New band structures and an unpaired crossing in {sup 78}Kr

Journal Article · Mon Feb 01 04:00:00 EST 1999 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.59.655· OSTI ID:304277

Sun, H; Doering, J; Johns, G D; Kaye, R A; Solomon, G Z; Tabor, S L ^[1]; Doering, J ^[2]; Devlin, M; LaFosse, D R; Lerma, F; Sarantites, D G ^[3]; Baktash, C; Rudolph, D; Yu, C ^[4]; Lee, I Y; Macchiavelli, A O ^[5]; Birriel, I; Saladin, J X; Winchell, D F; Wood, V Q ^[6] ; Ragnarsson, I ^[7]

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1. Department of Physics, Florida State University, Tallahassee, Florida 32306 (United States)
2. Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556 (United States)
3. Department of Chemistry, Washington University, St. Louis, Missouri 63130 (United States)
4. Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
5. Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
6. Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260 (United States)
7. Department of Mathematical Physics, Lund Institute of Technology, S-22100 Lund (Sweden)

High-spin states in {sup 78}Kr were studied using the {sup 58}Ni({sup 23}Na,3p) reaction at 70 MeV and the {sup 58}Ni({sup 28}Si,{alpha}4p) reaction at 130 MeV. Prompt {gamma}-{gamma} coincidences were measured using the Pitt-FSU detector array and the GAMMASPHERE-MICROBALL array. Results from these experiments have led to 26 new excitation levels, some of which have been grouped into 3 new bands. Spins were assigned based on directional correlations of oriented nuclei. Two of the new negative-parity bands appear to form a signature-partner pair based on a two-quasineutron structure, in contrast to the previously known two-quasiproton negative-parity bands. A forking has been observed at the 24{sup +} state in the yrast band, which calculations suggest may result from an unpaired crossing. The available evidence suggests oblate shapes in the yrast band coexist with prolate shapes in the negative-parity bands. {copyright} {ital 1999} {ital The American Physical Society}

• OSTI ID: 304277
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 2 Vol. 59; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
GAMMA SPECTRA
HIGH SPIN STATES
KRYPTON 78
NICKEL 58 TARGET
SILICON 28
SODIUM 23
SPIN
YRAST STATES