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Abstract

Laser spectroscopy was performed on the ^72,74,76,78Ga isotopes at On-Line Isotope Mass Separator (ISOLDE) facility, CERN. Ground-state nuclear spins and moments were extracted from the measured hyperfine spectra. The results are compared to shell-model calculations, which provide a detailed probe of the nuclear wave function. The spin is established from the shape of the hyperfine structure and the parity inferred from a comparison of shell-model calculations with the measured nuclear moments. The ground states of ^76,78Ga are both assigned a spin and parity of Iπ=2⁻, while ⁷⁴Ga is tentatively assigned as Iπ=3⁻. For ⁷²Ga, the results are consistent with the previous I=3 assignment.