High-spin, multiparticle isomers in Sb121,123

Le résumé fourni par la source

Isomers in near-spherical $Z=51$, antimony isotopes are reported here for the first time using fusion-fission reactions between $^{27}\mathrm{Al}$ and a pulsed $^{178}\mathrm{Hf}$ beam of energy, 1150 MeV. \ensuremath{\gamma} rays were observed from the decay of isomeric states with half-lives, ${T}_{1/2}=200(30)$ and $52(3)\ensuremath{\mu}$s, and angular momenta $I=(\frac{25}{2})$ and ${I}^{\ensuremath{\pi}}={\frac{23}{2}}^{+}$, in $^{121,123}\mathrm{Sb}$, respectively. These states are proposed to correspond to $\ensuremath{\nu}({h}_{\frac{11}{2}}){}^{2}$ configurations, coupled to an odd ${d}_{\frac{5}{2}}$ or ${g}_{\frac{7}{2}}$ proton. Nanosecond isomers were also identified at ${I}^{\ensuremath{\pi}}={\frac{19}{2}}^{\ensuremath{-}}$ [${T}_{1/2}=8.5(5)$ ns] in $^{121}\mathrm{Sb}$ and ${I}^{\ensuremath{\pi}}=({\frac{15}{2}}^{\ensuremath{-}})$ [${T}_{1/2}=37(4)$ ns] in $^{123}\mathrm{Sb}$. Information on spins and parities of states in these nuclei was obtained using a combination of angular correlation and intensity-balance measurements. The configurations of states in these nuclei are discussed using a combination of spin/energy systematics and shell-model calculations for neighboring tin isotones and antimony isotopes.

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