First observation of $\ensuremath{\gamma}$ rays emitted from excited states south-east of $^{132}\mathrm{Sn}$: The $\ensuremath{\pi}{g}_{9/2}^{\ensuremath{-}1}\ensuremath{\bigotimes}\ensuremath{\nu}{f}_{7/2}$ multiplet of $^{132}\mathrm{In}_{83}$

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First observation of $γ$ rays emitted from excited states south-east of ${}^{132}{Sn}$ : The $π g_{9 / 2}^{- 1} \otimes ν f_{7 / 2}$ multiplet of ${}^{132}{In}_{83}$

A. Jungclaus et al.

Phys. Rev. C 93, 041301(R) – Published 7 April 2016

Abstract

For the first time, the $γ$ decay of excited states has been observed in a nucleus situated in the quadrant south-east of doubly magic ${}^{132}{Sn}$ , a region in which experimental information so far is limited to ground-state properties. Six $γ$ rays with energies of 50, 86, 103, 227, 357, and 602 keV were observed following the $β$ -delayed neutron emission from ${}^{133}{Cd}_{85}$ , populated in the projectile fission of a ${}^{238}U$ beam at the Radioactive Isotope Beam Factory at RIKEN within the EURICA project. The new experimental information is compared to the results of a modern realistic shell-model calculation, the first one in this region very far from stability, focusing in particular on the $π 0 g_{9 / 2}^{- 1} \otimes ν 1 f_{7 / 2}$ particle-hole multiplet in ${}^{132}{In}_{83}$ . In addition, theoretical estimates based on a scaling of the two-body matrix elements for the $π h_{11 / 2}^{- 1} \otimes ν g_{9 / 2}$ analog multiplet in ${}^{208}{Tl}_{127}$ , one major proton and one major neutron shell above, are presented.