First spectroscopic study of odd-odd Cu

Pedersen, L. G.*; Sahin, E.*; Grgen, A.*; Bello Garrote, F. L.*; 角田 佑介*; 大塚 孝治*; 新倉 潤*; Orlandi, R.; 他59名*

Physical Review C, 107(4), p.044301_1 - 044301_10, 2023/04

https://doi.org/10.1103/PhysRevC.107.044301

Nuclei in the vicinity of Ni (=28, =50) are important benchmarks to study the evolution of shell structure far from stability. Excited states in Cu were observed for the first time following the -decay of Ni, which was produced by in-flight fission of U. Using -ray coincidences, a level scheme comprising eight excited states was built. Using the observed feeding and the -decay properties of the excited states, spin was tentatively assigned to 5 new states. In addition to the -decaying states, an isomeric state with a lifetime of 3.8(4) ms was found to decay by internal conversion. By comparing the results with large scale shell model calculations, quantitative information about the proton-neutron interaction outside the doubly magic Ni core was obtained.