High-spin states in sup 136 Ce: Systematics of collective oblate rotation

Journal Article · Sat Mar 31 23:00:00 EST 1990 · Physical Review, C (Nuclear Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevC.41.1576· OSTI ID:7001463

Paul, E S; Fossan, D B; Liang, Y; Ma, R; Xu, N ^[1]; Wadsworth, R ^[2]; Jenkins, I; Nolan, P J ^[3]

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1. Department of Physics, State University of New York at Stony Brook, Stony Brook, New York 11794 (USA)
2. Department of Physics, University of York, Heslington, York Y01 5DD, United Kingdom (GB)
3. Oliver Lodge Laboratory, University of Liverpool, P.O. Box 147, Liverpool L69 3BX, United Kingdom (GB)

The level structure of the transitional even-even {sup 136}Ce nucleus has been investigated using the {sup 122}Sn({sup 18}O, 4{ital n}{gamma}) reaction. The prominent structure observed at high spin is a {Delta}{ital I}=1 rotational band, populated with {similar to}25% intensity of the 2{sup +}{r arrow}0{sup +} transition, which has a low dynamic moment of inertia {lt}20{h bar}{sup 2} MeV{sup {minus}1} for frequencies below {h bar}{omega}=0.45 MeV. This band is interpreted in terms of a two-quasiproton-two-quasineutron configuration with a shape close to the collectively rotating {gamma}={minus}60{degree} oblate shape, and is related to the oblate {pi}{ital h}{sub 11/2}{direct product}({nu}{ital h}{sub 11/2}){sup 2} configuration seen in several nearby odd-{ital Z} nuclei. The systematics of such oblate rotational bands in this mass region are discussed. Other {Delta}{ital I}=2 bands, built on states including {ital h}{sub 11/2} quasineutron orbitals, are also associated with collective oblate rotation. In addition, tentative evidence is presented for a weak band ({lt}2% intensity), showing an enhanced dynamic moment of inertia {similar to}57{h bar}{sup 2} MeV{sup {minus}1}, built on the highly deformed ({nu}{ital i}{sub 13/2}){sup 2} prolate configuration.

• OSTI ID: 7001463
• Journal Information: Physical Review, C (Nuclear Physics); (USA), Journal Name: Physical Review, C (Nuclear Physics); (USA) Vol. 41:4; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651720* -- Nuclear Properties & Reactions
A=90-149
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
CERIUM 136
CERIUM ISOTOPES
CHARGED-PARTICLE REACTIONS
COINCIDENCE SPECTROMETRY
COMPOUND-NUCLEUS REACTIONS
DISTRIBUTION
ENERGY LEVELS
EVEN-EVEN NUCLEI
EXCITED STATES
HEAVY ION REACTIONS
HIGH SPIN STATES
INTERMEDIATE MASS NUCLEI
ISOTOPES
NUCLEAR REACTIONS
NUCLEI
OXYGEN 18 REACTIONS
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
ROTATIONAL STATES
STABLE ISOTOPES
TARGETS
TIN 122 TARGET