Testing mean-field models near the N=Z line: gamma-ray spectroscopy of the T-z=1/2 nucleus Kr-73

Testing mean-field models near the N=Z line : gamma-ray spectroscopy of the T-z=1/2 nucleus Kr-73

QC 20100525
Excited states in the N=Z+1 nucleus Kr-73 have been investigated using the Ca-40(Ar-36,2pn) and Ca-40(Ca-40,alpha2pn) reactions at 145 and 160 MeV, respectively. gamma 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 Kr-72,Kr-74, 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.

Fischer, S. M. (author)
Balamuth, D. P. (author)
Ball, G. C. (author)
Carpenter, M. P. (author)
Clark, R. M. (author)
Durell, J. (author)
Fallon, P. (author)
Freeman, S. J. (author)
Hausladen, P. A. (author)
Janssens, R. V. F. (author)
Jenkins, D. G. (author)
Leddy, M. J. (author)
Lister, C. J. (author)
Macchiavelli, A. O. (author)
Sarantites, D. G. (author)
Schmidt, D. C. (author)
Seweryniak, D. (author)
Svensson, C. E. (author)
Varley, B. J. (author)
Vincent, S. (author)
Wadsworth, R. (author)
Wilson, A. N. (author)
Afanasjev, A. V. (author)
Frauendorf, S. (author)
Ragnarsson, IngemarLund University,Lunds universitet,Matematisk fysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Mathematical Physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)matf-ira (author)
Wyss, RamonKTH,Fysik(Swepub:kth)u1ayc3r9 (author)
Matematisk fysikFysiska institutionen (creator_code:org_t)

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