Collective band structures in the. gamma. -soft nucleus /sup 135/Nd

Journal Article · Sat Feb 28 23:00:00 EST 1987 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.35.959· OSTI ID:6923391

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

The low-lying band structure of /sup 135/Nd has been extended to higher spins using the /sup 112/Cd(/sup 27/Al,p3n..gamma..)/sup 135/Nd and /sup 116/Sn(/sup 24/Mg,2p3n..gamma..)/sup 135/Nd reactions. Two distinct high-spin structures have been identified. The ..delta..J = 1 band built on the ..nu..h/sub 11/2/(514)(9/2)/sup -/ ground state was observed to have a band crossing at J/sup ..pi../ = (25/2)/sup -/. 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 h/sub 11/2/ 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 ..delta..J = 1 band structure with no signature splitting was observed to be built on a J/sup ..pi../ = (17/2)/sup (+)/ 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 ..delta..J = 1 band, which is thought to be based on a ..nu..h/sub 11/2/x..pi..h/sub 11/2/x..pi..g/sub 7/2/ three-quasiparticle configuration.

• Research Organization: Physics Department, State University of New York at Stony Brook, Stony Brook, New York 11794
• OSTI ID: 6923391
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 35:3; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

653001* -- Nuclear Theory-- Nuclear Structure
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CRANKING MODEL
ENERGY LEVELS
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NEODYMIUM ISOTOPES
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NUCLEAR STRUCTURE
NUCLEI
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