ß-Delayed One and Two Neutron Emission Probabilities South-East of 132Sn and the Odd-Even Systematics in r-Process Nuclide Abundances

The beta-delayed one- and two-neutron emission probabilities (P-1n and P-2n) of 20 neutron-rich nuclei with N >= 82 have been measured at the RIBF facility of the RIKEN Nishina Center. P-1n of Ag-130;131, Cd-133;134, In-135;136, and (138;13)9Sn were determined for the first time, and stringent upper limits were placed on P-2n for nearly all cases. beta-delayed two-neutron emission (beta 2n) was unambiguously identified in Cd-133 and In-135;136, and their P-2n were measured. Weak beta 2n was also detected from Sn-137;138. Our results highlight the effect of the N = 82 and Z = 50 shell closures on beta-delayed neutron emission probability and provide stringent benchmarks for newly developed macroscopic-microscopic and self-consistent global models with the inclusion of a statistical treatment of neutron and. emission. The impact of our measurements on r-process nucleosynthesis was studied in a neutron star merger scenario. Our P-1n and P-2n have a direct impact on the

Automated summary

The beta-delayed one- and two-neutron emission probabilities of neutron-rich nuclei with N >= 82 were measured at the RIKEN Nishina Center. The results provide important benchmarks for macroscopic-microscopic and self-consistent global models, and have significant implications for r-process nucleosynthesis.