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Pairing correlations in high-spin isomers

A. Odahara, Y. Gono, T. Fukuchi, Y. Wakabayashi, H. Sagawa, W. Satuła, and W. Nazarewicz
Phys. Rev. C 72, 061303(R) – Published 29 December 2005

Abstract

High-spin isomers with Jπ=49/2+ and 27+ have been systematically observed in a number of N=83 isotones with 60Z67 at excitation energies ~9 MeV. Based on experimental excitation energies, an odd-even binding energy staggering has been extracted for the first time for these multi-quasiparticle states. Surprisingly, the magnitude of the odd-even effect in high-spin isomers turned out to be very close to that in ground states, thus challenging conventional wisdom that pairing correlations are reduced in highly excited states. Theoretical analysis based on mean-field theory explains the observed proton number dependence of the odd-even effect as a manifestation of strong pairing correlations in the highly excited states. Mean-field effects and the proton-neutron residual interaction on the odd-even staggering are also examined.

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  • Received 14 June 2005

DOI:https://doi.org/10.1103/PhysRevC.72.061303

©2005 American Physical Society

Authors & Affiliations

A. Odahara1, Y. Gono2, T. Fukuchi3,4, Y. Wakabayashi2,3, H. Sagawa5, W. Satuła6, and W. Nazarewicz6,7,8

  • 1Nishinippon Institute of Technology, Kanda-tyo, Fukuoka-ken 800-0394, Japan
  • 2Department of Physics, Kyushu University, Hakozaki, Fukuoka 812-8581, Japan
  • 3Center for Nuclear Study (CNS), University of Tokyo, Wako, Saitama 351-0198, Japan
  • 4Department of Physics, Rikkyo University, Toshima, Tokyo 171-8501, Japan
  • 5Center for Mathematical Sciences, University of Aizu, Aizu-Wakamatsu, Fukushima 965-8580, Japan
  • 6Institute of Theoretical Physics, University of Warsaw, ul. Hoża 69, PL-00-681 Warsaw, Poland
  • 7Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
  • 8Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

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Issue

Vol. 72, Iss. 6 — December 2005

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