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

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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http://hal.in2p3.fr/in2p3-00735688
Contributor : Michel Lion <>
Submitted on : Wednesday, September 26, 2012 - 3:07:25 PM
Last modification on : Thursday, January 7, 2021 - 7:26:04 PM

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E. Sahin A, G. de Angelis, G. Duchene, T. Faul, A. Gadea, et al.. Structure of the N = 50 As, Ge, Ga nuclei. Nuclear Physics A, Elsevier, 2012, 893, pp.1-12. ⟨10.1016/j.nuclphysa.2012.08.007⟩. ⟨in2p3-00735688⟩

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