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Evidence for isovector neutron-proton pairing from high-spin states in N=Z74Rb

C. D. O’Leary, C. E. Svensson, S. G. Frauendorf, A. V. Afanasjev , D. E. Appelbe, R. A. E. Austin, G. C. Ball, J. A. Cameron, R. M. Clark, M. Cromaz, P. Fallon, D. F. Hodgson, N. S. Kelsall, A. O. Macchiavelli, I. Ragnarsson, D. Sarantites, J. C. Waddington, and R. Wadsworth
Phys. Rev. C 67, 021301(R) – Published 28 February 2003
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Abstract

High-spin states in the odd-odd N=Z nucleus 3774Rb37 were studied using the 40Ca(40Ca,αnp) reaction. A previously observed odd-spin T=0 band has been extended to Iπ=(31+) and an even-spin T=0 band has been observed for the first time to Iπ=(22+); both have a π(g9/2)ν(g9/2) structure. A strongly coupled low-spin T=0,K=3 band has been interpreted as being based upon a π[312]32ν[312]32 configuration. Cranked relativistic Hartree-Bogoliubov calculations, which are corrected for the t=1np-pair field by restoring isospin symmetry, reproduce the observed spectrum. These new results provide evidence for the existence of an isovector pair field that contains a neutron-proton component with the proper strength for ensuring isospin conservation.

  • Received 23 August 2002

DOI:https://doi.org/10.1103/PhysRevC.67.021301

©2003 American Physical Society

Authors & Affiliations

C. D. O’Leary1, C. E. Svensson2, S. G. Frauendorf3, A. V. Afanasjev 3,4,5, D. E. Appelbe6, R. A. E. Austin7, G. C. Ball8, J. A. Cameron7, R. M. Clark9, M. Cromaz9, P. Fallon9, D. F. Hodgson8, N. S. Kelsall1, A. O. Macchiavelli9, I. Ragnarsson10, D. Sarantites11, J. C. Waddington8, and R. Wadsworth1

  • 1Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom
  • 2Department of Physics, University of Guelph, Guelph, Ontario, Canada N1G 2W1
  • 3Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556
  • 4Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439
  • 5Laboratory of Radiation Physics, Institute of Solid State Physics, University of Latvia, LV 2169 Salaspils, Miera str. 31, Latvia
  • 6CLRC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, United Kingdom
  • 7Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1
  • 8TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, Canada V6T 2A3
  • 9Lawrence Berkeley National Laboratory, Berkeley, California 94720
  • 10Lund Institute of Technology, P.O. Box 118, S-221 00 Lund, Sweden
  • 11Department of Chemistry, Washington University, St. Louis, Missouri 63130

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Vol. 67, Iss. 2 — February 2003

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