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Precise Measurement of the Photon Directional Asymmetry in the $\vec{n}p\rightarrow d\gamma$ Reaction

abstract: This work presents analysis and results for the NPDGamma experiment, measuring

the spin-correlated photon directional asymmetry in the $\vec{n}p\rightarrow

d\gamma$ radiative capture of polarized, cold neutrons on a parahydrogen

target. The parity-violating (PV) component of this asymmetry

$A_{\gamma,PV}$ is unambiguously related to the $\Delta I = 1$ component of

the hadronic weak interaction due to pion exchange. Measurements in the second

phase of NPDGamma were taken at the Oak Ridge National Laboratory (ORNL)

Spallation Neutron Source (SNS) from late 2012 to early 2014, and then again in

the first half of 2016 for an unprecedented level of statistics in order to

obtain a measurement that is precise with respect to theoretical predictions of

$A_{\gamma,PV}=O(10^{-8})$. Theoretical and experimental background,

description of the experimental apparatus, analysis methods, and results for

the high-statistics measurements are given. / Dissertation/Thesis / Doctoral Dissertation Physics 2017

Identiferoai:union.ndltd.org:asu.edu/item:44063
Date January 2017
ContributorsBlyth, David Cooper (Author), Alarcon, Ricardo O (Advisor), Ritchie, Barry G (Committee member), Comfort, Joseph R (Committee member), Schmidt, Kevin E (Committee member), Arizona State University (Publisher)
Source SetsArizona State University
LanguageEnglish
Detected LanguageEnglish
TypeDoctoral Dissertation
Format137 pages
Rightshttp://rightsstatements.org/vocab/InC/1.0/, All Rights Reserved

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