Shape coexistence and signature splitting in [sup 77]Br

Journal Article · Mon Nov 01 04:00:00 EST 1993 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.48.2252· OSTI ID:5832658

Sylvan, G N; Purcell, J E ^[1]; Doering, J; Holcomb, J W; Johns, G D; Johnson, T D; Riley, M A; Womble, P C; Wood, V A; Tabor, S L ^[2]

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1. Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303 (United States)
2. Department of Physics, Florida State University, Tallahassee, Florida 32306 (United States)

High angular momentum states in [sup 77]Br were populated via the [sup 65]Cu([sup 18]O,[alpha]2[ital n])[sup 77]Br reaction at 65 MeV using the Florida State University (FSU) FN Tandem-LINAC accelerator. The Pitt-FSU array with 9 Compton-suppressed high purity Ge detectors was used to measure prompt [gamma]-[gamma] coincidences. Analysis of the coincidences led to an extension of the positive- and negative-parity bands to spins of (41/2[sup +]) and (43/2[sup [minus]]). Directional correlation of oriented nuclei ratios have been deduced where possible, and spin assignments made accordingly. A cranked-shell-model analysis shows that in the positive-parity band the [nu][ital g][sub 9/2] alignment occurs at the same frequency as in the neighboring isotopes, [sup 75,79]Br, but with a larger interaction strength. In the negative-parity bands the lower [pi][ital g][sub 9/2] crossing also occurs at about the same frequency as in [sup 75]Br, but with a smaller interaction. The higher frequency [nu][ital g][sub 9/2] crossing is delayed in [sup 77]Br. Hartree-Fock-Bogolyubov cranking calculations predict considerable [gamma] softness in [sup 77]Br, and particle-rotor model calculations support the interpretation of [gamma] softness or variations in triaxiality within the bands.

• OSTI ID: 5832658
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 48:5; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

663120* -- Nuclear Structure Models & Methods-- (1992-)
663220 -- Electromagnetic Transitions-- (1992-)
663450 -- Heavy-Ion-Induced Reactions & Scattering-- (1992-)
663550 -- Nuclear Mass Ranges-- A=59-89-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA PARTICLES
ANGULAR MOMENTUM
BARYONS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BROMINE 77
BROMINE ISOTOPES
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
COINCIDENCE METHODS
COINCIDENCE SPECTROMETRY
COLLECTIVE EXCITATIONS
COPPER 65 TARGET
COUNTING TECHNIQUES
CRANKING MODEL
DAYS LIVING RADIOISOTOPES
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTARY PARTICLES
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EXCITATION
FERMIONS
GAMMA SPECTROSCOPY
HADRONS
HEAVY ION REACTIONS
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 10-100
MINUTES L
NEUTRONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
OXYGEN 18 REACTIONS
PARITY
PARTICLE PROPERTIES
RADIOISOTOPES
SHELL MODELS
SPECTROSCOPY
SPIN
TARGETS