Nuclear moments of germanium isotopes near <i>N</i>=40

Kanellakopoulos, A, Yang, XF, Bissell, ML, Reitsma, ML, Bai, SW, Billowes, J, Blaum, K, Borschevsky, A, Cheal, B ORCID: 0000-0002-1490-6263, Devlin, CS ORCID: 0000-0002-8034-0085
et al (show 17 more authors) (2020) Nuclear moments of germanium isotopes near <i>N</i>=40. PHYSICAL REVIEW C, 102 (5). 054331-.

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Collinear laser spectroscopy measurements were performed on $^{69,71,73}$Ge isotopes ($Z = 32$) at ISOLDE-CERN. The hyperfine structure of the $4s^2 4p^2 \, ^3P_1 \rightarrow 4s^2 4p 5s \, ^3P_1^o$ transition of the germanium atom was probed with laser light of 269 nm, produced by combining the frequency-mixing and frequency-doubling techniques. The hyperfine fields for both atomic levels were calculated using state-of-the-art atomic relativistic Fock-space coupled-cluster calculations. A new $^{73}$Ge quadrupole moment was determined from these calculations and previously measured precision hyperfine parameters, yielding $Q_{\rm s}$ = $-$0.198(4) b, in excellent agreement with the literature value from molecular calculations. The moments of $^{69}$Ge have been revised: $\mu$ = +0.920(5) $\mu_{N}$ and $Q_{\rm s}$= +0.114(8) b, and those of $^{71}$Ge have been confirmed. The experimental moments around $N = 40$ are interpreted with large-scale shell-model calculations using the JUN45 interaction, revealing rather mixed wave function configurations, although their $g$-factors are lying close to the effective single-particle values. Through a comparison with neighboring isotones, the structural change from the single-particle nature of nickel to deformation in germanium is further investigated around $N = 40$.

Item Type: Article
Additional Information: accepted in Phys. Rev. C., in production
Uncontrolled Keywords: nucl-ex, nucl-ex, nucl-th
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 07 Sep 2021 15:27
Last Modified: 14 Mar 2024 19:37
DOI: 10.1103/PhysRevC.102.054331
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