Identifying the spin trapped character of the $^{32}$Si isomeric state
J. WilliamsG. HackmanK. StarostaR. S. LubnaPriyanka ChoudharyP. C. SrivastavaC. AndreoiuD. AnnenH. AschM. D. H. K. G. BadanageG. C. BallM. BeuschleinH. BidamanV. BildsteinR. Coleman
J. WilliamsG. HackmanK. Starosta
...+29
Z. Yu
Nov 2023
0被引用
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摘要原文
The properties of a nanosecond isomer in $^{32}$Si, disputed in previous studies, depend on the evolution of proton and neutron shell gaps near the `island of inversion'. We have placed the isomer at 5505.2(2) keV with $J^{\pi} = 5^-$, decaying primarily via an $E3$ transition to the $2^+_1$ state. The $E3$ strength of 0.0841(10) W.u. is unusually small and suggests that this isomer is dominated by the $(\nu d_{3/2})^{-1} \otimes (\nu f_{7/2})^{1}$ configuration, which is sensitive to the $N=20$ shell gap. A newly observed $4^+_1$ state is placed at 5881.4(13) keV; its energy is enhanced by the $Z=14$ subshell closure. This indicates that the isomer is located in a `yrast trap', a feature rarely seen at low mass numbers.
