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(-) 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(-) quasineutron to the (1/2(-) circle times 9/2(+))(5)- two-quasiproton state. The same two-quasiproton excitation is possible for the lowest isomer in 256Rf.
|Research areas and keywords||
Subject classification (UKÄ) – MANDATORY
|Journal||Physical Review C (Nuclear Physics)|
|Publication status||Published - 2013|
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