Abstract
Abstract The first evidence for β-delayed proton emission from the 16 + spin gap isomer in 96Cd is presented. The data were obtained from the Rare Isotope Beam Factory, at the RIKEN Nishina Center, using the BigRIPS spectrometer and the EURICA decay station. βp branching ratios for the ground state and 16 + isomer have been extracted along with more precise lifetimes for these states and the lifetime for the ground state decay of 95Cd. Large scale shell model (LSSM) calculations have been performed and WKB estimates made for l = 0 , 2 , 4 proton emission from three resonance-like states in 96Ag, that are populated by the β decay of the isomer, and the results compared to the new data. The calculations suggest that l = 2 proton emission from the resonance states, which reside ∼ 5 MeV above the proton separation energy, dominates the proton decay. The results highlight the importance of core-excited wavefunction components for the 16 + state.
Highlights
The region around 100Sn is the location of a fascinating variety of physical phenomena [1,2,3,4,5]
An energy threshold of 2 MeV was used to differentiate between β and βp decays, whilst a lower energy threshold of 150 keV was used for β decays
More precise values for the half-life of the ground state and 16+ spin gap isomer are presented, along with the measurement of the ground state half-life of 95Cd. βp delayed γ ray spectra show that high spin states are populated in the granddaughter nucleus 95Pd, with the most prominent decay paths populating both the 25/2+ and 29/2+ states in 95Pd
Summary
The region around 100Sn is the location of a fascinating variety of physical phenomena [1,2,3,4,5]. Recent experimental work on 100Sn measured the largest Gamow Teller (GT) strength for an allowed β-decay [6], the low lying levels of 92Pd [7] and the high spin isomeric state in 96Cd [2] highlight the importance of the isoscalar (T=0) proton-neutron (pn) interaction on energy levels in selfconjugate nuclei in the region, and the proximity of the N=Z=50 shell closure leads to a significant number of both spin-gap and seniority isomers, e.g., see [2, 4, 5, 8,9,10,11,12,13]. Reported are improved lifetime measurements for the ground state and 16+ isomer in 96Cd, as well as the lifetime of the ground state of 95Cd
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