High-spin structures in /sup 137/Sm: Role of the. beta. -driving. nu. /ital i//sub 13/2/ intruder in deformation enhancement

Journal Article · Sat Jul 01 04:00:00 EDT 1989 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.40.156· OSTI ID:6013226

Ma, R; Beausang, C W; Paul, E S; Shi, S; Xu, N; Fossan, D B; Burde, J; Deleplanque, M A; Diamond, R M; others, and

Collective band structures have been observed in the neutron-deficient /sup 137/Sm nucleus by means of the /sup 104/Pd(/sup 37/Cl,/ital p/3/ital n/..gamma..) reaction. At lowspins, the yrast band, built on the ..nu../ital h//sub 11/2/(514)9/2/sup /minus// Nilsson orbital, exhibits a large signaturesplitting (/similar to/100 keV) consistent with a significant triaxial shape(..gamma../similar to//minus/20/degree/). At higher spins, two sidebands were observed whichare characterized by strong ..delta../ital I/=1 transitions and a lack ofsignature splitting. These band structures contain rotationally alignedlower-midshell /ital h//sub 11/2/ protons which drive the nucleustowards the prolate (..gamma..=0/degree/) shape. In addition, a decoupled bandwas observed built on an /ital I//sup ..pi../= (17/2/sup +/)state. This band reveals a 50% increase in the dynamic moment of inertiaconsistent with an enhanced quadrupole deformation (..beta../similar to/0.35),and is believed to be built on the ..beta..-driving..nu../ital i//sub 13/2/ (660)1/2/sup +/single-quasiparticle state, intruding from two harmonic oscillator shellsabove. The ..beta..-driving properties of this orbital represent an importantmechanism in the evolution of enhanced nuclear deformation in this region. Theresults are compared to those of the /ital N/=75 /sup 133/Ce,/sup 135/Nd, and /sup 139/Gd isotones.

• Research Organization: Department of Physics, State University of New York at Stony Brook, Stony Brook, New York 11794(US); Nuclear Science Division, Lawrence Berkeley Laboratory, University of California, Berkeley, Berkeley, California 94720
• OSTI ID: 6013226
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 40:1; 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 MOMENTUM
BARYONS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CERIUM 133
CERIUM ISOTOPES
CHARGED-PARTICLE REACTIONS
CHLORINE 37 REACTIONS
COMPOUND-NUCLEUS REACTIONS
DATA
DEFORMATION
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTARY PARTICLES
ENERGY LEVELS
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
FERMIONS
GADOLINIUM 139
GADOLINIUM ISOTOPES
HADRONS
HARMONIC OSCILLATOR MODELS
HEAVY ION REACTIONS
HIGH SPIN STATES
HOURS LIVING RADIOISOTOPES
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOTOPES
MATHEMATICAL MODELS
NEODYMIUM 135
NEODYMIUM ISOTOPES
NEUTRONS
NILSSON-MOTTELSON MODEL
NUCLEAR DEFORMATION
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
NUMERICAL DATA
PALLADIUM 104 TARGET
PARITY
PARTICLE PROPERTIES
PROTONS
QUASI PARTICLES
RADIOISOTOPES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
SAMARIUM 137
SAMARIUM ISOTOPES
SHELL MODELS
SPIN
TARGETS
YRAST STATES