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

Kelsall, NS; Fischer, SM; Balamuth, DP; Ball, GC; Carpenter, MP; Clark, RM; Durell, J; Fallon, P; Freeman, SJ and Hausladen, PA, et al. (2002) In Physical Review C (Nuclear Physics) 65(4).
Abstract
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... (More)
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. (Less)
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Physical Review C (Nuclear Physics)
volume
65
issue
4
publisher
American Physical Society
external identifiers
  • wos:000175186200052
ISSN
0556-2813
DOI
10.1103/PhysRevC.65.044331
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English
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5656f112-45ed-472c-9b4a-ededac4c0797 (old id 910044)
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2008-01-23 11:33:51
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@article{5656f112-45ed-472c-9b4a-ededac4c0797,
  abstract     = {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.},
  articleno    = {044331},
  author       = {Kelsall, NS and Fischer, SM and Balamuth, DP and Ball, GC and Carpenter, MP and Clark, RM and Durell, J and Fallon, P and Freeman, SJ and Hausladen, PA and Janssens, RVF and Jenkins, DG and Leddy, MJ and Lister, CJ and Macchiavelli, AO and Sarantites, DG and Schmidt, DC and Seweryniak, D and Svensson, CE and Varley, BJ and Vincent, S and Wadsworth, R and Wilson, AN and Afanasjev, AV and Frauendorf, S and Ragnarsson, Ingemar and Wyss, R},
  issn         = {0556-2813},
  language     = {eng},
  number       = {4},
  publisher    = {American Physical Society},
  series       = {Physical Review C (Nuclear Physics)},
  title        = {Testing mean-field models near the N=Z line: gamma-ray spectroscopy of the T-z=1/2 nucleus Kr-73},
  url          = {http://dx.doi.org/10.1103/PhysRevC.65.044331},
  volume       = {65},
  year         = {2002},
}