Competition between pairing-assisted tunneling and single-particle alignment in the decay of high-K isomeric states

T. Bengtsson, R. A. Broglia, E. Vigezzi, F. Barranco, F. Dönau, and Jing-ye Zhang
Phys. Rev. Lett. 62, 2448 – Published 22 May 1989
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Abstract

In an axially symmetric, strongly rotating quadrupole deformed nucleus, the projection K of the angular momentum along the symmetry axis is a partially conserved quantity. A K isomer (K=25) at low excitation energy has been observed in Os182 which decays into the ground-state band (K=0). The associated electromagnetic lifetime at spin I≊25 can be interpreted in terms of tunneling of a system displaying strong pairing fluctuations across a barrier which separates configurations in which the nucleus rotates about the symmetry axis and about an axis perpendicular to it. A hindrance factor ≊106109 for the process is calculated, in overall agreement with the data.

  • Received 25 October 1988

DOI:https://doi.org/10.1103/PhysRevLett.62.2448

©1989 American Physical Society

Authors & Affiliations

T. Bengtsson, R. A. Broglia, E. Vigezzi, F. Barranco, F. Dönau, and Jing-ye Zhang

  • Department of Mathematical Physics, Lund Institute of Technology, Lund, Sweden
  • Dipartimento di Fisica, Università di Milano, and Sezione di Milano, INFN, Milano, Italy
  • The Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark
  • Escuela Superior de Ingenieros Industriales, Av. da Reina Mercedes, Sevilla, Spain
  • Zentralinstitut für Kernforschung, Rossendorf, 8051 Dresden, PSF 19, East Germany
  • Joint Institute of Heavy Ion Research, Holifield Heavy Ion Research Faculty, Oak Ridge, Tennessee 37831

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Vol. 62, Iss. 21 — 22 May 1989

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