Shell evolution beyond Z = 28 and N = 50: Spectroscopy of 81,82,83,84 Zn

作者：C.M. Shand, Zs. Podolyák, M. Górska, P. Doornenbal, A. Obertelli, F. Nowacki, T. Otsuka, K. Sieja, J. A. Tostevin, Y. Tsunoda, G. Authelet, H. Baba, D. Calvet, A. Château, Shasha Chen, A. Corsi, A. Delbart, J.-M. Gheller, A. Giganon, A. Gillibert, T. Isobe, V. Lapoux, M. Matsushita, S. Momiyama, T. Motobayashi, M. Nııkura, H. Otsu, N. Paul, Clara Péron, A. Peyaud, E. Pollacco, J.-Y. Roussé, H. Sakuraï, C. Santamaria, M. Sasano, Yoshinori Shiga, D. Steppenbeck, Satoshi Takeuchi, R. Taniuchi, Т. Уесака, H. Wang, K. Yoneda, Takashi Ando, T. Arıcı, A. Blazhev, F. Browne, A. M. Bruce, R. Carroll, L. X. Chung, M. L. Cortés, M. Dewald, B. Ding, Zs. Dombrádi, F. Flavigny, S. Franchoo, F. Giacoppo, A. Gottardo, K. Hadyńska-Klęk, A. Jungclaus, Z. Korkulu, S. Koyama, Y. Kubota, Jeehyun Lee, M. Lettmann, B. D. Linh, J. Liu, Zihui Liu, C. Lizarazo, C. Louchart, R. Lozeva, K. Matsui, T. Miyazaki, K. Moschner, M. Nagamine, N. Nakatsuka, S. Nishimura, C.R. Nita, C.R. Nobs, L. Olivier, S. Ota, R. Orlandi, Z. Patel, P. H. Regan, M. Rüdigier, E. Şahin, T. Saito, P.-A. Söderström, I. Stefan, T. Sumikama, D. Suzuki, Zs. Vajta, V. Vaquero, V. Werner, K. Wimmer, J. Wu, Z. Y. Xu · 发表于：Physics Letters B · 年份：2017 · DOI：10.1016/j.physletb.2017.09.001 · 被引用次数：39 · 研究领域：Nuclear physics research studies、Nuclear Physics and Applications、Atomic and Molecular Physics

We report on the measurement of new low-lying states in the neutron-rich 81,82,83,84 Zn nuclei via in-beam γ -ray spectroscopy. These include the 4 1 + → 2 1 + transition in 82 Zn, the 2 1 + → 0 g . s . + and 4 1 + → 2 1 + transitions in 84 Zn, and low-lying states in 81,83 Zn were observed for the first time. The reduced E ( 2 1 + ) energies and increased E ( 4 1 + ) / E ( 2 + 1 ) ratios at N = 52 , 54 compared to those in 80 Zn attest that the magicity is confined to the neutron number N = 50 only. The deduced level schemes are compared to three state-of-the-art shell model calculations and a good agreement is observed with all three calculations. The newly observed 2 + and 4 + levels in 84 Zn suggest the onset of deformation towards heavier Zn isotopes, which has been incorporated by taking into account the upper sdg orbitals in the Ni78-II and the PFSDG-U models.