Structure of the N=50 As, Ge, Ga nuclei

doi:10.1016/j.nuclphysa.2012.08.007

Nuclear Physics A

Volume 893, 2 November 2012, Pages 1-12

https://doi.org/10.1016/j.nuclphysa.2012.08.007 Get rights and content

Abstract

The level structures of the $N = 50$ ⁸³As, ⁸²Ge, and ⁸¹Ga isotones have been investigated by means of multi-nucleon transfer reactions. A first experiment was performed with the CLARA–PRISMA setup to identify these nuclei. A second experiment was carried out with the GASP array in order to deduce the γ-ray coincidence information. The results obtained on the high-spin states of such nuclei are used to test the stability of the $N = 50$ shell closure in the region of ⁷⁸Ni ( $Z = 28$ ). The comparison of the experimental level schemes with the shell-model calculations yields an $N = 50$ energy gap value of 4.7(3) MeV at $Z = 28$ . This value, in a good agreement with the prediction of the finite-range liquid-drop model as well as with the recent large-scale shell model calculations, does not support a weakening of the $N = 50$ shell gap down to $Z = 28$ .

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Nuclear Physics A

Abstract

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Nuclear structure advancements with multi-nucleon transfer reactions