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Report No.

Low-energy states in $$^{79}$$Zn and the structure of $$^{78}$$Ni

Orlandi, R.; M$"u$cher, D.*; Raabe, R.*; Jungclaus, A.*; Pain, S. D.*; Bildstein, V.*; Chapman, R.*; de Angelis, G.*; Johansen, J. G.*; Van Duppen, P.*; Andreyev, A. N.*; Bottoni, S.*; Cocolios, T. E.*; De Witte, H.*; Diriken, J.*; Elseviers, J.*; Flavigny, F.*; Gaffney, L. P.*; Gernh$"a$user, R.*; Gottardo, A.*; Huyse, M.*; Illana, A.*; Konki, J.*; Kr$"o$ll, T.*; Kr$"u$cken, R.*; Lane, J. F. W.*; Liberati, V.*; Marsh, B.*; Nowak, K.*; Nowacki, F.*; Pakarinen, J.*; Rapisarda, E.*; Recchia, F.*; Reiter, P.*; Roger, T.*; Sahin, E.*; Seidlitz, M.*; Sieja, K.*; Smith, J. F.*; Valiente-Dob$'o$n, J. J.*; von Schmid, M.*; Voulot, D.*; Warr, N.*; Wenander, F. K.*; Wimmer, K.*

Single-neutron states in the $$N$$ = 49 isotope $$^{79}$$Zn were populated in the $$^{78}$$Zn(d,p)$$^{79}$$Zn transfer reaction at REX-ISOLDE, CERN. The combined detection of protons ejected in the reaction and of $$gamma$$ rays emitted by $$^{79}$$Zn permitted the identification of the lowest-lying 5/2$$^+$$ and 1/2$$^+$$ excited states. The analysis of proton angular distributions links these states to a significant amount of single-particle strength around 1 MeV, and specifically to the $$nu$$d$$_{5/2}$$ and $$nu$$s$$_{1/2}$$ neutron orbits, which lie above the $$N$$ = 50 neutron shell gap. Comparison with large-scale-shell-model calculations supports a robust $$N$$ = 50 shell-closure for $$^{78}$$Ni. These data constitute a considerable step towards the understanding of the magicity of $$^{78}$$Ni and of the structure of isotopes in the region.



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