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Dissertation/Thesis Abstract

Trapped positrons for high-precision magnetic moment measurements
by Hoogerheide, Shannon Michelle Fogwell, Ph.D., Harvard University, 2013, 181; 3566927
Abstract (Summary)

A single electron in a quantum cyclotron provides the most precise measurement of the electron magnetic moment, given in units of the Bohr magneton by g/2 = 1.001 159 652 180 73 (28) [0.28 ppt]. The most precise determination of the fine structure constant comes from combining this measurement with Standard Model theory, yielding α-1 = 137.035 999 173 (34) [0.25 ppb], limited by the experimental uncertainty of the electron g-value. The most stringent test of CPT symmetry in leptons comes from comparing the electron and positron magnetic moments, limited by the positron uncertainty at 4.2 ppt. A new high-stability apparatus has been built and commissioned for improved measurements of the electron and positron magnetic moments, a greatly improved test of lepton CPT symmetry, and an improved determination of the fine structure constant. These new measurements require robust positron loading from a retractable radioactive source that is small enough to avoid compromising the high-precision environment of our experiment. The design and implementation of such a scheme is a central focus of this work. Robust positron loading at a rate of 1-2 e+/min from a 6.5 μCi 22Na source has been demonstrated.

Indexing (document details)
Advisor: Gabrielse, Gerald
Commitee: Manoharan, Vinothan, Silvera, Isaac
School: Harvard University
Department: Physics
School Location: United States -- Massachusetts
Source: DAI-B 74/10(E), Dissertation Abstracts International
Subjects: Low Temperature Physics, Atomic physics
Keywords: Fine structure constant, G-value, Magnetic moments, Penning traps, Positrons
Publication Number: 3566927
ISBN: 978-1-303-18492-5
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