Nuclear moments of germanium isotopes near N =40
Abstract
Collinear laser spectroscopy measurements were performed on 69,71,73Ge isotopes (Z =32 ) at ISOLDE-CERN. The hyperfine structure of the 4 s24 p2P31→4 s24 p 5 s 1 o 3P 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 by using state-of-the-art atomic relativistic Fock-space coupled-cluster method. A new 73Ge quadrupole moment was determined from these calculations and previously measured precision hyperfine parameters, yielding Qs=-0.198 (4 ) b, in excellent agreement with the literature value from molecular calculations. The moments of 69Ge have been revised: μ =+0.920 (5 ) μN and Qs=+0.114 (8 ) b , and those of 71Ge 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 .
- Publication:
-
Physical Review C
- Pub Date:
- November 2020
- DOI:
- 10.1103/PhysRevC.102.054331
- arXiv:
- arXiv:2011.01659
- Bibcode:
- 2020PhRvC.102e4331K
- Keywords:
-
- Nuclear Experiment;
- Nuclear Theory
- E-Print:
- accepted in Phys. Rev. C., in production