Identification ofSe88and new levels inSe84,86<

Abstract

From the analysis of γ -γ -γ coincidence data taken with Gammasphere of the prompt γ rays in the spontaneous fission of 252 Cf, the 2 + → 0 + transition in 88 Se was identified for the first time. Also, the 4 + → 2 + and 6 + → 4 + transitions in 86 Se were identified along with four new states above 4 + in 84 Se. Surprisingly, the 2 + energy rises in 88 Se compared to 86 Se. This increase in energy could arise from the interaction of a low-lying excited 0 + state with different deformation and the 0 + ground state to depress the ground-state energy.

βdecay of nuclei around90Se: Search for signatures of aN=56subshell closure relevant to theQuinn1, Aprahamian2, Pereira3 et al. 2012Phys. Rev. C

“…The β-decay half lives of 33 As, 34 Se, 35 Br, 36 Kr, 37 Rb, 38 Sr, and 39 Y isotopes around N =56 were measured at the National Superconducting Cyclotron Laboratory. New half lives are reported for 88 As 55 and 90 Se 56 for the first time.…”

Transition probabilities in neutron-richSe84,86

“…Recently this work was extended to nuclei with N > 50 [7][8][9]. So far mainly low and medium spin excitations of the yrast bands of 84,86 Se have been observed [2,4,5,9,10].…”

β-decay properties of the very neutron-rich isotopesGe86andAsMazzocchi1, Rykaczewski2, Grzywacz3 et al. 2015Phys. Rev. C8150View full textAdd to dashboardCite

“…The spin and parity of the 704.1, 1567.4 and 2071.5 excited states was determined before by Kratz et al [19], Jones et al [20] and Czerwiński et al [21], respectively. Tentative I π =(2 + ) could be inferred for the 1398.6 keV level by taking into account:…”