Proton-hole and core-excited states in the semi-magic nucleus ¹³¹In82

Abstract

The β decay of the N = 83 nucleus ¹³¹Cd has been studied at the RIBF facility at the RIKEN Nishina Center. The main purpose of the study was to identify the position of the 1p₃/₂ and 0 f₅/₂ proton-hole states and the energies of core-excited configurations in the semi-magic nucleus ¹³¹In. From the radiation emitted following the ββ decay, a level scheme of ¹³¹In was established and the β feeding to each excited state determined. Similarities between the single-particle transitions observed in the ββ decays of the N = 83 isotones ¹³²In and ¹³¹Cd are discussed. Finally the excitation energies of several core-excited configurations in ¹³¹In are compared to QRPA and shell-model calculations. Show more