Phys. Rev. C 65, 044331 (2002) [13 pages]Testing mean-field models near the N=Z line: γ-ray spectroscopy of the Tz=1/2 nucleus 73KrReceived 6 December 2001; published 5 April 2002 Excited states in the N=Z+1 nucleus 73Kr have been investigated using the 40Ca(36Ar,2pn) and 40Ca(40Ca,α2pn) reactions at 145 and 160 MeV, respectively. γ rays were detected using the Gammasphere array and events were recorded in coincidence with charged-particle and neutron detectors. The three previously observed bands were extended to high spin, and a new unfavored positive-parity band has been observed. The alignment characteristics and decay properties of the bands are all consistent with large-deformation prolate rotation, with no clear evidence for oblate bands or shape coexistence. This is quite different from neighboring 72,74Kr, indicating a strong shape-stabilizing role for the valence neutron. The experimental results are compared to extended total Routhian surface, cranked Nilsson Strutinsky, and cranked relativistic mean-field calculations. The results suggest that the paired calculations lack some important physics. Neutron-proton correlations may be the missing ingredient. There is also evidence for an unusual band crossing in the negative-parity bands, which may indicate the presence of T=0 pairing correlations. At high spin all the models can reproduce the experimental data. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevC.65.044331
DOI:
10.1103/PhysRevC.65.044331
PACS:
21.10.Re, 21.60.-n, 23.20.Lv, 27.50.+e
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