Investigation of isomeric states in $^{255}$Rf
Résumé
Using the GABRIELA detector array, -ray and internal-conversion-electron decay spectroscopy has been performed on nuclei that were produced via the fusion-evaporation reaction using the SHELS velocity filter. Three isomers were identified in with the aid of Geant4 simulations. The existence of two high- isomeric states in cascade has been confirmed. Possible three-quasiparticle configurations involving the coupling of the unpaired neutron to two-quasiparticle states have been suggested and a likely decay scenario has been proposed on the basis of comparisons to Geant4 simulations. The simulations have also confirmed the existence of the spin isomer at low excitation energy.
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