Alignments and shape changes in {sup 77}Se

Journal Article · Sat Feb 01 04:00:00 EST 1997 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.55.660· OSTI ID:450486

Johns, G D; Doering, J; Kaye, R A; Sylvan, G N; Tabor, S L ^[1]

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1. Department of Physics, Florida State University, Tallahassee, Florida 32306 (United States)

High-spin states in {sup 77}Se were studied using the {sup 76}Ge({alpha},3n) reaction at 40 MeV at the Florida State University Tandem-LINAC facility. Prompt {gamma}-{gamma} coincidences were observed using the Pitt-FSU detector array. The positive- and negative-parity yrast bands were extended up to spins of ((31)/(2){sup +}) and ((27)/(2){sup {minus}}), respectively. Spin assignments were made based on directional correlation of oriented nuclei ratios whenever possible. A rich and complicated high-lying high-K negative-parity structure was also found. The positive-parity yrast structure shows a change from large signature splitting at low spin to a more uniform level spacing at higher spins, as has been seen in the heavier N=43 isotones. Theoretically, this change is attributed to a shift from oblate to triaxial shape due to the alignment of a pair of g{sub 9/2} protons. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 450486
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 2 Vol. 55; ISSN PRVCAN; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

44 INSTRUMENTATION
INCLUDING NUCLEAR AND PARTICLE DETECTORS
66 PHYSICS
ALPHA REACTIONS
ANGULAR DISTRIBUTION
CORRELATIONS
ENERGY-LEVEL TRANSITIONS
GAMMA RADIATION
GERMANIUM 76 TARGET
HIGH SPIN STATES
MEV RANGE 10-100
NEUTRONS
PARITY
SELENIUM 77
SHAPE
SPIN
SPIN ORIENTATION
YRAST STATES