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

Kelsall, N. S. ; Fischer, S. M. ; Balamuth, D. P. ; Ball, G. C. ; Carpenter, M. P. ; Clark, R. M. ; Durell, J. ; Fallon, P. ; Freeman, S. J. and Hausladen, P. A. , et al. (2002) In Physical Review C - Nuclear Physics 65(4).
Abstract

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... (More)

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.

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publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review C - Nuclear Physics
volume
65
issue
4
article number
044331
pages
13 pages
publisher
American Physical Society
external identifiers
  • scopus:4243604917
ISSN
0556-2813
language
English
LU publication?
no
id
8fda1025-5a1f-4295-b97b-5266c6190deb
date added to LUP
2024-01-19 09:52:50
date last changed
2024-01-19 09:53:37
@article{8fda1025-5a1f-4295-b97b-5266c6190deb,
  abstract     = {{<p>Excited states in the N=Z+1 nucleus <sup>73</sup>Kr have been investigated using the <sup>40</sup>Ca(<sup>36</sup>Ar, 2pn) and <sup>40</sup>Ca(<sup>40</sup>Ca, 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 <sup>72,74</sup>Kr, 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.</p>}},
  author       = {{Kelsall, N. S. and Fischer, S. M. and Balamuth, D. P. and Ball, G. C. and Carpenter, M. P. and Clark, R. M. and Durell, J. and Fallon, P. and Freeman, S. J. and Hausladen, P. A. and Janssens, R. V.F. and Jenkins, D. G. and Leddy, M. J. and Lister, C. J. and Macchiavelli, A. O. and Sarantites, D. G. and Schmidt, D. C. and Seweryniak, D. and Svensson, C. E. and Varley, B. J. and Vincent, S. and Wadsworth, R. and Wilson, A. N. and Afanasjev, A. V. and Frauendorf, S. and Ragnarsson, I. 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 : γ-ray spectroscopy of the T<sub>z</sub>=1/2 nucleus <sup>73</sup>Kr}},
  volume       = {{65}},
  year         = {{2002}},
}