title: High-precision Penning-trap determination of the electron capture Q-value in 163-Ho for the determination of the electron neutrino mass
creator: Schweiger, Christoph
subject: ddc-530
subject: 530 Physics
description: The ECHo and HOLMES experiments investigate the effective electron neutrino mass following the least model-dependent approach by studying the kinematic of the electron capture in 163-Ho using cryogenic microcalorimeters.  Possible systematic shifts in the calorimetric measurements can originate from the decay of 163-Ho within the solid gold absorber material of the calorimeter.  In order to assess if such a systematic shift is present on the current sensitivity level of those experiments, the Q-value of this decay from microcalorimetry is compared to an independently measured one.  This cumulative thesis is based on the experimental developments towards and the independent measurement of the Q-value of 163-Ho electron capture using Penning-trap mass spectrometry.  In the first part of this thesis, an injection system for an electron beam ion trap capable of operating with rare isotopes, specifically the artificially produced 163-Ho, was developed for the creation of highly charged ions.  For the Penning-trap measurement, a single highly charged ion in the correct charge state is required and has to be selected from the different charge states produced within in the electron beam ion trap.  A Bradbury-Nielsen gate and a very fast high-voltage push-pull switch based on silicon carbide MOSFETs was developed within this thesis to separate the different charge states according to their time-of-flight in the beamline following the electron beam ion trap.  These technical developments allowed a measurement of the Q-value of 163-Ho with the Penning-trap mass spectrometer PENTATRAP as the main result of this thesis.
date: 2024
type: Dissertation
type: info:eu-repo/semantics/doctoralThesis
type: NonPeerReviewed
format: application/pdf
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/34804/1/Thesis_Schweiger.pdf
identifier: DOI:10.11588/heidok.00034804
identifier: urn:nbn:de:bsz:16-heidok-348043
identifier:   Schweiger, Christoph  (2024) High-precision Penning-trap determination of the electron capture Q-value in 163-Ho for the determination of the electron neutrino mass.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/34804/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng