Single-neutron states in the Z=30, N=49 isotope 79Zn have been populated using the 78Zn(d, p)79Zn transfer reaction at REX-ISOLDE, CERN. The experimental setup allowed the combined detection of protons ejected in the reaction, and of γ rays emitted by 79Zn. The analysis reveals that the lowest excited states populated in the reaction lie at approximately 1 MeV of excitation, and involve neutron orbits above the N=50 shell gap. From the analysis of γ-ray data and of proton angular distributions, characteristic of the amount of angular momentum transferred, a 5/2+ configuration was assigned to a state at 983 keV. Comparison with large-scale-shell-model calculations supports a robust neutron N=50 shell-closure for 78Ni. These data constitute an important step towards the understanding of the magicity of 78Ni and of the structure of nuclei in the region.
Single-neutron orbits near Ni-78: Spectroscopy of the N=49 isotope Zn-79 / R. Orlandi, D. Mücher, R. Raabe, A. Jungclaus, S.D. Pain, V. Bildstein, R. Chapman, G. de Angelis, J.G. Johansen, P. Van Duppen, A.N. Andreyev, S. Bottoni, T.E. Cocolios, H. De Witte, J. Diriken, J. Elseviers, F. Flavigny, L.P. Gaffney, R. Gernhäuser, A. Gottardo, M. Huyse, A. Illana, J. Konki, T. Kröll, R. Krücken, J.F.W. Lane, V. Liberati, B. Marsh, K. Nowak, F. Nowacki, J. Pakarinen, E. Rapisarda, F. Recchia, P. Reiter, T. Roger, E. Sahin, M. Seidlitz, K. Sieja, J.F. Smith, J.J. Valiente Dobón, M. von Schmid, D. Voulot, N. Warr, F.K. Wenander, K. Wimmer. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 740(2015), pp. 298-302. [10.1016/j.physletb.2014.12.006]
Single-neutron orbits near Ni-78: Spectroscopy of the N=49 isotope Zn-79
S. Bottoni;
2015
Abstract
Single-neutron states in the Z=30, N=49 isotope 79Zn have been populated using the 78Zn(d, p)79Zn transfer reaction at REX-ISOLDE, CERN. The experimental setup allowed the combined detection of protons ejected in the reaction, and of γ rays emitted by 79Zn. The analysis reveals that the lowest excited states populated in the reaction lie at approximately 1 MeV of excitation, and involve neutron orbits above the N=50 shell gap. From the analysis of γ-ray data and of proton angular distributions, characteristic of the amount of angular momentum transferred, a 5/2+ configuration was assigned to a state at 983 keV. Comparison with large-scale-shell-model calculations supports a robust neutron N=50 shell-closure for 78Ni. These data constitute an important step towards the understanding of the magicity of 78Ni and of the structure of nuclei in the region.
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