Subshell closure effects on the collectivity of 36 88 Kr52 and the beta decay of88Br to levels in88Kr

Abstract

The level structure of 88Kr has been investigated by measurements on chemically separated bromine samples. A total of 146 7-rays have been assigned to the decay of 88Br, and a level scheme with 58 levels is proposed. The collectivity of SaKr has been investigated within the framework of the Interacting Boson Approximation (IBA-2 model). Comparison of our detailed 7-ray data and calculations have led to the establishment of a proton hole boson desciption rather than proton particle nature. This supports recent works establishing Z= 40 as a major subshell closure.

Penning-trap-assisted study of excitations in Br88 populated in β decay of Se88Czerwiński1, Sieja2, Rza̧ca‐Urban3 et al. 2017Phys. Rev. C74102View full textAdd to dashboardCite

“…The 0 + spin and parity is excluded by the isospin selection rule and the 1 + solution would likely require a lower log f t. We also note that no positive-parity states are expected at low excitations in 88 Br [2]. Of the remaining 0 − and 1 [19]. The present 1 − spin and parity assignment to the ground state in 88 Br confirms the (1 − ) spin and parity solution, proposed in our fission study [2].…”