Shape Coexistence in Light Se Isotopes: Evidence for Oblate Shapes

Journal Article · Fri Mar 14 04:00:00 EDT 2008 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.100.102502· OSTI ID:21123734

Ljungvall, J; Goergen, A; Dossat, C; Korten, W; Obertelli, A; Theisen, Ch; Zielinska, M ^[1]; Girod, M; Delaroche, J -P ^[2]; Dewald, A; Melon, B; Pissulla, T; Zell, K O ^[3]; Farnea, E; Menegazzo, R; Ur, C A ^[4]; Orlandi, R; Singh, R P; Valiente-Dobon, J J ^[5]; Petkov, P ^[3]

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1. CEA-Saclay, DAPNIA/SPhN, F-91191 Gif-sur-Yvette Cedex (France)
2. CEA-DIF, DPTA/SPN, Bruyeres-le-Chatel, F-91297 Arpajon Cedex (France)
3. Institut fuer Kernphysik, Universitaet zu Koeln, D-50937 Koeln (Germany)
4. INFN Sezione di Padova, I-35131 Padova (Italy)
5. INFN-Laboratori Nazionali di Legnaro, I-35020 Legnaro (Italy)

Lifetimes of states in the ground-state bands of {sup 70}Se and {sup 72}Se were measured using the recoil-distance Doppler shift method. The results deviate significantly from earlier measurements, requiring a revision of the conclusions drawn from a recent Coulomb excitation experiment concerning the shape of {sup 70}Se. The new results lead to a coherent picture of shape coexistence in the neutron-deficient selenium and krypton isotopes. The coexistence and evolution of oblate and prolate shapes in this mass region is for the first time consistently described by new Hartree-Fock-Bogolyubov-based configuration-mixing calculations which were performed using the Gogny D1S interaction.

• OSTI ID: 21123734
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 10 Vol. 100; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CONFIGURATION MIXING
COULOMB EXCITATION
DOPPLER EFFECT
GROUND STATES
HARTREE-FOCK METHOD
KRYPTON ISOTOPES
LIFETIME
MASS
NEUTRON-DEFICIENT ISOTOPES
SELENIUM 70
SELENIUM 72