β-delayed neutron emission of r-process nuclei at the N = 82 shell closure

Abstract Theoretical models of β-delayed neutron emission are used as crucial inputs in r-process calculations. Benchmarking the predictions of these models is a challenge due to a lack of currently available experimental data. In this work the β-delayed neutron emission probabilities of 33 nuclides in the important mass regions south and south-west of 132Sn are presented, 16 for the first time. The measurements were performed at RIKEN using the Advanced Implantation Detector Array (AIDA) and the BRIKEN neutron detector array. The P 1n values presented constrain the predictions of theoretical models in the region, affecting the final abundance distribution of the second r-process peak at A ≈ 130 .