea, A.; Gargano, A.; Giaz, A.; Görgen, A.; Gottardo, A.; Hadyńska-Klęk, K.; Hess, H.; Hetzenegger, R.; Hirsch, R.; Itaco, N.; John, P. R.; Jolie, J.; Jungclaus, A.; Korten, W.; Leoni, S.; Lewandowski, L.; Lunardi, S.; Menegazzo, R.; Mengoni, D.; Michelagnoli, C.; Mijatović, T.; Montagnoli, G.; Montanari, D.; Müller-Gatermann, C.; Napoli, D.; Podolyák, Zs.; Pollarolo, G.; Pullia, A.; Queiser, M.; Recchia, F.; Rosiak, D.; Saed-Samii, N.; Şahin, E.; Scarlassara, F.; Schneiders, D.; Seidlitz, M.; Siebeck, B.; Smith, J. F.; Söderström, P.-A.; Stefanini, A. M.; Steinbach, T.; Stezowski, O.; Szilner, S.; Szpak, B.; Ur, C.; Valiente-Dobón, J. J.; Wolf, K.; Zell, K. O. Phys. Rev. C (2018) 98(1), p. 014309.
  • [ DOI ]
• Archaeometry at the PGAA facility of MLZ - Prompt gamma-ray neutron activation analysis and neutron tomography. Kluge, E. J.; Stieghorst, C.; Wagner, F.E.; Gebhard, R.; Revay, Zs.; Jolie, J. Journal of Archaeological Science: Reports (2018) 20, pp. 303–306.
  • [ Abstract ]
  • [ DOI ]
  Instrumental neutron techniques such as Prompt Gamma-ray Activation Analysis and Neutron Tomography and their combination, are effective methods to obtain chemical compositions with good detection limits and visualize internal structures within a sample. As non-destructive analysis methods, they are especially suitable for the investigation of cultural heritage objects and are therefore attractive for the field of archaeometry. This article reports on the investigation of two ring-like Celtic burial gifts from the Bavarian region using these methods. In contrast to our initial resumption, the two rings were not made in the same way. Our results clearly show completely different compositions and internal structures.
• The SPEDE spectrometer. Papadakis, P.; Cox, D. M.; O’Neill, G. G.; Borge, M. J. G.; Butler, P. A.; Gaffney, L. P.; Greenlees, P. T.; Herzberg, R. D.; Illana, A.; Joss, D. T.; Konki, J.; Kröll, T.; Ojala, J.; Page, R. D.; Rahkila, P.; Ranttila, K.; Thornhill, J.; Tuunanen, J.; Van Duppen, P.; Warr, N.; Pakarinen, J. The European Physical Journal A (2018) 54(3), p. 42.
  • [ Abstract ]
  • [ DOI ]
  The electron spectrometer, SPEDE, has been developed and will be employed in conjunction with the Miniball spectrometer at the HIE-ISOLDE facility, CERN. SPEDE allows for direct measurement of internal conversion electrons emitted in-flight, without employing magnetic fields to transport or momentum filter the electrons. Together with the Miniball spectrometer, it enables simultaneous observation of {\\($ {\backslash}gamma{\$\)}\($\gamma$\)rays and conversion electrons in Coulomb excitation experiments using radioactive ion beams.
• First Accurate Normalization of the beta-delayed alpha Decay of 16N and Implications for the 12C(alpha,gamma)16O Astrophysical Reaction Rate. Kirsebom, O. S.; Tengblad, O.; Lica, R.; Munch, M.; Riisager, K.; Fynbo, H. O. U.; Borge, M. J. G.; Madurga, M.; Marroquin, I.; Andreyev, A. N.; Berry, T. A.; Christensen, E. R.; Fernández, P. D’i}az; Doherty, D. T.; Van Duppen, P.; Fraile, L. M.; Gallardo, M. C.; Greenlees, P. T.; Harkness-Brennan, L. J.; Hubbard, N.; Huyse, M.; Jensen, J. H.; Johansson, H.; Jonson, B.; Judson, D. S.; Konki, J.; Lazarus, I.; Lund, M. V.; Marginean, N.; Marginean, R.; Perea, A.; Mihai, C.; Negret, A.; Page, R. D.; Pucknell, V.; Rahkila, P.; Sorlin, O.; Sotty, C.; Swartz, J. A.; So}rensen, H. B.; Törnqvist, H.; Vedia, V.; Warr, N.; De Witte, H. Phys. Rev. Lett. (2018) 121(14), p. 142701.
  • [ DOI ]
• Structure of even-even cadmium isotopes from the beyond-mean-field interacting boson model. Nomura, K.; Jolie, J. Phys. Rev. C (2018) 98(2), p. 024303.
  • [ DOI ]
• Low-lying electromagnetic transition strengths in 180Pt. Müller-Gatermann, C.; Dewald, A.; Fransen, C.; Braunroth, T.; Jolie, J.; Litzinger, J.; Régis, J. M.; von Spee, F.; Warr, N.; Zell, K. O.; Grahn, T.; Greenlees, P. T.; Hauschild, K.; Jakobsson, U.; Julin, R.; Juutinen, S.; Ketelhut, S.; Nieminen, P.; Nyman, M.; Peura, P.; Rahkila, P.; Ruotsalainen, P.; Sandzelius, M.; Sarén, J.; Scholey, C.; Sorri, J.; Stolze, S.; Uusitalo, J.; Petkov, P. Phys. Rev. C (2018) 97(2), p. 024336.
  • [ DOI ]
• Study of isomeric states in 198,200,202,206 Pb and 206 Hg populated in fragmentation reactions. Lalović, N; Rudolph, D; Podolyák, Zs; Sarmiento, L G; Simpson, E C; Alexander, T; Cortés, M L; Gerl, J; Golubev, P; Ameil, F; Arici, T; Bauer, Ch; Bazzacco, D; Bentley, M A; Boutachkov, P; Bowry, M; Fahlander, C; Gadea, A; Gellanki, J; Givechev, A; Goel, N; Górska, M; Gottardo, A; Gregor, E; Guastalla, G; Habermann, T; Hackstein, M; Jungclaus, A; Kojouharov, I; Kumar, R; Kurz, N; Lettmann, M; Lizarazo, C; Louchart, C; Merchán, E; Michelagnoli, C; Moeller, Th; Moschner, K; Patel, Z; Pietralla, N; Pietri, S; Ralet, D; Reese, M; Regan, P H; Reiter, P; Schaffner, H; Singh, P; Stahl, C; Stegmann, R; Stezowski, O; Taprogge, J; Thöle, P; Wendt, A; Wieland, O; Wilson, E; Wood, R; Wollersheim, H-J; Birkenbach, B; Bruyneel, B; Burrows, I; Clément, E; Désesquelles, P; Domingo-Pardo, C; Eberth, J; González, V; Hess, H; Jolie, J; Judson, D S; Menegazzo, R; Mengoni, D; Napoli, D R; Pullia, A; Quintana, B; Rainovski, G; Salsac, M D; Sanchis, E; Simpson, J; Dóbon, J J Valiente; Collaboration, the AGATA. Journal of Physics G: Nuclear and Particle Physics (2018) 45(3), p. 035105.
  • [ Abstract ]
  Isomeric states in isotopes in the vicinity of doubly-magic 208 Pb were populated following reactions of a relativistic 208 Pb primary beam impinging on a 9 Be fragmentation target. Secondary beams of 198,200,202,206 Pb and 206 Hg were isotopically separated and implanted in a passive stopper positioned in the focal plane of the GSI Fragment Separator. Delayed γ rays were detected with the Advanced Gamma Tracking Array (AGATA). Decay schemes were re-evaluated and interpreted with shell-model calculations. The momentum-dependent population of isomeric states in the two-nucleon hole nuclei 206 Pb/ 206 Hg was found to differ from the population of multi neutron-hole isomeric states in 198,200,202 Pb.
• Evolution of deformation in neutron-rich Ba isotopes up to \($A=150$\). Lica, R.; Benzoni, G.; Rodr’i}guez, T. R.; Borge, M. J. G.; Fraile, L. M.; Mach, H.; Morales, A. I.; Madurga, M.; Sotty, C. O.; Vedia, V.; De Witte, H.; Benito, J.; Bernard, R. N.; Berry, T.; Bracco, A.; Camera, F.; Ceruti, S.; Charviakova, V.; Cieplicka-Oryifmmode \acute{n}else ń\fi{}czak, N.; Costache, C.; Crespi, F. C. L.; Creswell, J.; Fernandez-Mart’i}nez, G.; Fynbo, H.; Greenlees, P. T.; Homm, I.; Huyse, M.; Jolie, J.; Karayonchev, V.; Köster, U.; Konki, J.; Kröll, T.; Kurcewicz, J.; Kurtukian-Nieto, T.; Lazarus, I.; Lund, M. V.; Mifmmode ua}else \ua}\fi{}rginean, N.; Mifmmode ua}else \ua}\fi{}rginean, R.; Mihai, C.; Mihai, R. E.; Negret, A.; Orduz, A.; Patyk, Z.; Pascu, S.; Pucknell, V.; Rahkila, P.; Rapisarda, E.; Regis, J. M.; Robledo, L. M.; Rotaru, F.; Saed-Samii, N.; Sánchez-Tembleque, V.; Stanoiu, M.; Tengblad, O.; Thuerauf, M.; Turturica, A.; Van Duppen, P.; Warr, N. Phys. Rev. C (2018) 97(2), p. 024305.
  • [ DOI ]

• Beta decay studies of n-rich Cs isotopes with the ISOLDE Decay Station. Licua}}, R; Benzoni, G; Morales, A I; Borge, M J G; Fraile, L M; Mach, H; Madurga, M; Sotty, C; Vedia, V; Witte, H De; Benito, J; Berry, T; Blasi, N; Bracco, A; Camera, F; Ceruti, S; Charviakova, V; Cieplicka-Oryńczak, N; Costache, C; Crespi, F C L; Creswell, J; Fernández-Mart’i}}nez, G; Fynbo, H; Greenlees, P; Homm, I; Huyse, M; Jolie, J; Karayonchev, V; Köster, U; Konki, J; Kröll, T; Kurcewicz, J; Kurtukian-Nieto, T; Lazarus, I; Leoni, S; Lund, M; Marginean, N; Marginean, R; Mihai, C; Mihai, R; Negret, A; Orduz, A; Patyk, Z; Pascu, S; Pucknell, V; Rahkila, P; Regis, J M; Rotaru, F; Saed-Sami, N; Sánchez-Tembleque, V; Stanoiu, M; Tengblad, O; Thuerauf, M; Turturica, A; Duppen, P Van; Warr, N. Journal of Physics G: Nuclear and Particle Physics (2017) 44(5), p. 054002.
  • [ Abstract ]
  • [ DOI ]
  Neutron-rich Ba isotopes are expected to exhibit octupolar correlations, reaching their maximum in isotopes around mass A = 146. The odd-A neutron-rich members of this isotopic chain show typical patterns related to non-axially symmetric shapes, which are however less marked compared to even-A ones, pointing to a major contribution from vibrations. In the present paper we present results from a recent study focused on 148–150Cs β-decay performed at the ISOLDE Decay Station equipped with fast-timing detectors. A detailed analysis of the measured decay half-lives and decay scheme of 149Ba is presented, giving a first insight in the structure of this neutron-rich nucleus.
• Identification of the crossing point at N=21 between normal and intruder configurations. Lica, R.; Rotaru, F.; Borge, M. J. G.; Grévy, S.; Negoiifmmode \mbox{\c{t}}else \ct}\fi{}ifmmode ua}else \ua}\fi{}, F.; Poves, A.; Sorlin, O.; Andreyev, A. N.; Borcea, R.; Costache, C.; De Witte, H.; Fraile, L. M.; Greenlees, P. T.; Huyse, M.; Ionescu, A.; Kisyov, S.; Konki, J.; Lazarus, I.; Madurga, M.; Mifmmode ua}else \ua}\fi{}rginean, N.; Mifmmode ua}else \ua}\fi{}rginean, R.; Mihai, C.; Mihai, R. E.; Negret, A.; Page, R. D.; Pakarinen, J.; Pascu, S.; Pucknell, V.; Rahkila, P.; Rapisarda, E.; ifmmode mboxŞelse \cS}\fi{}erban, A.; Sotty, C. O.; Stan, L.; Stifmmode ua}else \ua}\fi{}noiu, M.; Tengblad, O.; Turturicifmmode ua}else \ua}\fi{}, A.; Van Duppen, P.; Wadsworth, R.; Warr, N. Phys. Rev. C (2017) 95(2), p. 021301.
  • [ DOI ]
• Nuclear structure investigations of ⁸⁴Sr and ⁸⁶Sr using γ-ray spectroscopic methods. Duckwitz, H.; Petkov, P.; Thomas, T.; Ahn, T.; Blazhev, A.; Cooper, N.; Fransen, C.; Hinton, M.; Ilie, G.; Jolie, J.; Werner, V. Nuclear Physics A (2017) 965(Supplement C), pp. 13–56.
  • [ DOI ]
• EXILL—a high-efficiency, high-resolution setup for γ-spectroscopy at an intense cold neutron beam facility. Jentschel, M.; Blanc, A.; de France, G.; Köster, U.; Leoni, S.; Mutti, P.; Simpson, G.; Soldner, T.; Ur, C.; Urban, W.; Ahmed, S.; Astier, A.; Augey, L.; Back, T.; Ba̧czyk P.; Bajoga, A.; Balabanski, D.; Belgya, T.; Benzoni, G.; Bernards, C.; Biswas, D.C.; Bocchi, G.; Bottoni, S.; Britton, R.; Bruyneel, B.; Burnett, J.; Cakirli, R.B.; Carroll, R.; Catford, W.; Cederwall, B.; Celikovic, I.; Cieplicka-Oryńczak, N.; Clement, E.; Cooper, N.; Crespi, F.; Csatlos, M.; Curien, D.; Czerwiński, M.; Danu, L.S.; Davies, A.; Didierjean, F.; Drouet, F.; Duchêne, G.; Ducoin, C.; Eberhardt, K.; Erturk, S.; Fraile, L.M.; Gottardo, A.; Grente, L.; Grocutt, L.; Guerrero, C.; Guinet, D.; Hartig, A.-L.; Henrich, C.; Ignatov, A.; Ilieva, S.; Ivanova, D.; John, B.V.; John, R.; Jolie, J.; Kisyov, S.; Krticka, M.; Konstantinopoulos, T.; Korgul, A.; Krasznahorkay, A.; Kröll, T.; Kurpeta, J.; Kuti, I.; Lalkovski, S.; Larijani, C.; Leguillon, R.; Lica, R.; Litaize, O.; Lozeva, R.; Magron, C.; Mancuso, C.; Martinez, E. Ruiz; Massarczyk, R.; Mazzocchi, C.; Melon, B.; Mengoni, D.; Michelagnoli, C.; Million, B.; Mokry, C.; Mukhopadhyay, S.; Mulholland, K.; Nannini, A.; Napoli, D.R.; Olaizola, B.; Orlandi, R.; Patel, Z.; Paziy, V.; Petrache, C.; Pfeiffer, M.; Pietralla, N.; Podolyak, Z.; Ramdhane, M.; Redon, N.; Regan, P.; Regis, J.M.; Regnier, D.; Oliver, R. J.; Rudigier, M.; Runke, J.; Rza̧ca-Urban T.; Saed-Samii, N.; Salsac, M.D.; Scheck, M.; Schwengner, R.; Sengele, L.; Singh, P.; Smith, J.; Stezowski, O.; Szpak, B.; Thomas, T.; Thürauf, M.; Timar, J.; Tom, A.; Tomandl, I.; Tornyi, T.; Townsley, C.; Tuerler, A.; Valenta, S.; Vancraeyenest, A.; Vandone, V.; Vanhoy, J.; Vedia, V.; Warr, N.; Werner, V.; Wilmsen, D.; Wilson, E.; Zerrouki, T.; Zielinska, M. Journal of Instrumentation (2017) 12(11), p. P11003.
  • [ Abstract ]
  In the EXILL campaign a highly efficient array of high purity germanium (HPGe) detectors was operated at the cold neutron beam facility PF1B of the Institut Laue-Langevin (ILL) to carry out nuclear structure studies, via measurements of γ-rays following neutron-induced capture and fission reactions. The setup consisted of a collimation system producing a pencil beam with a thermal capture equivalent flux of about 10 8 n s −1 cm −2 at the target position and negligible neutron halo. The target was surrounded by an array of eight to ten anti-Compton shielded EXOGAM Clover detectors, four to six anti-Compton shielded large coaxial GASP detectors and two standard Clover detectors. For a part of the campaign the array was combined with 16 LaBr 3 :(Ce) detectors from the FATIMA collaboration. The detectors were arranged in an array of rhombicuboctahedron geometry, providing the possibility to carry out very precise angular correlation and directional-polarization correlation measurements. The triggerless acquisition system allowed a signal collection rate of up to 6 × 10 5 Hz. The data allowed to set multi-fold coincidences to obtain decay schemes and in combination with the FATIMA array of LaBr 3 :(Ce) detectors to analyze half-lives of excited levels in the pico- to microsecond range. Precise energy and efficiency calibrations of EXILL were performed using standard calibration sources of 133 Ba, 60 Co and 152 Eu as well as data from the reactions 27 Al(n,γ) 28 Al and 35 Cl( n ,γ) 36 Cl in the energy range from 30 keV up to 10 MeV.
• Evolution of collectivity in the N=100 isotones near ¹⁷⁰Yb. Karayonchev, V.; Régis, J.-M.; Jolie, J.; Blazhev, A.; Altenkirch, R.; Ansari, S.; Dannhoff, M.; Diel, F.; Esmaylzadeh, A.; Fransen, C.; Gerst, R.-B.; Moschner, K.; Müller-Gatermann, C.; Saed-Samii, N.; Stegemann, S.; Warr, N.; Zell, K. O. Phys. Rev. C (2017) 95(3), p. 034316.
  • [ DOI ]
• Low collectivity of the 2+1 state of 212Po. Kocheva, D.; Rainovski, G.; Jolie, J.; Pietralla, N.; Blazhev, A.; Altenkirch, R.; Ansari, S.; Astier, A.; Bast, M.; Beckers, M.; Braunroth, Th.; Cappellazzo, M.; Dewald, A.; Diel, F.; Djongolov, M.; Fransen, C.; Gladnishki, K.; Goldkuhle, A.; Hennig, A.; Karayonchev, V.; Keatings, J. M.; Kluge, E.; Kröll, Th.; Litzinger, J.; Moschner, K.; Müller-Gatermann, C.; Petkov, P.; Scheck, M.; Scholz, Ph.; Schmidt, T.; Spagnoletti, P.; Stahl, C.; Stegmann, R.; Stolz, A.; Vogt, A.; Warr, N.; Werner, V.; Wölk, D.; Zamora, J. C.; Zell, K. O.; Ponomarev, V. Yu.; Van Isacker, P. Phys. Rev. C (2017) 96(4), p. 044305.
  • [ DOI ]
• Collectivity in196,198Pb isotopes probed in Coulomb-excitation experiments at REX-ISOLDE. Pakarinen, J; Grahn, T; Gaffney, L P; Algora, A; Bauer, C; Blazhev, A; Bree, N; Cocolios, T E; Witte, H De; Diriken, J; Fernier, P; Hadyńska-Klȩk, K; Herzáň, A; Huyse, M; Iwanicki, J; Jakobsson, U; Jenkins, D; Kesteloot, N; Konki, J; Lannoo, B; Papadakis, P; Peura, P; Rahkila, P; Rainovski, G; Rapisarda, E; Reiter, P; Sambi, S; Scheck, M; Seibeck, B; Seidlitz, M; Stora, T; Duppen, P Van; Warr, N; Wenander, F; Vermeulen, M J; Voulot, D; Wrzosek-Lipska, K; Zielińska, M. Journal of Physics G: Nuclear and Particle Physics (2017) 44(6), p. 064009.
  • [ Abstract ]
  • [ DOI ]
  The neutron-deficient Pb isotopes have been studied in Coulomb-excitation experiments employing the Miniball γ-ray spectrometer and radioactive ion beams from the REX-ISOLDE post-accelerator at CERN. The reduced transition probabilities of the first excited 2+ states in 196Pb and 198Pb nuclei have been measured for the first time. Values of W.u. and W.u., were obtained, respectively. The experiment sheds light on the development of collectivity when moving from the regime governed by the generalised seniority scheme to a region, where intruding structures, associated with different deformed shapes, start to come down in energy and approach the spherical ground state.
• Erratum: Abrupt shape transition at neutron number N = 60: B(E2) values in ⁹⁴’⁹⁶’⁹⁸Sr from fast γ-γ timing. Régis, J.-M.; Jolie, J.; Saed-Samii, N.; Warr, N.; Pfeiffer, M.; Blanc, A.; Jentschel, M.; Késter, U.; Mutti, P.; Soldner, T.; Simpson, G. S.; Drouet, F.; Vancraeyenest, A.; de France, G.; Clément, E.; Stezowski, O.; Ur, C. A.; Urban, W.; Regan, P. H.; Podolyák, Zs.; Larijani, C.; Townsley, C.; Carroll, R.; Wilson, E.; Fraile, L. M.; Mach, H.; Paziy, V.; Olaizola, B.; Vedia, V.; Bruce, A. M.; Roberts, O. J.; Smith, J. F.; Scheck, M.; Kröll, T.; Hartig, A.-L.; Ignatov, A.; Ilieva, S.; Lalkovski, S.; Korten, W.; Marginean, N.; Otsuka, T.; Shimizu, N.; Togashi, T.; Tsunoda, Y. Phys. Rev. C (2017) 95(6), p. 069902.
  • [ DOI ]
• Shell-model-based deformation analysis of light cadmium isotopes. Schmidt, T.; Heyde, K. L. G.; Blazhev, A.; Jolie, J. Phys. Rev. C (2017) 96(1), p. 014302.
  • [ DOI ]
• Lifetimes and electromagnetic transition strengths in ¹⁵⁷Dy. Gladnishki, K. A.; Petkov, P.; Möller, O.; Dewald, A.; Jolie, J.; Tonev, D.; Trichkova, M.; Heinze, S.; von Brentano, P.; Bazzacco, D.; Ur, C. A.; Farnea, E.; Axiotis, M.; Lunardi, S.; de Angelis, G.; Napoli, D. R.; Marginean, N.; Martinez, T.; Caprio, M. A.; Rainovski, G. Phys. Rev. C (2017) 96(2), p. 024324.
  • [ DOI ]
• A revised B(E2;2⁺₁→ 0⁺₁) value in the semi-magic nucleus ²¹⁰Po. Kocheva, D.; Rainovski, G.; Jolie, J.; Pietralla, N.; Blazhev, A.; Astier, A.; Altenkirch, R.; Ansari, S.; Braunroth, Th.; Cortés, M. L.; Dewald, A.; Diel, F.; Djongolov, M.; Fransen, C.; Gladnishki, K.; Hennig, A.; Karayonchev, V.; Keatings, J. M.; Kluge, E.; Litzinger, J.; Müller-Gatermann, C.; Petkov, P.; Rudigier, M.; Scheck, M.; Scholz, Ph.; Spagnoletti, P.; Spieker, M.; Stahl, C.; Stegmann, R.; Stoyanova, M.; Thöle, P.; Warr, N.; Werner, V.; Witt, W.; Wölk, D.; Zell, K. O.; Van Isacker, P.; Ponomarev, V. Yu. The European Physical Journal A (2017) 53(9), p. 175.
  • [ Abstract ]
  • [ DOI ]
  A revised B(E2;2⁺₁→ 0⁺₁) value in the semi-magic nucleus ²¹⁰Po

• Low-lying isovector 2+ valence-shell excitations of 212Po. Kocheva, D.; Rainovski, G.; Jolie, J.; Pietralla, N.; Stahl, C.; Petkov, P.; Blazhev, A.; Hennig, A.; Astier, A.; Braunroth, Th.; Cortés, M. L.; Dewald, A.; Djongolov, M.; Fransen, C.; Gladnishki, K.; Karayonchev, V.; Litzinger, J.; Müller-Gatermann, C.; Scheck, M.; Scholz, Ph.; Stegmann, R.; Thöle, P.; Werner, V.; Witt, W.; Wölk, D.; Van Isacker, P. Phys. Rev. C (2016) 93(1), p. 011303.
  • [ DOI ]
• Measurement of picosecond lifetimes in neutron-rich Xe isotopes. Ilieva, S.; Kröll, Th.; Régis, J.-M.; Saed-Samii, N.; Blanc, A.; Bruce, A. M.; Fraile, L. M.; de France, G.; Hartig, A.-L.; Henrich, C.; Ignatov, A.; Jentschel, M.; Jolie, J.; Korten, W.; Köster, U.; Lalkovski, S.; Lozeva, R.; Mach, H.; Mărginean, N.; Mutti, P.; Paziy, V.; Regan, P. H.; Simpson, G. S.; Soldner, T.; Thürauf, M.; Ur, C. A.; Urban, W.; Warr, N. Phys. Rev. C (2016) 94(3), p. 034302.
  • [ DOI ]

• Germanium-gated γ–γ fast timing of excited states in fission fragments using the EXILL&FATIMA spectrometer. Régis, J.-M.; Simpson, G.S.; Blanc, A.; de France, G.; Jentschel, M.; Köster, U.; Mutti, P.; Paziy, V.; Saed-Samii, N.; Soldner, T.; Ur, C.A.; Urban, W.; Bruce, A.M.; Drouet, F.; Fraile, L.M.; Ilieva, S.; Jolie, J.; Korten, W.; Kröll, T.; Lalkovski, S.; Mach, H.; Mărginean, N.; Pascovici, G.; Podolyak, Zs.; Regan, P.H.; Roberts, O.J.; Smith, J.F.; Townsley, C.; Vancraeyenest, A.; Warr, N. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment (2014) 763, pp. 210–220.
  • [ Abstract ]
  • [ DOI ]
  Abstract A high-granularity mixed spectrometer consisting of high-resolution Ge and very fast LaBr3(Ce)-scintillator detectors has been installed around a fission target at the cold-neutron guide PF1B of the high-flux reactor of the Institut Laue–Langevin. Lifetimes of excited states in the range of 10ps to 10ns can be measured in around 100 exotic neutron-rich fission fragments using Ge-gated LaBr3(Ce)–LaBr3(Ce) or Ge–Ge–LaBr3(Ce)–LaBr3(Ce) coincidences. We report on various characteristics of the EXILL&FATIMA spectrometer for the energy range of 40keV up to 6.8MeV and present results of ps-lifetime test measurements in a fission fragment. The results are discussed with respect to possible systematic errors induced by background contributions.
• Bose–Fermi symmetry in the odd–even gold isotopes. Thomas, T.; Régis, J.-M.; Jolie, J.; Heinze, S.; Albers, M.; Bernards, C.; Fransen, C.; Radeck, D. Nuclear Physics A (2014) 925, pp. 96–111.
  • [ Abstract ]
  • [ DOI ]
  Abstract In this work the results of an in-beam experiment on 195Au are presented, yielding new spins, multipole mixing ratios, and new low-lying states essential for the understanding of this nucleus. The positive-parity states from this work together with compiled data from the available literature for 185–199Au are compared to Interacting Boson Fermion Model calculations employing the Spin(6) Bose–Fermi symmetry. The evolution of the parameters for the τ splitting and the J splitting reveals a smooth behavior. Thereby, a common description based on the Bose–Fermi symmetry is found for 189–199Au. Furthermore, the calculated E2 transition strengths are compared to experimental values with fixed effective boson and fermion charges for all odd–even gold isotopes, emphasizing that the Spin(6) Bose–Fermi symmetry is valid for the gold isotopes.
• The structure of ¹⁹³Au within the Interacting Boson Fermion Model. Thomas, T.; Bernards, C.; Régis, J.-M.; Albers, M.; Fransen, C.; Jolie, J.; Heinze, S.; Radeck, D.; Warr, N.; Zell, K.-O. Nuclear Physics A (2014) 922, pp. 200–224.
  • [ Abstract ]
  • [ DOI ]
  Abstract A γγ angular correlation experiment investigating the nucleus 193Au is presented. In this work the level scheme of 193Au is extended by new level information on spins, multipolarities and newly observed states. The new results are compared with theoretical predictions from a general Interacting Boson Fermion Model (IBFM) calculation for the positive-parity states. The experimental data is in good agreement with an IBFM calculation using all proton orbitals between the shell closures at Z=50 and Z=126. As a dominant contribution of the d3/2 orbital to the wave function of the lowest excited states is observed, a truncated model of the IBFM using a Bose–Fermi symmetry is applied to the describe 193Au. Using the parameters of a fit performed for 193Au, the level scheme of 192Pt, the supersymmetric partner of 193Au, is predicted but shows a too small boson seniority splitting. We obtained a common fit by including states observed in 192Pt. With the new parameters a supersymmetric description of both nuclei is established.
• Low-lying isomeric states in 80Ga from the β- decay of 80Zn. Lică, R.; Mărginean, N.; Ghiţă, D. G.; Mach, H.; Fraile, L. M.; Simpson, G. S.; Aprahamian, A.; Bernards, C.; Briz, J. A.; Bucher, B.; Chiara, C. J.; Dlouhý, Z.; Gheorghe, I.; Hoff, P.; Jolie, J.; Köster, U.; Kurcewicz, W.; Mărginean, R.; Olaizola, B.; Paziy, V.; Régis, J. M.; Rudigier, M.; Sava, T.; Stănoiu, M.; Stroe, L.; Walters, W. B. Phys. Rev. C (2014) 90(1), p. 014320.
  • [ DOI ]