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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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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review C (Nuclear Physics)
volume
65
issue
4
article number
044331
publisher
American Physical Society
external identifiers
  • wos:000175186200052
  • scopus:85035287045
ISSN
0556-2813
DOI
10.1103/PhysRevC.65.044331
language
English
LU publication?
yes
additional info
The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Mathematical Physics (Faculty of Technology) (011040002)
id
5656f112-45ed-472c-9b4a-ededac4c0797 (old id 910044)
date added to LUP
2016-04-01 16:15:57
date last changed
2022-02-12 20:58:08
@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.}},
  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}},
  doi          = {{10.1103/PhysRevC.65.044331}},
  volume       = {{65}},
  year         = {{2002}},
}