eprintid: 27476
rev_number: 14
eprint_status: archive
userid: 4856
dir: disk0/00/02/74/76
datestamp: 2019-12-16 09:35:59
lastmod: 2020-02-07 10:30:14
status_changed: 2019-12-16 09:35:59
type: doctoralThesis
metadata_visibility: show
creators_name: Nickerson, Brenden Scott
title: Towards coherent control of the 229Th isomeric transition in VUV-transparent crystals
subjects: ddc-530
divisions: i-130001
adv_faculty: af-13
cterms_swd: Thorium-229
abstract: The 229mTh isomeric state at approximately 8:28 eV has generated significant interest as a possible candidate for the development of a nuclear clock with cutting edge precision and stability. One of the approaches to build such a clock relies on the excitation of thorium nuclei doped into VUV-transparent crystals. Excitation in the crystal environment has yet to be achieved experimentally. In this dissertation we investigate from the theoretical side, two methods aimed at exciting thorium's isomeric state within the crystal environment. We study first the possibility to carry out nuclear forward scattering style experiments which could provide a unique signature of the nuclear excitation along with quantifying the detuning of the driving laser systems to the transition energy in question. This work includes analysis of the phase difference and time delay between excitation pulses along with the role of magnetic fields and dopant orientations on the level schemes available for driving. As a second method we investigate Electronic Bridge (EB) processes within the crystal environment which have never been addressed so far in the literature. EB exploits the coupling between the nucleus and the electronic shell which is neglected in the direct laser excitation approach. Novel EB schemes in the crystal environment are introduced which aim to increase the isomeric population with the use of broadband excitation sources. Rates of such EB processes are calculated and their advantages with respect to the direct laser excitation are discussed. These findings support the development of a solid-state nuclear clock.
date: 2019
id_scheme: DOI
id_number: 10.11588/heidok.00027476
ppn_swb: 1685741746
own_urn: urn:nbn:de:bsz:16-heidok-274769
date_accepted: 2019-12-10
advisor: HASH(0x55a71853b360)
language: eng
bibsort: NICKERSONBTOWARDSCOH2019
full_text_status: public
place_of_pub: Heidelberg
citation:   Nickerson, Brenden Scott  (2019) Towards coherent control of the 229Th isomeric transition in VUV-transparent crystals.  [Dissertation]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/27476/1/Nickerson-Dissertation-FINAL-25.10.19.pdf