Measurement of decay properties for r-process models*

Understanding the rapid neutron capture nucleosynthesis process (r-process) requires precise data on decay properties, in particular half-lives ($T_{1/2}$) and probability of beta delayed neutron emission ($P_n$). We did an experiment to measure $T_{1/2}$ and $P_n$ values of neutron-rich isotopes around mass A = 100 using the state-of-the-art instrumentation of the beta-delayed neutron detector at RIKEN (BRIKEN) in the Radioactive Ion Beam Factory (RIBF) at RIKEN lab in Japan. The current status of the analysis will be presented. We also performed r-process calculations using the Webnucleo reaction network code using thermodynamic trajectories that parameterize conditions that lead to a r-process. We will present the importance of $T_{1/2}$ and $P_n$ values of neutron-rich isotopes around the mass A = 100 to r-process calculations