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Design and Commissioning of a Multi-Reflection Time-of-Flight Mass-spectrometer for Barium Tagging with nEXO.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Design and Commissioning of a Multi-Reflection Time-of-Flight Mass-spectrometer for Barium Tagging with nEXO./
Author:	Murray, Kevin.
Description:	1 online resource (164 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 85-05, Section: B.
Contained By:	Dissertations Abstracts International85-05B.
Subject:	Mass spectrometry. -
Online resource:	click for full text (PQDT)
ISBN:	9798380704212

Design and Commissioning of a Multi-Reflection Time-of-Flight Mass-spectrometer for Barium Tagging with nEXO.
Murray, Kevin.

Design and Commissioning of a Multi-Reflection Time-of-Flight Mass-spectrometer for Barium Tagging with nEXO. - 1 online resource (164 pages)

Source: Dissertations Abstracts International, Volume: 85-05, Section: B.

Thesis (Ph.D.)--McGill University (Canada), 2023.

Includes bibliographical references

The mechanism by which neutrino masses arise is still unknown, yet it is clear from neutrino oscillation experiments that they do have mass. The observation of neutrinoless double beta decay (0νβ β), a lepton number violating process that is beyond the current Standard Model, could shed light on the neutrino mass scale and hierarchy. The existence of this decay would show that the neutrino is a Majorana particle i.e. it is its own antiparticle. This could provide a natural explanation for the smallness of the neutrino masses, as well as a measurement of the effective Majorana neutrino mass. The proposed nEXO experiment aims to search for 0νβ β in 136Xe with a time-projection chamber and five-tonnes of enriched liquid Xe. The Ba-tagging project is a potential future upgrade to nEXO, that seeks to provide a positive identification of a candidate 0νβ β event as a true 136Xe β β decay, by extracting and identifying the daughter 136Ba ion. A spatially resolved multi-element laser ablation ion source (LAS) was developed for the Ba-tagging system along with a multi-reflection time-of-flight mass-spectrometer (MRTOF). The LAS uses a motorized mirror mount to precisely position the ablation laser spot on the surface of a multi-element target. Elements within the target can be selectively ablated with a spatial resolution of ∼ 50µm for calibration of the MRTOF. The MRTOF will be used for systematic studies of the Ba-tagging extraction technique, as well as confirmation of the 136Ba ion isotope mass. A mass-resolving power of m/∆m = 5x104 is needed to separate 136Xe from 136Ba, which can be achieved by the MRTOF which is expected to have a mass-resolving power in excess of m/∆m > 1x105.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798380704212Subjects--Topical Terms:

583253
Mass spectrometry.
Index Terms--Genre/Form:

554714
Electronic books.

Design and Commissioning of a Multi-Reflection Time-of-Flight Mass-spectrometer for Barium Tagging with nEXO.
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500 $a Source: Dissertations Abstracts International, Volume: 85-05, Section: B.
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502 $a Thesis (Ph.D.)--McGill University (Canada), 2023.
504 $a Includes bibliographical references
520 $a The mechanism by which neutrino masses arise is still unknown, yet it is clear from neutrino oscillation experiments that they do have mass. The observation of neutrinoless double beta decay (0νβ β), a lepton number violating process that is beyond the current Standard Model, could shed light on the neutrino mass scale and hierarchy. The existence of this decay would show that the neutrino is a Majorana particle i.e. it is its own antiparticle. This could provide a natural explanation for the smallness of the neutrino masses, as well as a measurement of the effective Majorana neutrino mass. The proposed nEXO experiment aims to search for 0νβ β in 136Xe with a time-projection chamber and five-tonnes of enriched liquid Xe. The Ba-tagging project is a potential future upgrade to nEXO, that seeks to provide a positive identification of a candidate 0νβ β event as a true 136Xe β β decay, by extracting and identifying the daughter 136Ba ion. A spatially resolved multi-element laser ablation ion source (LAS) was developed for the Ba-tagging system along with a multi-reflection time-of-flight mass-spectrometer (MRTOF). The LAS uses a motorized mirror mount to precisely position the ablation laser spot on the surface of a multi-element target. Elements within the target can be selectively ablated with a spatial resolution of ∼ 50µm for calibration of the MRTOF. The MRTOF will be used for systematic studies of the Ba-tagging extraction technique, as well as confirmation of the 136Ba ion isotope mass. A mass-resolving power of m/∆m = 5x104 is needed to separate 136Xe from 136Ba, which can be achieved by the MRTOF which is expected to have a mass-resolving power in excess of m/∆m > 1x105.
520 $a Le mecanisme par lequel emergent les masses des neutrinos est encore inconnu, mais il est clair d'apres les experiences d'oscillation des neutrinos qu'ils ont bien une masse. L'observation de la double desintegration beta sans neutrinos (0νβ β), un processus au-dela du modele standard actuel qui violerait la conservation du nombre leptonique, pourrait eclairer l'echelle de masse des neutrinos et leur hierarchie. L'existence de cette desintegration demontrerait que le neutrino est une particule de Majorana, c'est-a-dire qu'il est sa propre antiparticule. Cela pourrait fournir une explication naturelle pour la petitesse des masses des neutrinos, ainsi qu'une mesure de la masse effective des neutrinos de Majorana. L'experience proposee nEXO vise a rechercher le 0νβ β dans du 136Xe avec une chambre a derive et cinq tonnes de xenon enrichi liquide. Le projet designe « Ba-tagging »est une potentielle amelioration future de nEXO qui vise a identifier de facon positive, parmi des evenements candidats, un evenement de 0νβ β dans du 136Xe en extrayant et en identifiant l'ion fils de 136Ba. Une source d'ions a ablation laser resolue spatialement pour elements multiples («LAS»), ainsi qu'un spectrometre de masse a temps de vol avec reflexions multiples («MRTOF»), ont ete developpes pour le systeme de Ba-tagging. Le LAS utilise une monture a miroir motorisee pour positionner precisement le faisceau d'ablation laser sur la surface d'une cible a elements multiples. Les elements de la cible peuvent etre selectivement pulverises avec une resolution spatiale de ∼ 50µm decoulant de la calibration du MRTOF. Le MRTOF sera utilise pour des etudes systematiques de la technique d'extraction de Ba-tagging, ainsi que pour confirmer la masse isotopique de l'ion de 136Ba. En vertu de sa resolution massique prevue de m/∆m > 1x105, le MRTOF peut fournir la resolution de m/∆m = 5x104 necessaire pour separer le 136Ba du 136Xe.
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