The rapid neutron capture process (r-process) is responsible for creating many of the heavy elements found in the universe. However, the key reaction rates involved are extremely difficult to measure, especially for short-lived, exotic nuclei.
In a recent experiment at Argonne National Laboratory, researchers studied the neutron-rich isotope cesium-141 (¹⁴¹Cs) using an innovative technique known as the β-Oslo method. By observing how its precursor nucleus decays and emits gamma rays, they were able to extract important nuclear properties that are usually out of reach.
The results suggest that ¹⁴¹Cs sits at the edge of where commonly used statistical models still apply. This finding hints at a transition to more complex, resonance-driven behavior in neutron capture—an effect that could significantly influence how heavy elements are formed in astrophysical environments.
The article can be found here
