5–6 Dec 2019
CERN
Europe/Zurich timezone

Laser spectroscopy on germanium isotopes at COLLAPS-CERN

5 Dec 2019, 12:44
1m
61/1-201 - Pas perdus - Not a meeting room - (CERN)

61/1-201 - Pas perdus - Not a meeting room -

CERN

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Speaker

Mr Anastasios Kanellakopoulos (KU Leuven, Leuven, Belgium)

Description

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)

Primary authors

Mr Anastasios Kanellakopoulos (KU Leuven, Leuven, Belgium) Xiaofei Yang (Peking University (CN)) Shiwei Bai (Peking University (CN)) Klaus Blaum (Max-Planck-Gesellschaft (DE)) Jonathan Billowes (university of manchester) Dr Mark Bissell (University of Manchester, Manchester, United Kingdom) Bradley Cheal (University of Liverpool (GB)) Charlie Stuart Devlin (University of Liverpool (GB)) Ronald Fernando Garcia Ruiz (CERN) Hanne Heylen (CERN) Kristian König (TU Darmstadt) Agota Koszorus (KU Leuven (BE)) Simon Lechner (CERN, TU Wien) Stephan Malbrunot (CERN) Rainer Neugart (Max-Planck-Gesellschaft (DE)) Prof. G Neyens (KU Leuven, Leuven, Belgium) Wilfried Nörtershäuser (TU Darmstadt) Tim Ratajczyk (TU Darmstadt) Simon Mark C Sels (CERN) Liss Vazquez Rodriguez (Max-Planck-Gesellschaft (DE)) Liang Xie (University of Manchester (GB)) Zhengyu Xu (University of Tennessee (US)) Deyan Yordanov (Universite de Paris-Sud 11 (FR)) Hanzhou Yu (Peking University)

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