Band crossings in the γ-soft nucleus Nd136

E. S. Paul, C. W. Beausang, D. B. Fossan, R. Ma, W. F. Piel, Jr., P. K. Weng, and N. Xu
Phys. Rev. C 36, 153 – Published 1 July 1987
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Abstract

High-spin states have been populated in Nd136 using the Cd116(24Mg,4nγ)136Nd reaction. Several rotational bands have been observed based on two- and four-quasiparticle configurations. The ground-state band backbends sharply at a frequency ħω=0.34 MeV due to the alignment of a pair of h11/2 protons. Both signatures of a negative parity side band based on a πh11/2⊗πg7/2 configuration were observed to backbend at a frequency ħω=0.44 MeV, again due to the alignment of a pair of h11/2 protons. All these bands are prolate because of the stabilizing influence of the h11/2 quasiprotons on the γ-soft core. In addition to the h11/2 proton alignment in the ground-state band, a rotational band is observed built on a second 10+ state, which involves the alignment of a pair of h11/2 neutrons. An alignment of neutrons from the upper h11/2 midshell drives the nucleus towards a collectively rotating oblate (γ=-60°) shape. Both signatures of a band based on a νh11/2⊗νg7/2 configuration were observed, also possibly oblate. The observation of both neutron and proton low-frequency alignments is consistent with cranked-shell model calculations and theoretical estimates of the prolate-oblate energy difference for this nucleus.

  • Received 20 February 1987

DOI:https://doi.org/10.1103/PhysRevC.36.153

©1987 American Physical Society

Authors & Affiliations

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

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

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Vol. 36, Iss. 1 — July 1987

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