Abstract
Low-energy excited states in 71,73Ni populated via the β decay of 71,73Co were investigated in an experiment
performed at the National Superconducting Cyclotron Laboratory (NSCL) at Michigan State University (MSU).
Detailed analysis led to the construction of level schemes of 71,73Ni, which are interpreted using systematics and
analyzed using shell-model calculations. The 5/2− states attributed to the the f5/2 orbital and positive-parity
5/2+ and 7/2+ states from the g9/2 orbital have been identified in both 71,73Ni. In 71Ni the location of a 1/2−
β-decaying isomer is proposed, and limits are suggested as to the location of the isomer in 73Ni. The location of
positive-parity cluster states are also identified in 71,73Ni. Beta-delayed neutron branching ratios obtained from
this data are given for both 71,73Co.
DOI: 10.1103/PhysRevC.85.034326 PACS number(s): 23.40.−s, 21.10.Pc, 21.60.Cs, 27.50.+
