TY - JOUR
T1 - Testing mean-field models near the N=Z line: gamma-ray spectroscopy of the T-z=1/2 nucleus Kr-73
AU - Kelsall, NS
AU - Fischer, SM
AU - Balamuth, DP
AU - Ball, GC
AU - Carpenter, MP
AU - Clark, RM
AU - Durell, J
AU - Fallon, P
AU - Freeman, SJ
AU - Hausladen, PA
AU - Janssens, RVF
AU - Jenkins, DG
AU - Leddy, MJ
AU - Lister, CJ
AU - Macchiavelli, AO
AU - Sarantites, DG
AU - Schmidt, DC
AU - Seweryniak, D
AU - Svensson, CE
AU - Varley, BJ
AU - Vincent, S
AU - Wadsworth, R
AU - Wilson, AN
AU - Afanasjev, AV
AU - Frauendorf, S
AU - Ragnarsson, Ingemar
AU - Wyss, R
N1 - 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)
PY - 2002
Y1 - 2002
N2 - 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.
AB - 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.
U2 - 10.1103/PhysRevC.65.044331
DO - 10.1103/PhysRevC.65.044331
M3 - Article
SN - 0556-2813
VL - 65
JO - Physical Review C (Nuclear Physics)
JF - Physical Review C (Nuclear Physics)
IS - 4
M1 - 044331
ER -