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Phys. Rev. C 59, 655–664 (1999)

New band structures and an unpaired crossing in 78Kr

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H. Sun1,*, J. Döring1,2, G. D. Johns1,†, R. A. Kaye1,‡, G. Z. Solomon1, S. L. Tabor1, M. Devlin3, D. R. LaFosse3, F. Lerma3, D. G. Sarantites3, C. Baktash4, D. Rudolph4,§, C.-H. Yu4, I. Y. Lee5, A. O. Macchiavelli5, I. Birriel6, J. X. Saladin6, D. F. Winchell6, V. Q. Wood6, and I. Ragnarsson7
1Department of Physics, Florida State University, Tallahassee, Florida 32306
2Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556
3Department of Chemistry, Washington University, St. Louis, Missouri 63130
4Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
5Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
6Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260
7Department of Mathematical Physics, Lund Institute of Technology, S-22100 Lund, Sweden

Received 6 July 1998; published in the issue dated February 1999

High-spin states in 78Kr were studied using the 58Ni(23Na,3p) reaction at 70 MeV and the 58Ni(28Si,α4p) reaction at 130 MeV. Prompt γ-γ 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+ 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.

© 1999 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.59.655
DOI:
10.1103/PhysRevC.59.655
PACS:
21.10.Re, 21.60.Ev, 23.20.Lv, 27.50.+e

*Permanent address: Department of Physics, Jilin University, Changchun, Jilin 130023, People’s Republic of China.

†Present address: Los Alamos National Laboratory, Los Alamos, NM 87545.

‡Present address: Physics Division, Argonne National Laboratory, Argonne, IL 60439.

§Present address: Department of Physics, Lund University, S-22100 Lund, Sweden.

 
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