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1p3/2 proton-hole state in Sn 132 and the shell structure along N=82

  • J. Taprogge
  • , A. Jungclaus*
  • , H. Grawe
  • , S. Nishimura
  • , P. Doornenbal
  • , G. Lorusso
  • , G. S. Simpson
  • , P. A. Söderström
  • , T. Sumikama
  • , Z. Y. Xu
  • , H. Baba
  • , F. Browne
  • , N. Fukuda
  • , R. Gernhäuser
  • , G. Gey
  • , N. Inabe
  • , T. Isobe
  • , H. S. Jung
  • , D. Kameda
  • , G. D. Kim
  • Y. K. Kim, I. Kojouharov, T. Kubo, N. Kurz, Y. K. Kwon, Z. Li, H. Sakurai, H. Schaffner, K. Steiger, H. Suzuki, H. Takeda, Zs Vajta, H. Watanabe, J. Wu, A. Yagi, K. Yoshinaga, G. Benzoni, S. Bönig, K. Y. Chae, L. Coraggio, A. Covello, J. M. Daugas, F. Drouet, A. Gadea, A. Gargano, S. Ilieva, F. G. Kondev, T. Kröll, G. J. Lane, A. Montaner-Pizá, K. Moschner, D. Mücher, F. Naqvi, M. Niikura, H. Nishibata, A. Odahara, R. Orlandi, Z. Patel, Zs Podolyák, A. Wendt
*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    59 Citations (Scopus)

    Abstract

    A low-lying state in In82131, the one-proton hole nucleus with respect to double magic Sn132, was observed by its γ decay to the Iπ=1/2- β-emitting isomer. We identify the new state at an excitation energy of Ex=1353keV, which was populated both in the β decay of Cd13183 and after β-delayed neutron emission from Cd13284, as the previously unknown πp3/2 single-hole state with respect to the Sn132 core. Exploiting this crucial new experimental information, shell-model calculations were performed to study the structure of experimentally inaccessible N=82 isotones below Sn132. The results evidence a surprising absence of proton subshell closures along the chain of N=82 isotones. The consequences of this finding for the evolution of the N=82 shell gap along the r-process path are discussed.

    Original languageEnglish
    Article number132501
    JournalPhysical Review Letters
    Volume112
    Issue number13
    DOIs
    Publication statusPublished - 1 Apr 2014

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