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

J. Rissanen, R. M. Clark, K. E. Gregorich, J. M. Gates, C. M. Campbell, H. L. Crawford, M. Cromaz, N. E. Esker, P. Fallon, Ulrika Forsberg, O. Gothe, I. -Y. Lee, H. L. Liu, A. O. Machiavelli, P. Mudder, H. Nitsche, G. Pang, A. Rice, Dirk Rudolph, M. A. StoyerA. Wiens, F. R. Xu

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

Subject classification (UKÄ)

  • Subatomic Physics


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