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Ljungvall, J; Görgen, A; Girod, M; Delaroche, J-P; Dewald, A; Dossat, C; Farnea, E; Korten, W; Melon, B; Menegazzo, R; Obertelli, A; Orlandi, R; Petkov, P; Pissulla, T; Siem, S; Singh, R P; Srebrny, J; Theisen, C H; Ur, C A; Valiente-Dobón, J J; Zell, K O; Zielińska, M
Physical review letters, 03/2008, Letnik: 100, Številka: 10Journal Article
Lifetimes of states in the ground-state bands of (70)Se and (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 (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.
