eprintid: 31317
rev_number: 39
eprint_status: archive
userid: 6524
dir: disk0/00/03/13/17
datestamp: 2022-03-01 13:00:07
lastmod: 2022-03-04 07:06:42
status_changed: 2022-03-01 13:00:07
type: doctoralThesis
metadata_visibility: show
creators_name: Sailer, Tim
title: Direct Bound-Electron g-Factor Difference Measurement of Coupled Ions at Alphatrap
subjects: ddc-530
divisions: i-130200
adv_faculty: af-13
keywords: Penning trap, g Factor, coupled ions
abstract: The Alphatrap experiment is a cryogenic Penning-trap setup with the main objective to determine the g factor of the electron bound to heavy nuclei. Within this thesis, the results of several such measurements are presented. Among these, the measurement of the g factor of 20Ne9+
exhibits a 3σ discrepancy between theory and experimental value, which has been attributed to the required input parameter of the atomic mass of 20Ne. An independent measurement has recently confirmed the deviation of the mass, fully resolving the discrepancy. Furthermore, a measurement of 22Ne9+ can be used to improve the precision of the atomic mass of 22Ne by a factor 8 compared to the literature value, when using the theoretically predicted g factor as an input. However, the main focus of this thesis is the development of a novel technique, which, based upon the coupling of two ions as an ion crystal, enables the most precise determination of a g-factor difference to date. This difference, determined for the isotopes 20Ne9+ and 22Ne9+ with a relative precision of 5.6 × 10−13 with respect to the g factor, improves the precision for isotopic shifts of g factors by about two orders of magnitude. Based upon the agreement with theory, the quantum electrodynamic contribution to the nuclear
recoil can be confirmed. Alternatively, the result can be applied to improve the precision of the charge radius difference of the isotopes by about one order of magnitude or to constrain new physics by limiting a potential fifth-force of the Higgs-portal mechanism.
date: 2022
id_scheme: DOI
id_number: 10.11588/heidok.00031317
ppn_swb: 1794378499
own_urn: urn:nbn:de:bsz:16-heidok-313170
date_accepted: 2022-02-16
advisor: HASH(0x55fc36d34150)
language: eng
bibsort: SAILERTIMDIRECTBOUN2022
full_text_status: public
place_of_pub: Heidelberg
citation:   Sailer, Tim  (2022) Direct Bound-Electron g-Factor Difference Measurement of Coupled Ions at Alphatrap.  [Dissertation]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/31317/1/Thesis_Sailer.pdf