decay of Ni and the systematics of the low-lying level structure of neutron-rich odd- Cu isotopes

Bello Garrote, F. L.*; Sahin, E.*; Tsunoda, Yusuke*; Otsuka, Takaharu*; Grgen, A.*; Orlandi, R.  ; 61 of others*

Detailed spectroscopy of neutron-rich odd- Cu isotopes is of great importance for studying the shell evolution in the region of Ni. Excited states in Cu were populated in the decay of Ni isotopes, which were produced by the in-flight fission at RIBF, RIKEN. The Ni isotopes were separated, identified, and implanted in a highly segmented Si detector array for the detection of the -decay electrons, while the delayed rays were detected by an array of HPGe cluster detectors. A level scheme of Cu was built up to 4 MeV, from which the location of the two previously known low-lying isomeric states was clarified. The level structure below 2 MeV was interpreted based on the results of the shell-model calculations and the systematics of odd- Cu isotopes, revealing the evolution of single-particle states in this region.