Properties of shape-driving orbitals: Rotational bands in La131

L. Hildingsson, C. W. Beausang, D. B. Fossan, R. Ma, E. S. Paul, W. F. Piel, Jr., and N. Xu
Phys. Rev. C 39, 471 – Published 1 February 1989
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Abstract

Several rotational bands have been populated in La131 via the Cd116(19F, 4) fusion-evaporation reaction. Bands built on low-lying h11/2, g7/2, and d5/2 proton states have been identified. At higher spins, both proton and neutron [h11/2]2 alignments have been observed. While the proton alignment from low-Ω orbitals maintains a prolate nuclear shape, the alignment of high-Ω neutrons drives the nucleus to a collectively rotating oblate shape (γ∼-60°). The results are interpreted in the framework of the cranked shell model. In addition, B(M1;I→I-1)/B(E2;I→I-2) ratios have been extracted for several of the bands and the results compared to a semiclassical model to identify the detailed structure.

  • Received 12 October 1988

DOI:https://doi.org/10.1103/PhysRevC.39.471

©1989 American Physical Society

Authors & Affiliations

L. Hildingsson

  • Research Institute of Physics, S 104 05 Stockholm 50, Sweden

C. W. Beausang, D. B. Fossan, R. Ma, E. S. Paul, W. F. Piel, Jr., and N. Xu

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

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Vol. 39, Iss. 2 — February 1989

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