High-spin states in sup 136 Ce: Systematics of collective oblate rotation
- Department of Physics, State University of New York at Stony Brook, Stony Brook, New York 11794 (USA)
- Department of Physics, University of York, Heslington, York Y01 5DD, United Kingdom (GB)
- 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), Vol. 41:4; ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CERIUM 136
HIGH SPIN STATES
OXYGEN 18 REACTIONS
COMPOUND-NUCLEUS REACTIONS
TIN 122 TARGET
ANGULAR DISTRIBUTION
COINCIDENCE SPECTROMETRY
ENERGY LEVELS
ROTATIONAL STATES
CERIUM ISOTOPES
CHARGED-PARTICLE REACTIONS
DISTRIBUTION
EVEN-EVEN NUCLEI
EXCITED STATES
HEAVY ION REACTIONS
INTERMEDIATE MASS NUCLEI
ISOTOPES
NUCLEAR REACTIONS
NUCLEI
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
STABLE ISOTOPES
TARGETS
651720* - Nuclear Properties & Reactions
A=90-149
Experimental