eprintid: 25153
rev_number: 15
eprint_status: archive
userid: 3907
dir: disk0/00/02/51/53
datestamp: 2018-08-02 08:45:14
lastmod: 2018-08-23 09:17:24
status_changed: 2018-08-02 08:45:14
type: doctoralThesis
metadata_visibility: show
creators_name: Rischka, Alexander
title: The First Direct Q_EC Measurement in 163Ho
and the Development of the High-Precision
Mass Spectrometer PENTATRAP for Neutrino
Physics
subjects: ddc-530
divisions: i-130001
divisions: i-851340
adv_faculty: af-13
abstract: An improvement of the upper limit of the electron neutrino mass to a sub eV/c2 level is the goal of the ECHo collaboration. The upper limit of the
neutrino mass will be determined with cryogenic microcalorimetry from the analysis of the atomic de-excitation spectrum of 163Dy after the EC in
163Ho. To check for systematic errors an independent measurement of the Q-value of the EC in 163Ho is required. For the first phase of ECHo the issue
with the discrepancy between the latest microcalorimetry measurements of the Q-value and its literature value needed to be fixed. For this, a first direct
measurement of the Q-value of the EC in 163Ho with the Penning-trap mass
spectrometer SHIPTRAP was accomplished in the context of this thesis using
the novel PI-ICR technique. Within the uncertainty, it agrees with the
latest microcalorimetry measurements. Furthermore, the achieved precision
is sufficient for ECHo-1k to be able to improve the upper limit of the electron
neutrino mass to 10 eV/c2 (95% C.L.). For further improvements on the
neutrino mass, the Q-value needs to be improved, too. For this, the novel
high precision Penning-trap mass spectrometer PENTATRAP has been developed
and commissioned. PENTATRAP will utilize five Penning traps to
test new measurement schemes, which could make it possible to reach unv
certainties in the 10^12 regime. Currently, first mass-ratio measurements of
the nuclei pair 132Xe and 131Xe with known masses were carried out to test
the performance of PENTATRAP.
date: 2018
id_scheme: DOI
id_number: 10.11588/heidok.00025153
ppn_swb: 165531341X
own_urn: urn:nbn:de:bsz:16-heidok-251532
date_accepted: 2018-06-27
advisor: HASH(0x55a71840d688)
language: eng
bibsort: RISCHKAALETHEFIRSTDI2018
full_text_status: public
citation:   Rischka, Alexander  (2018) The First Direct Q_EC Measurement in 163Ho and the Development of the High-Precision Mass Spectrometer PENTATRAP for Neutrino Physics.  [Dissertation]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/25153/1/Thesis_Alexander_Rischka.pdf