Identical Bands in 77Sr, 78Sr, and 78Rb - Evidence for a very good Spectator Orbital

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Abstract

The highest spin states in a T(z)=1/2 nucleus have been observed in 77Sr: I(pi)=(49/2+) and (29/2-). In addition, states up to I(pi)=(22+) have been seen in 78Sr. The alpha=1/2, g9/2 band and both signature partners of the negative parity band in 77Sr were found to be identical to the yrast band in 78Sr with relative alignments of 1.22(7)HBAR, 0.52(5)HBAR (alpha=1/2), and 0.42(4)HBAR (alpha=-1/2), respectively. In one of the negative parity bands, the identicality persists through the first proton band crossing. The odd spin decay sequence of the 4- band in 78Rb is identical to the ground band of 78Sr [3.02(3)HBAR] at low spin and to the alpha=1/2, g9/2 band in 77Rb [1.11(3)HBAR] at higher spins. These are the only known examples of identical bands in the neutron deficient A=80 region. The analysis indicates that the [301]3/2 Nilsson orbital is a very good spectator orbital.

Details

Authors
  • C. J. Gross
  • C. Baktash
  • D. M. Cullen
  • R. A. Cunningham
  • J. D. Garrett
  • W. Gelletly
  • F. Hannachi
  • A. Harder
  • M. K. Kabadiyski
  • K. P. Lieb
  • C. J. Lister
  • W. Nazarewicz
  • H. A. Roth
  • Dirk Rudolph
  • D. G. Sarantites
  • J. A. Sheikh
  • J. Simpson
  • O. Skeppstedt
  • B. J. Varley
  • D. D. Warner
External organisations
  • External Organization - Unknown
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics
Original languageEnglish
Pages (from-to)R580-R583
JournalPhysical Review C (Nuclear Physics)
Volume49
Issue number2
Publication statusPublished - 1994
Publication categoryResearch
Peer-reviewedYes

Bibliographic note

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