eprintid: 18106
rev_number: 12
eprint_status: archive
userid: 1640
dir: disk0/00/01/81/06
datestamp: 2015-01-30 10:52:56
lastmod: 2015-02-03 13:16:34
status_changed: 2015-01-30 10:52:56
type: doctoralThesis
metadata_visibility: show
creators_name: Böhm, Christine
title: High-precision mass measurements of neutron-deficient Tl isotopes at ISOLTRAP and the development of an ultra-stable voltage source for the PENTATRAP experiment
subjects: ddc-530
divisions: i-851340
adv_faculty: af-13
keywords: Penningfalle, Kernstruktur, Präzisionsspannungsquelle
abstract: Atomic masses and hence binding energies of nuclides are of great importance for studies of nuclear structure since they reflect all effective interactions in a nucleus.
Within this thesis the masses of seven nuclides, namely 194Au, 194Hg, 190,193,198Tl and 202,208Pb, were determined at the Penning-trap mass spectrometer ISOLTRAP at ISOLDE/CERN.
The thallium region in the chart of isotopes is of special interest due to the occurrence of nuclear structure effects like low-lying isomers, level inversion, shape coexistence
and deformations. These effects are investigated by applying finite-difference mass formulas, such as the two-neutron separation energies or the so-called empirical
pairing gaps. The second topic addressed within the present thesis is an ultra-stable voltage source, called StaReP (Stable Reference for Penning Trap Experiments),
which was developed at the Max-Planck-Institut für Kernphysik. It is one of the
key components of the high-precision mass spectrometer PENTATRAP, containing a tower of five Penning traps. A 25-channel voltage source with a relative stability
of few 10^−8 over a period of 10 minutes in the range of 0 to −100V is mandatory for PENTATRAP aiming for mass measurements with relative mass uncertainties
of ≤ 10^−11. Mass values with such a high precision allow for stringent tests of quantum electrodynamics in strong electric fields, testing Einstein’s mass-energy relation
E = mc^2 as well as measurements of decay energies (Q-values) with applications in neutrino physics.
date: 2015
id_scheme: DOI
id_number: 10.11588/heidok.00018106
ppn_swb: 1654738395
own_urn: urn:nbn:de:bsz:16-heidok-181065
date_accepted: 2015-01-14
advisor: HASH(0x5644fa382908)
language: eng
bibsort: BOHMCHRISTHIGHPRECIS2015
full_text_status: public
citation:   Böhm, Christine  (2015) High-precision mass measurements of neutron-deficient Tl isotopes at ISOLTRAP and the development of an ultra-stable voltage source for the PENTATRAP experiment.  [Dissertation]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/18106/1/Boehm_Diss_pdf_A.pdf