Persistence of the Z=28 Shell Gap Around Ni 78: First Spectroscopy of Cu 79

SEASTAR collaboration

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In-beam γ-ray spectroscopy of Cu79 is performed at the Radioactive Isotope Beam Factory of RIKEN. The nucleus of interest is produced through proton knockout from a Zn80 beam at 270 MeV/nucleon. The level scheme up to 4.6 MeV is established for the first time and the results are compared to Monte Carlo shell-model calculations. We do not observe significant knockout feeding to the excited states below 2.2 MeV, which indicates that the Z=28 gap at N=50 remains large. The results show that the Cu79 nucleus can be described in terms of a valence proton outside a Ni78 core, implying the magic character of the latter.

Original languageEnglish
Article number192501
Number of pages6
JournalPhysical Review Letters
Issue number19
Publication statusPublished - 6 Nov 2017

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