Masters Theses
Date of Award
12-2009
Degree Type
Thesis
Degree Name
Master of Science
Major
Physics
Major Professor
Geoffrey L. Greene
Committee Members
Robert Grzywacz, Mike Guidry
Abstract
The NPDGamma collaboration aims to measure a parity{violating directional gamma-ray asymmetry from the capture of polarized cold neutrons on protons. The asymmetry, predicted to be on the order of 50 ppb, is a result of the weak interaction between mesons and nucleons during the neutron capture reaction. The experiment is designed to make a statistics limited measurement of the asymmetry at the level of about 20%. The experiment will be carried out at the Fundamental neutron Physics Beamline (FnPB) at the Spallation Neutron Source (SNS). The neutron beam is polarized by a super{mirror polarizer. A 9.5 G magnetic field guides the neutron spin to a liquid para-hydrogen target, where the neutrons capture forming a deuteron and a 2.2 MeV gamma-ray. The gamma{rays will be detected by a cylin- drical array of CsI scintillating crystals. The beam polarization is reversed with the aid of a resonant RF Spin Rotator (RFSR). This thesis considers different methods for determining the beam polarization and efficiency of the RFSR.
Recommended Citation
Dadras, Mostafa Jon, "Polarimetry Studies for the NPDGamma Experiment at the SNS. " Master's Thesis, University of Tennessee, 2009.
https://trace.tennessee.edu/utk_gradthes/521