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

Journal Article · Mon Jul 06 04:00:00 EDT 1998 · Physical Review C

OSTI ID:771901

Sun, H ^[1]; Doring, J; Johns, R A; Solomon, G; Tabor, S; Devlin, M; LaFosse, D; Lerma, F; Sarantites, D; Baktash, C; Rudolph, D; Yu, C H; Lee, I Y; Macchiavelli, A; Birriel, I; Saladin, J; Winchell, D; Wood, V Q; Ragnarsson, I

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1. LBNL Library

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.

• Research Organization: Lawrence Berkeley National Lab., CA (US)
• Sponsoring Organization: USDOE Director, Office of Science. Office of High Energy and Nuclear Physics (US)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 771901
• Report Number(s): LBNL--46361
• Journal Information: Physical Review C, Journal Name: Physical Review C Journal Issue: 2 Vol. 59
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR CORRELATION
EXCITATION
KRYPTON 78
ORIENTED NUCLEI
PHYSICS