High-{ital K} structure in {sup 77}As

Journal Article · Sat Jun 01 04:00:00 EDT 1996 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.53.2674· OSTI ID:284753

Doering, J; Johns, G D; Kaye, R A; Kemper, K W; Sun, H; 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}As have been studied via the {sup 76}Ge({alpha},{ital p}2{ital n}) reaction. Proton-gated excitation functions extracted from measured {gamma}-ray yields at beam energies of 32, 36, and 40 MeV and an additional {gamma}-{gamma} coincidence measurement at 40 MeV have been used to assign new {gamma}-ray decay sequences to {sup 77}As. In particular, a positive-parity sequence up to spin 25/2 and a high-lying {Delta}{ital I}=1 sequence up to 21/2 and of probably negative parity have been found to decay into the known 9/2{sup +} isomer at 475.5 keV. Nuclear-shape calculations show a triaxial shape for the positive-parity states with moderate quadrupole deformation. The high-lying negative-parity sequence is interpreted as a high-{ital K} three-quasiparticle band similar to bands in adjacent nuclei. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 284753
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 6 Vol. 53; ISSN PRVCAN; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ALPHA REACTIONS
ARSENIC 77
COINCIDENCE METHODS
EXCITATION
GAMMA RADIATION
GERMANIUM 76 TARGET
HIGH SPIN STATES
NEUTRONS
PROTONS