Collective band structures in the γ-soft nucleus Nd135

W. F. Piel, Jr., C. W. Beausang, D. B. Fossan, L. Hildingsson, and E. S. Paul
Phys. Rev. C 35, 959 – Published 1 March 1987
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Abstract

The low-lying band structure of Nd135 has been extended to higher spins using the Cd112(27Al,p3nγ)135Nd and Sn116(24Mg,2p3nγ)135Nd reactions. Two distinct high-spin structures have been identified. The ΔJ=1 band built on the νh11/2[514](9/2) ground state was observed to have a band crossing at Jπ=(25/2). This band crossing is associated with a loss of the moderate signature splitting found below the backbend. Cranked-shell model calculations suggest that this structure involves the alignment of a pair of h11/2 protons and that the loss of signature splitting can be attributed to a shape change from a triaxial shape at low spins to a prolate axial shape above the backbend. A second ΔJ=1 band structure with no signature splitting was observed to be built on a Jπ=(17/2)(+) state at 1954 keV. Values for the ratios of reduced transition rates B(M1; I →I-1)/B(E2; I→I-1) and B(M1; I→I-1)/B(E2; I→I-2) have been extracted from transitions in the two bands. Comparisons with theoretical predictions helped in the identification of the structure of the second ΔJ=1 band, which is thought to be based on a νh11/2⊗πh11/2⊗πg7/2 three-quasiparticle configuration.

  • Received 4 November 1986

DOI:https://doi.org/10.1103/PhysRevC.35.959

©1987 American Physical Society

Authors & Affiliations

W. F. Piel, Jr., C. W. Beausang, D. B. Fossan, L. Hildingsson, and E. S. Paul

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

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Vol. 35, Iss. 3 — March 1987

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