Alignment effects in odd-mass Cs isotopes: Spectroscopy of sup 125 Cs

Journal Article · Sun Dec 01 04:00:00 EST 1991 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.44.2390· OSTI ID:5134305

Hughes, J R; Fossan, D B; LaFosse, D R; Liang, Y; Vaska, P; Waring, M P ^[1]

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1. Department of Physics, State University of New York at Stony Brook, Stony Brook, New York 11794 (United States)

Several rotational bands have been populated in the {ital Z}=55 nucleus {sup 125}Cs using the fusion evaporation reaction {sup 110}Pd({sup 19}F,4{ital n}), at a beam energy of 74 MeV. The resultant {gamma} rays were detected using standard {gamma}-ray spectroscopic techniques with an array of six Compton-suppressed Ge detectors and a fourteen-element bismuth-germanate ball. The low-lying yrast structure is found to be dominated by the unique parity {pi}{ital h}{sub 11/2} orbital, manifest as a decoupled band with a large signature splitting. A crossing occurs in this band at {h bar}{omega}{sub {ital c}}=0.42 MeV, which is interpreted as ({nu}{ital h}{sub 11/2}){sup 2} pair alignment. In addition, a strongly coupled negative-parity structure with large {ital B}({ital M}1)/{ital B}({ital E}2) ratios is observed feeding both signatures of the {pi}{ital h}{sub 11/2} band. Bands built on the normal-parity {pi}{ital g}{sub 7/2} and {pi}{ital g}{sub 9/2}{sup {minus}1} orbitals have also been confirmed and extended. These structures are compared to cranked-shell-model calculations and the systematics of the region.

• OSTI ID: 5134305
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 44:6; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALI METAL ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CESIUM 125
CESIUM ISOTOPES
COLLECTIVE MODEL
DEFORMATION
ELECTRON CAPTURE RADIOISOTOPES
ENERGY LEVELS
EXCITED STATES
GAMMA SPECTRA
INTERMEDIATE MASS NUCLEI
ISOTOPES
MATHEMATICAL MODELS
MINUTES LIVING RADIOISOTOPES
NUCLEAR DEFORMATION
NUCLEAR MODELS
NUCLEI
ODD-EVEN NUCLEI
RADIOISOTOPES
ROTATIONAL STATES
SPECTRA