1p(3/2) Proton-Hole State in Sn-132 and the Shell Structure Along N=82

Taprogge, J; Jungclaus, A; Grawe, H; Nishimura, S; Doornenbal, P; Lorusso, G; Simpson, GS; Soederstroem, P-A; Sumikama, T; Xu, ZY; Baba, H; Browne, F; Fukuda, N; Gernhaeuser, R; Gey, G; Inabe, N; Isobe, T; Jung, HS; Kameda, D; Kim, GD; Kim, Y-K; Kojouharov, I; Kubo, T; Kurz, N; Kwon, YK; Li, Z; Sakurai, H; Schaffner, H; Steiger, K; Suzuki, H; Takeda, H; Vajta, Zs; Watanabe, H; Wu, J; Yagi, A; Yoshinaga, K; Benzoni, G; Boenig, S; Chae, KY; Coraggio, L; Covello, A; Daugas, J-M; Drouet, F; Gadea, A; Gargano, A; Ilieva, S; Kondev, FG; Kroell, T; Lane, GJ; Montaner-Piza, A; Moschner, K; Muecher, D; Naqvi, F; Niikura, M; Nishibata, H; Odahara, A; Orlandi, Riccardo; Patel, Z; Podolyak, Zs; Wendt, A

doi:10.1103/PhysRevLett.112.132501

1p(3/2) Proton-Hole State in Sn-132 and the Shell Structure Along N=82

Author:

Taprogge, J

Jungclaus, A ; Grawe, H ; Nishimura, S ; Doornenbal, P ; Lorusso, G ; Simpson, GS ; Soederstroem, P-A ; Sumikama, T ; Xu, ZY ; Baba, H ; Browne, F ; Fukuda, N ; Gernhaeuser, R ; Gey, G ; Inabe, N ; Isobe, T ; Jung, HS ; Kameda, D ; Kim, GD ; Kim, Y-K ; Kojouharov, I ; Kubo, T ; Kurz, N ; Kwon, YK ; Li, Z ; Sakurai, H ; Schaffner, H ; Steiger, K ; Suzuki, H ; Takeda, H ; Vajta, Zs ; Watanabe, H ; Wu, J ; Yagi, A ; Yoshinaga, K ; Benzoni, G ; Boenig, S ; Chae, KY ; Coraggio, L ; Covello, A ; Daugas, J-M ; Drouet, F ; Gadea, A ; Gargano, A ; Ilieva, S ; Kondev, FG ; Kroell, T ; Lane, GJ ; Montaner-Piza, A ; Moschner, K ; Muecher, D ; Naqvi, F ; Niikura, M ; Nishibata, H ; Odahara, A ; Orlandi, Riccardo ; Patel, Z ; Podolyak, Zs ; Wendt, A

Keywords:

Science & Technology, Physical Sciences, Physics, Multidisciplinary, Physics, NUCLEAR-STRUCTURE, 01 Mathematical Sciences, 02 Physical Sciences, 09 Engineering, General Physics, 40 Engineering, 49 Mathematical sciences, 51 Physical sciences

Abstract:

A low-lying state in 131In82, the one-proton hole nucleus with respect to double magic 132Sn, was observed by its γ decay to the Iπ ¼ 1=2− β-emitting isomer. We identify the new state at an excitation energy of Ex ¼ 1353 keV, which was populated both in the β decay of 131Cd83 and after β-delayed neutron emission from 132Cd84, as the previously unknown πp3=2 single-hole state with respect to the 132Sn core. Exploiting this crucial new experimental information, shell-model calculations were performed to study the structure of experimentally inaccessible N ¼ 82 isotones below 132Sn. The results evidence a surprising absence of proton subshell closures along the chain of N ¼ 82 isotones. The consequences of this finding for the evolution of the N ¼ 82 shell gap along the r-process path are discussed.