Shape coexistence in {sup 71}Br and the question of the ground-state spin of {sup 71}Kr

Journal Article · Mon Aug 01 04:00:00 EDT 2005 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.72.024321· OSTI ID:20698908

Fischer, S M; Anderson, T; Kerns, P; Mesoloras, G; Svelnys, D; Lister, C J; Balamuth, D P; Hausladen, P A; Sarantites, D G ^[1]

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1. Department of Physics, DePaul University, Chicago, Illinois 60614 (United States) and Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)

When the N=Z line approaches the proton dripline above {sup 56}Ni an increasing distortion of mirror symmetry is expected as the proton-rich partner becomes marginally bound. Urkedal and Hamamoto have considered {sup 71}Kr and suggest the distortion could lead to a different ground-state spin to its mirror partner {sup 71}Br, based on the reinterpretation of a {beta}-decay measurement. This would be a unique situation in T=1/2 nuclei. We have performed a new in-beam spectroscopic measurement of {sup 71}Br, following the {sup 40}Ca({sup 40}Ca,2{alpha}p) reaction at 160 MeV and using Gammasphere. Many new states have been found, with candidates for eight Nilsson bandheads below 1 MeV. Cross-linking decays tightly constrain most of the angular momentum assignments. The {sup 71}Kr {beta}-decay data, seen in the light of this new information on {sup 71}Br, support the original ground-state assignment of {sup 71}Kr as J{sup {pi}}=5/2{sup -}, as would be normally expected for the mirror partner of J{sup {pi}}=5/2{sup -} {sup 71}Br.

• OSTI ID: 20698908
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 2 Vol. 72; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BETA DECAY
BROMINE 71
CALCIUM 40 REACTIONS
CALCIUM 40 TARGET
GROUND STATES
KRYPTON 71
MEV RANGE
MIRROR NUCLEI
NICKEL 56
PROTONS
SPIN
SYMMETRY