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Collinear laser spectroscopy (CLS) is a high-precision technique to study the hyperfine structure (HFS) of atoms and ions [1]. The hyperfine constants are observables that contain atomic and nuclear information simultaneously. While the atomic part is independent of the neutron-number in isotopes of the same element, the contribution of the nuclear part is different due to the different nuclear properties of the isotopes in the studied element. This allows to extract in a nuclear-model independent way a consistent set of nuclear moments along an isotopic chain.
The hyperfine spectra of $^{68-74}$Ge (Z = 32) were acquired at the COLLAPS experimental setup located at ISOLDE-CERN. With the use of the frequency mixing technique, we have been able, for the first time at COLLAPS, to produce 269nm continuous wave (CW) laser light to study the $4s^2 4p^2 \, ^3P_1 - 4s^2 4p 5s \, ^3P_1$ atomic transition. From the hyperfine constants of the $^{69,71,73}$Ge isotopes, measured across the isotopic chain, the nuclear electromagnetic moments are deduced. Those of $^{71,73}$Ge are found to be consistent with the earlier observed values [2,3,4], while the nuclear magnetic and quadrupole moments of $^{69}$Ge are significantly different [5]. In this contribution, the new results are presented and compared to shell model calculations.
[1] R. Neugart et al., J. Phys. G: Nucl. Part. Phys. 44, 064002 (2017)
[2] W.J. Childs and L.S. Goodman, Phys. Rev. 131, 245-250 (1963)
[3] W.J. Childs and L.S. Goodman, Phys. Rev. 141, 15-21 (1966)
[4] W.J. Childs and L.S. Goodman, Phys. Rev. C 1, 750 (1970)
[5] A.F. Oluwole et al., Phys. Rev. C 2, 228-237 (1970)