Updated β-decay measurement of neutron-rich ⁷⁴Cu

The beta decay of neutron-rich Cu-74 has been studied at the Holifield Radioactive Ion Beam Facility at Oak Ridge National Laboratory. By using a high-resolution mass separator a purified Cu-74 beam was obtained, thus allowing decay through its isobar chain to stable Ge-74 without any decay chain member dominating. A total of 170 gamma rays were associated with Cu-74 beta decay with 111 placed in the Zn-74 level scheme. Updated beta feeding intensities and estimated log(f t) values are presented, and new J(pi) assignments are proposed using shell model calculations. The progression of simulated total absorption gamma-ray spectroscopy (TAGS) based on proposed levels and beta-feeding values from previous measurements to this evaluation are presented and demonstrate the need for a TAGS measurements for this and similar decays.