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$$beta$$ decay of $$^{75}$$Ni and the systematics of the low-lying level structure of neutron-rich odd-$$A$$ Cu isotopes

Bello Garrote, F. L.*; Sahin, E.*; Tsunoda, Yusuke*; Otsuka, Takaharu*; G$"o$rgen, A.*; Orlandi, R. ; 61 of others*

Detailed spectroscopy of neutron-rich odd-$$A$$ Cu isotopes is of great importance for studying the shell evolution in the region of $$^{78}$$Ni. Excited states in $$^{75}$$Cu were populated in the $$beta$$ decay of $$^{75}$$Ni isotopes, which were produced by the in-flight fission at RIBF, RIKEN. The $$^{75}$$Ni isotopes were separated, identified, and implanted in a highly segmented Si detector array for the detection of the $$beta$$-decay electrons, while the delayed $$gamma$$ rays were detected by an array of HPGe cluster detectors. A level scheme of $$^{75}$$Cu was built up to $$sim$$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-$$A$$ Cu isotopes, revealing the evolution of single-particle states in this region.

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Category:Physics, Nuclear

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