Evidence for isovector neutron-proton pairing from high-spin states in N = Z 74Rb

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. Fallen, D. F. Hodgson, N. S. Kelsall, A. O. Macchiavelli, I. Ragnarsson, D. Sarantites, J. C. Waddington, R. Wadsworth

*Corresponding author for this work

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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 = 1 np-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.

Original languageEnglish
Pages (from-to)213011-213015
Number of pages5
JournalPhysical Review C - Nuclear Physics
Issue number2
Publication statusPublished - 1 Feb 2003

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