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APS » Journals » Phys. Rev. C » Volume 67 » Issue 2
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Phys. Rev. C 67, 021301(R) (2003) [5 pages]

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

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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

Received 23 August 2002; published 28 February 2003

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]3/2⊗ν[312]3/2 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.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.67.021301
DOI:
10.1103/PhysRevC.67.021301
PACS:
21.30.Fe, 21.10.Re, 21.60.Ev, 27.50.+e
 
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