Decay of the high-Jt isomeric state to a rotational band in 257Rf.

Authors :: Rissanen, J.
Clark, R. M.
Gregorich, K. E.
Gates, J. M.
Campbell, C. M.
Crawford, H. L.
Cromaz, M.
Esker, N. E.
Fallon, P.
Forsberg, U.
Gothe, O.
Lee, I.-Y.
Liu, H. L.
Machiavelli, A. O.
Mudder, P.
Nitsche, H.
Pang, G.
Rice, A.
Rudolph, D.
Stoyer, M. A.
Source :: Physical Review C: Nuclear Physics. Oct2013, Vol. 88 Issue 4, p1-9. 9p.
Publication Year :: 2013
Abstract: The 257Rf isotope has beéri populated via the 208Pb(50)Ti, n) fusion-evaporation reaction and delayed y-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-El y 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] quasineuiron to the (1/2-[521] ⊗ 9/2+[624])5- two-quasiproton state. The same two-quasiproton excitation is possible for the lowest isomer in 256Rf. [ABSTRACT FROM AUTHOR]