Alpha-decay spectroscopy of 257Rf
Abstract
The decay properties of the ground state and excited states of 257Rf have been investigated with the detector array GABRIELA at the FLNR, Dubna. The electromagnetic decay of a new excited state in 253No has been observed. The state lies 750 keV above the ground state and is favourably populated in the alpha decay of the low-lying spin isomer of 257Rf. It decays to the 9/2- ground state by an M1 transition and is assigned the 11/2-[725] Nilsson configuration. The presence of this state suggests a possible reinterpretation of the decay of the high-K isomer in 253No.
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