Stability of theN=50shell gap in the neutron-richRb,Br,Se, andGeisotones

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Abstract

The low- and medium-spin states of the $N=50$ neutron-rich, $_{37}^{87}\mathrm{Rb}$, $_{35}^{85}\mathrm{Br}$, $_{34}^{84}\mathrm{Se}$ and $_{32}^{82}\mathrm{Ge}$ isotones have been populated in deep-inelastic processes produced by the interaction of $460\phantom{\rule{0.3em}{0ex}}\mathrm{MeV}$ $^{82}\mathrm{Se}$ ions with a $^{192}\mathrm{Os}$ target. The subsequent $\ensuremath{\gamma}$ decay has been investigated at the Laboratori Nazionali di Legnaro using the GASP $\ensuremath{\gamma}$-ray detector array. The comparison of the experimentally observed excited states with shell-model calculations performed with and without neutron degrees of freedom has allowed the investigation of the role of the neutron-core breaking excitations and therefore of the $N=50$ shell gap. The inclusion of neutron configurations in the shell-model calculations results in an improved agreement between the experimental and calculated level energies at medium and high spin. These results highlight the considerable contribution of neutron-core particle-hole excitations across the $N=50$ shell gap to the level configurations. The overall agreement of the measured excited states with the shell-model predictions is indicative of the persistence of the $N=50$ shell gap down to $Z=32$.

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