New Band Structures and an Unpaired Crossing in 78Kr

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High-spin states in Kr-78 were studied using the Ni-58(Na-23,3p) reaction at 70 MeV and the Ni-58(Si-23,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(+) 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. [S0556-2813(99)04602-6].


  • H. Sun
  • J. Doring
  • G. D. Johns
  • R. A. Kaye
  • G. Z. Solomon
  • S. L. Tabor
  • M. Devlin
  • D. R. LaFosse
  • F. Lerma
  • D. G. Sarantites
  • C. Baktash
  • Dirk Rudolph
  • C. H. Yu
  • I. Y. Lee
  • A. O. Macchiavelli
  • I. Birriel
  • J. X. Saladin
  • D. F. Winchell
  • V. Q. Wood
  • I. Ragnarsson
External organisations
  • External Organization - Unknown
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics
Original languageEnglish
Pages (from-to)655-664
JournalPhysical Review C (Nuclear Physics)
Issue number2
Publication statusPublished - 1999
Publication categoryResearch

Bibliographic note