Monopole-Driven Shell Evolution below the Doubly Magic Nucleus Sn 132 Explored with the Long-Lived Isomer in Pd 126

Watanabe, H; Lorusso, G; Nishimura, S; Otsuka, T; Ogawa, K; Xu, ZY; Sumikama, T; Söderström, P-A; Doornenbal, P; Li, Z; Browne, F; Gey, G; Jung, HS; Taprogge, J; Vajta, Zs; Wu, J; Yagi, A; Baba, H; Benzoni, G; Chae, KY; Crespi, FCL; Fukuda, N; Gernhäuser, R; Inabe, N; Isobe, T; Jungclaus, A; Kameda, D; Kim, GD; Kim, YK; Kojouharov, I; Kondev, FG; Kubo, T; Kurz, N; Kwon, YK; Lane, GJ; Moon, C-B; Montaner-Pizá, A; Moschner, K; Naqvi, F; Niikura, M; Nishibata, H; Nishimura, D; Odahara, A; Orlandi, R; Patel, Z; Podolyák, Zs; Sakurai, H; Schaffner, H; Simpson, GS; Steiger, K; Suzuki, H; Takeda, H; Wendt, A; Yoshinaga, K

doi:10.1103/PhysRevLett.113.042502

Monopole-Driven Shell Evolution below the Doubly Magic Nucleus Sn 132 Explored with the Long-Lived Isomer in Pd 126

Author:

Watanabe, H

Lorusso, G ; Nishimura, S ; Otsuka, T ; Ogawa, K ; Xu, ZY ; Sumikama, T ; Söderström, P-A ; Doornenbal, P ; Li, Z ; Browne, F ; Gey, G ; Jung, HS ; Taprogge, J ; Vajta, Zs ; Wu, J ; Yagi, A ; Baba, H ; Benzoni, G ; Chae, KY ; Crespi, FCL ; Fukuda, N ; Gernhäuser, R ; Inabe, N ; Isobe, T ; Jungclaus, A ; Kameda, D ; Kim, GD ; Kim, YK ; Kojouharov, I ; Kondev, FG ; Kubo, T ; Kurz, N ; Kwon, YK ; Lane, GJ ; Moon, C-B ; Montaner-Pizá, A ; Moschner, K ; Naqvi, F ; Niikura, M ; Nishibata, H ; Nishimura, D ; Odahara, A ; Orlandi, R ; Patel, Z ; Podolyák, Zs ; Sakurai, H ; Schaffner, H ; Simpson, GS ; Steiger, K ; Suzuki, H ; Takeda, H ; Wendt, A ; Yoshinaga, K

Keywords:

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

Abstract:

A new isomer with a half-life of 23.0(8) ms has been identified at 2406 keV in (126)Pd and is proposed to have a spin and parity of 10(+) with a maximally aligned configuration comprising two neutron holes in the 1h(11/2) orbit. In addition to an internal-decay branch through a hindered electric octupole transition, β decay from the long-lived isomer was observed to populate excited states at high spins in (126)Ag. The smaller energy difference between the 10(+) and 7(-) isomers in (126)Pd than in the heavier N=80 isotones can be interpreted as being ascribed to the monopole shift of the 1h(11/2) neutron orbit. The effects of the monopole interaction on the evolution of single-neutron energies below (132)Sn are discussed in terms of the central and tensor forces.