High-spin states in sup 179 Os

Journal Article · Sat Oct 31 23:00:00 EST 1992 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.46.1642· OSTI ID:6971925

Burde, J ^[1]; Deleplanque, M A; Diamond, R M; Macchiavelli, A O; Stephens, F S; Beausang, C W ^[2]

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1. Racah Institute of Physics, Hebrew University of Jerusalem (Israel) Nuclear Science Division, Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States)
2. Nuclear Science Division, Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States)

The {sup 154}Sm({sup 30}Si,5{ital n}){sup 179}Os reaction has been used to study rotational bands at high spin by means of extensive gamma-ray coincidence measurements. The new {alpha}={minus}1/2 signature partner of the 1/2{sup {minus}}(521) band has been found up to spin 31/2{sup {minus}} and the previously known {alpha}=+1/2 partner extended up to spin 45/2{sup {minus}}. The {alpha}={minus}1/2 and {alpha}=+1/2 components of the previously known 7/2{sup {minus}}(514) and the 9/2{sup +}(624) bands were extended up to spins 63/2{sup {minus}}, 53/2{sup {minus}} and 63/2{sup +},61/2{sup +}, respectively. The two components of the newly found band 5/2{sup {minus}}(512) have been established up to spins 59/2{sup {minus}} and 65/2{sup {minus}}. In addition, two other new bands were found, one of them with spins up to 61/2{sup +} decays to the 9/2{sup +}(624) band. Configurations have been proposed by comparing the signature splittings and the {ital B}({ital M}1)/{ital B}({ital E}2) ratios with the theoretical predictions. The latter points to rather strong Coriolis interaction between the 5/2{sup {minus}}(512) and 7/2{sup {minus}}(514) bands. The first band crossing observed in nine out of the ten bands is most probably due to the alignment of a pair of {ital i}{sub 13/2} neutrons, on the basis of a comparison of experimental Routhians with the cranking shell model calculations. In the three positive-parity sequences and in the {alpha}=+1/2 signature of the 5/2{sup {minus}}(512) band, second band crossings are also observed that are suggested to be caused by an alignment of two {ital h}{sub 9/2} protons.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6971925
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 46:5; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

663220 -- Electromagnetic Transitions-- (1992-)
663450* -- Heavy-Ion-Induced Reactions & Scattering-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYONS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CHARGED-PARTICLE REACTIONS
CRANKING MODEL
DATA
DATA ANALYSIS
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
EVEN-ODD NUCLEI
EXCITED STATES
EXPERIMENTAL DATA
FERMIONS
GAMMA SPECTRA
HADRONS
HEAVY ION REACTIONS
HIGH SPIN STATES
INELASTIC SCATTERING
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOTOPES
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 100-1000
MINUTES LIVING RADIOISOTOPES
NEUTRONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
NUMERICAL DATA
OSMIUM 179
OSMIUM ISOTOPES
RADIOISOTOPES
SAMARIUM 154 TARGET
SCATTERING
SILICON 30 REACTIONS
SPECTRA
TARGETS
YRAST STATES