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Report No.
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Shell evolution beyond $$Z$$=28 and $$N$$=50; Spectroscopy of $$^{81,82,83,84}$$Zn

Shand, C. M.*; Podoly$'a$k, Zs.*; G$'o$rska, M.*; Doornenbal, P.*; Obertelli, A.*; Nowacki, F.*; Otsuka, T.*; Sieja, K.*; Tostevin, J. A.*; Tsunoda, T.*; Authelet, G.*; Baba, H.*; Calvet, D.*; Ch$^a$teau, A.*; Chen, S.*; Corsi, A.*; Delbart, A.*; Gheller, J. M.*; Giganon, A.*; Gillibert, A.*; Isobe, T.*; Lapoux, V.*; Matsushita, Masafumi*; Momiyama, S.*; Motobayashi, Toru*; Niikura, Megumi*; Otsu, Hideaki*; Paul, N.*; P$'e$ron, C.*; Peyaud, A.*; Pollacco, E. C.*; Rouss$'e$, J.-Y.*; Sakurai, Hiroyoshi*; Santamaria, C.*; Sasano, M.*; Shiga, Y.*; Steppenbeck, D.*; Takeuchi, Satoshi*; Taniuchi, R.*; Uesaka, T.*; Wang, H.*; Yoneda, Akira*; Ando, T.*; Arici, T.*; Blazhev, A.*; Browne, F.*; Bruce, A. M.*; Carroll, R. J.*; Chung, L. X.*; Cort$'e$s, M. L.*; Dewald, M.*; Ding, B.*; Dombr$'a$di, Zs.*; Flavigny, F.*; Franchoo, S.*; Giacoppo, F.*; Gottardo, A.*; Hady$'n$ska-Kl$c{e}$k, K.*; Jungclaus, A.*; Korkulu, Z.*; Koyama, S.*; Kubota, Y.*; Lee, J.*; Lettmann, M.*; Linh, B. D.*; Liu, J.*; Liu, Z.*; Lizarazo, C.*; Louchart, C.*; Lozeva, R.*; Matsui, K.*; Miyazaki, T.*; Moschner, K.*; Nagamine, M.*; Nakatsuka, N.*; Nishimura, Shunji*; Nita, C. R.*; Nobs, C. R.*; Olivier, L.*; Ota, S.*; Orlandi, R.; Patel, Z.*; Regan, P. H.*; Rudigier, M.*; $c{S}$ahin, E.*; Saito, T.*; S$"o$derstr$"o$m, P.-A.*; Stefan, I.*; Sumikama, Toshiyuki*; Suzuki, Daisuke*; Vajta, Zs.*; Vaquero, V.*; Werner, V.*; Wimmer, K.*; Wu, J.*; Xu, Z. Y.*

Low-lying states in neutron-rich $$^{81,82.83.84}$$Zn nuclei were measured for the first time via in-beam $$gamma$$-ray spectroscopy at RIKEN. These include the 4$$_1^+$$ to 2$$_1^+$$ in $$^{82}$$Zn and the 2$$_1^+$$ to 0$$_1^+$$ and 4$$_1^+$$ to 2$$_1^+$$ in $$^{84}$$Zn. The reduced E($$2^+$$) energies and increased E(4$$^+$$)/E(2$$^+$$) ratios at $$N$$=52,54 compared to $$^{80}$$Zn attest that the magicity is confined just on the neutron number $$N$$=50 only. The levels observed in $$^{84}$$Zn suggest the onset of deformation towards heavier Zn isotopes. The data were compared to state-of-the-art shell model calculations.

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