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Progress Towards a Measurement of Time-Reversal Symmetry Violation in Thallium Fluoride.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Progress Towards a Measurement of Time-Reversal Symmetry Violation in Thallium Fluoride./
Author:	Timgren, Oskari.
Description:	1 online resource (473 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 85-01, Section: B.
Contained By:	Dissertations Abstracts International85-01B.
Subject:	Molecular physics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30310293click for full text (PQDT)
ISBN:	9798379778248

Progress Towards a Measurement of Time-Reversal Symmetry Violation in Thallium Fluoride.
Timgren, Oskari.

Progress Towards a Measurement of Time-Reversal Symmetry Violation in Thallium Fluoride. - 1 online resource (473 pages)

Source: Dissertations Abstracts International, Volume: 85-01, Section: B.

Thesis (Ph.D.)--Yale University, 2023.

Includes bibliographical references

The observed matter-antimatter asymmetry of the universe is widely considered to be an indication of the existence of beyond the Standard Model time-reversal symmetry violating physics. This dissertation describes work on a new molecular beam experiment (CeNTREX) to search for T-violating physics in the hyperfine structure of the diatomic molecule thallium fluoride ((205205Tl19F)). 205TlF is primarily sensitive to T-violating physics due to the Schiff moment of the thallium nucleus. Thus, our experimental scheme is to search for a change in the nuclear magnetic resonance frequency of the 205Tl nucleus when the direction of an electric field coupled to the Schiff moment is reversed.CeNTREX will improve on older experiments using 205TlF by utilizing a cryogenic buffer gas beam source to produce a cold and slowly moving beam of 205TlF, advances in microwave technology for state manipulation, and optical transitions for rotational cooling and detection. Together these enhancements are expected to improve the sensitivity to T-violating interactions in 205TlF by approximately three orders of magnitude over the previous best limit, thus setting new bounds on the Schiff moment of 205Tl, and on related quantities such as the electric dipole moment of the proton. This is expected to make CeNTREX competitive with current state of the art experiments searching for flavor-conserving T-violation in the hadronic sector.This thesis presents progress on various modules of the experiment. Experimental results from characterizing the 205TlF cryogenic buffer gas beam source are presented. We also report an improved measurement of the gain in useful molecular population due to a rotational cooling scheme utilizing optical pumping and microwave driven rotational transitions. Rotational state preparation using microwave driven adiabatic passage in a spatially-varying electric field is discussed, and experimental results are presented. The design of an electrostatic lens to guide the trajectories of molecules emerging from the beam source is also presented.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798379778248Subjects--Topical Terms:

3174737
Molecular physics.
Subjects--Index Terms:

Matter-antimatterIndex Terms--Genre/Form:

542853
Electronic books.

Progress Towards a Measurement of Time-Reversal Symmetry Violation in Thallium Fluoride.
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520 $a The observed matter-antimatter asymmetry of the universe is widely considered to be an indication of the existence of beyond the Standard Model time-reversal symmetry violating physics. This dissertation describes work on a new molecular beam experiment (CeNTREX) to search for T-violating physics in the hyperfine structure of the diatomic molecule thallium fluoride ((205205Tl19F)). 205TlF is primarily sensitive to T-violating physics due to the Schiff moment of the thallium nucleus. Thus, our experimental scheme is to search for a change in the nuclear magnetic resonance frequency of the 205Tl nucleus when the direction of an electric field coupled to the Schiff moment is reversed.CeNTREX will improve on older experiments using 205TlF by utilizing a cryogenic buffer gas beam source to produce a cold and slowly moving beam of 205TlF, advances in microwave technology for state manipulation, and optical transitions for rotational cooling and detection. Together these enhancements are expected to improve the sensitivity to T-violating interactions in 205TlF by approximately three orders of magnitude over the previous best limit, thus setting new bounds on the Schiff moment of 205Tl, and on related quantities such as the electric dipole moment of the proton. This is expected to make CeNTREX competitive with current state of the art experiments searching for flavor-conserving T-violation in the hadronic sector.This thesis presents progress on various modules of the experiment. Experimental results from characterizing the 205TlF cryogenic buffer gas beam source are presented. We also report an improved measurement of the gain in useful molecular population due to a rotational cooling scheme utilizing optical pumping and microwave driven rotational transitions. Rotational state preparation using microwave driven adiabatic passage in a spatially-varying electric field is discussed, and experimental results are presented. The design of an electrostatic lens to guide the trajectories of molecules emerging from the beam source is also presented.
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