Mapping of fragmented ? f 5/2? ? f 7/2 transitions in the Co 73? Ni 73 decay

Excited states in 73, 75 Ni were investigated through the ? decay of 73, 75 Co in an experiment performed at the National Superconducting Cyclotron Laboratory (NSCL) at Michigan State University (MSU). The experimental results extended the level scheme of Ni 73 to 3.2-MeV excitation energy and provided the experimental information on excited states in Ni 75. The ?-delayed neutron branching ratio for Co 73 was obtained. The experimental results are discussed in comparison with shell-model calculations.