Monopole-driven shell evolution below the doubly magic nucleus 132Sn explored with the long-lived isomer in 126Pd

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

doi:10.1103/PhysRevLett.113.042502

Monopole-driven shell evolution below the doubly magic nucleus 132Sn explored with the long-lived isomer in 126Pd

Phys Rev Lett. 2014 Jul 25;113(4):042502. doi: 10.1103/PhysRevLett.113.042502. Epub 2014 Jul 25.

Authors

H Watanabe¹, G Lorusso², S Nishimura², T Otsuka³, K Ogawa², Z Y Xu⁴, T Sumikama⁵, P-A Söderström², P Doornenbal², Z Li⁶, F Browne⁷, G Gey⁸, H S Jung⁹, J Taprogge¹⁰, Zs Vajta¹¹, J Wu¹², A Yagi¹³, H Baba², G Benzoni¹⁴, K Y Chae¹⁵, F C L Crespi¹⁶, N Fukuda², R Gernhäuser¹⁷, N Inabe², T Isobe², A Jungclaus¹⁸, D Kameda², G D Kim¹⁹, Y K Kim²⁰, I Kojouharov²¹, F G Kondev²², T Kubo², N Kurz²¹, Y K Kwon¹⁹, G J Lane²³, C-B Moon²⁴, A Montaner-Pizá²⁵, K Moschner²⁶, F Naqvi²⁷, M Niikura⁴, H Nishibata¹³, D Nishimura²⁸, A Odahara¹³, R Orlandi²⁹, Z Patel³⁰, Zs Podolyák³⁰, H Sakurai², H Schaffner²¹, G S Simpson³¹, K Steiger¹⁷, H Suzuki², H Takeda², A Wendt²⁶, K Yoshinaga²⁸

Affiliations

¹ IRCNPC, School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China and RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
² RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
³ Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan and Center for Nuclear Study, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
⁴ Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
⁵ Department of Physics, Tohoku University, Aoba, Sendai, Miyagi 980-8578, Japan.
⁶ Department of Physics, Peking University, Beijing 100871, China.
⁷ RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan and School of Computing Engineering and Mathematics, University of Brighton, Brighton, BN2 4GJ, United Kingdom.
⁸ RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan and LPSC, Université Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, F-38026 Grenoble Cedex, France.
⁹ Department of Physics, Chung-Ang University, Seoul 156-756, Republic of Korea.
¹⁰ RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan and Departamento de Física Teórica, Universidad Autónoma de Madrid, E-28049 Madrid, Spain and Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain.
¹¹ RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan and MTA Atomki, P.O. Box 51, Debrecen, H-4001, Hungary.
¹² RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan and Department of Physics, Peking University, Beijing 100871, China.
¹³ Department of Physics, Osaka University, Machikaneyama-machi 1-1, Osaka 560-0043 Toyonaka, Japan.
¹⁴ INFN, Sezione di Milano, via Celoria 16, I-20133 Milano, Italy.
¹⁵ Department of Physics, Sungkyunkwan University, Suwon 440-746, Republic of Korea.
¹⁶ INFN, Sezione di Milano, via Celoria 16, I-20133 Milano, Italy and Dipartimento di Fisica, Universitá di Milano, via Celoria 16, I-20133 Milano, Italy.
¹⁷ Physik Department, Technische Universität München, D-85748 Garching, Germany.
¹⁸ Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain.
¹⁹ Rare Isotope Science Project, Institute for Basic Science, Daejeon 305-811, Republic of Korea.
²⁰ Rare Isotope Science Project, Institute for Basic Science, Daejeon 305-811, Republic of Korea and Department of Nuclear Engineering, Hanyang University, Seoul 133-791, Republic of Korea.
²¹ GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany.
²² Nuclear Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
²³ Department of Nuclear Physics, R.S.P.E., Australian National University, Canberra, Australian Capital Territory 0200, Australia.
²⁴ Department of Display Engineering, Hoseo University, Chung-Nam 336-795, Republic of Korea.
²⁵ IFIC, CSIC-Universidad de Valencia, A.C. 22085, E 46071, Valencia, Spain.
²⁶ Institut für Kernphysik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany.
²⁷ Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520-8120, USA.
²⁸ Department of Physics, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, Japan.
²⁹ Instituut voor Kern en Stralingsfysica, KU Leuven, University of Leuven, B-3001 Leuven, Belgium.
³⁰ Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom.
³¹ LPSC, Université Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, F-38026 Grenoble Cedex, France.

PMID: 25105611
DOI: 10.1103/PhysRevLett.113.042502

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.