Shape coexistence in Ba132

E. S. Paul, D. B. Fossan, Y. Liang, R. Ma, and N. Xu
Phys. Rev. C 40, 1255 – Published 1 September 1989
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Abstract

Rotational states have been populated in γ-soft Ba132 following the Sn122(13C,3) reaction. The ground state of this nucleus is predicted to possess maximal triaxiality γ∼-30°. Two ΔI=2 bands were established, based on quasineutron configurations with large negative γ deformations close to the collective oblate shape γ=-60°. The bandhead of one of these bands, associated with a [νh11/2]2 configuration, was found to be isomeric with a mean lifetime τ=12.5±0.3 ns. A third ΔI=2 band was observed, built on a two-quasiproton configuration with a near-prolate shape (γ∼0°). In addition, two ΔI=1 bands, built on mixed proton-neutron four-quasiparticle configurations with oblate shapes (γ∼-60°), were established.

  • Received 15 May 1989

DOI:https://doi.org/10.1103/PhysRevC.40.1255

©1989 American Physical Society

Authors & Affiliations

E. S. Paul, D. B. Fossan, Y. Liang, R. Ma, and N. Xu

  • Department of Physics, State University of New York at Stony Brook, Stony Brook, New York 11794

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Issue

Vol. 40, Iss. 3 — September 1989

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