New measurement of β-decay properties of neutron-rich Se to Y isotopes relevant to r-process nucleosynthesis*

We have measured the β-decay half-lives and β-delayed neutron emission probabilities of neutron-rich ^92-96Se, ^94-99Br, ^97-102Kr, ^99-104Rb, ^101-106Sr, and ^104-108Y isotopes with the BRIKEN detector setup at the Radioactive Isotope Beam Factory (RIBF). Our results include a first measurement of β-delayed one-neutron emission probabilities for 23 isotopes and two-neutron emission probabilities for 16 cases. The data is important to test theoretical models of mid-shell nuclei and astrophysics models of nucleosynthesis during the weak r-process. In particular, we will discuss the importance for the calculation of the decay properties measured in our experiment of including the neutron-γ competition during the de-excitation from intermediate states populated in the β-decay process. We also present the impact of the new data for models of the r-process in high-entropy winds of core-collapse supernovae.