Deformation and signature splitting in sup 74 Br

Journal Article · Fri Feb 01 04:00:00 EST 1991 · Physical Review, C (Nuclear Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevC.43.470· OSTI ID:5712808

Holcomb, J W; Johnson, T D; Womble, P C; Cottle, P D; Tabor, S L ^[1]; Durham, F E; Buccino, S G ^[2]

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1. Department of Physics, Florida State University, Tallahassee, Florida 32306 (US)
2. Department of Physics, Tulane University, New Orleans, Louisiana 70118 (USA)

The high-spin states of {sup 74}Br were studied via the {sup 48}Ti({sup 32}S,{alpha}{ital pn}){sup 74}Br and the {sup 58}Ni({sup 19}F,2{ital pn}){sup 74}Br fusion-evaporation reactions at energies of 105 and 62 MeV, respectively, using the Florida State University Tandem LINAC. {gamma}-{gamma} coincidence arrays were produced using four Compton-suppressed Ge detectors. Two independent groups of {gamma} rays were studied--one of positive parity and one of negative parity, both of which appear to be based on an isomeric 4{sup (+)} state. Lifetimes were measured using both the Doppler-shift attenuation and recoil-distance methods. A cranking-model analysis of the bands shows that the kinematic and dynamic moments of inertia for the bands are rather similar and fairly constant for high spins with values of (20--23){h bar}{sup 2}/MeV. A phase reversal occurs in the signature splitting in the yrast band around spin 9 which is related to the quasiparticle alignments. The lifetimes imply an average axial quadrupole deformation of 0.37 in the yrast band and 0.34 in the negative-parity band. These deformations are close to those predicted by Hartree-Fock-Bogolyubov cranking calculations.

• OSTI ID: 5712808
• Journal Information: Physical Review, C (Nuclear Physics); (USA), Journal Name: Physical Review, C (Nuclear Physics); (USA) Vol. 43:2; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA PARTICLES
BARYONS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BROMINE 74
BROMINE ISOTOPES
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
CRANKING MODEL
DATA
DEFORMED NUCLEI
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
EXPERIMENTAL DATA
FERMIONS
FLUORINE 19 REACTIONS
HADRONS
HEAVY ION FUSION REACTIONS
HEAVY ION REACTIONS
HIGH SPIN STATES
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOTOPES
LIFETIME
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 10-100
MEV RANGE 100-1000
MINUTES LIVING RADIOISOTOPES
MOMENT OF INERTIA
NEUTRONS
NICKEL 58 TARGET
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
NUMERICAL DATA
ODD-ODD NUCLEI
PROTONS
RADIOISOTOPES
SULFUR 32 REACTIONS
TARGETS
TITANIUM 48 TARGET