Decay of the High-K Isomeric State to a Rotational Band in 257Rf

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The 257Rf isotope has been populated via the 208Pb(50Ti, n) fusion-evaporation reaction and delayed gamma-ray and electron decay spectroscopy has been performed. The existence of a high-K isomeric state in 257Rf has been confirmed. The isomeric state decays into a rotational band based on the 11/2(-)[725] excitation, which was observed up to spin of (23/2(-)). Three multipolarity-E1 gamma transitions depopulating the isomeric state have been observed, which fixes the spin for that state to (21/2(+)). This assignment agrees with theoretical predictions calculated with the microscopic-macroscopic approach, which suggest the isomeric state to be formed by coupling an unpaired 11/2(-)[725] quasineutron to the (1/2(-)[521] circle times 9/2(+)[624])(5)- two-quasiproton state. The same two-quasiproton excitation is possible for the lowest isomer in 256Rf.


  • J. Rissanen
  • R. M. Clark
  • K. E. Gregorich
  • J. M. Gates
  • C. M. Campbell
  • H. L. Crawford
  • M. Cromaz
  • N. E. Esker
  • P. Fallon
  • O. Gothe
  • I. -Y. Lee
  • H. L. Liu
  • A. O. Machiavelli
  • P. Mudder
  • H. Nitsche
  • G. Pang
  • A. Rice
  • M. A. Stoyer
  • A. Wiens
  • F. R. Xu
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics
Original languageEnglish
Article number044313
JournalPhysical Review C (Nuclear Physics)
Issue number4
Publication statusPublished - 2013
Publication categoryResearch

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