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Commissioning of Ultra-Cold Neutron Asymmetry Spectrometer


Hsiao, Jennifer Ying (2006) Commissioning of Ultra-Cold Neutron Asymmetry Spectrometer. Senior thesis (Major), California Institute of Technology. doi:10.7907/8d5z-bz25.


We can feasibly probe for physics beyond the Standard Model of particle physics with more accurate and precise results from neutron beta decay experiments. An ultracold neutron (UCN) beta decay experiment will begin this year at the Los Alamos Neutron Science Center (LANSCE). This experiment will perform a precision measurement of the neutron betaasymmetry (or the A-correlation), which is the correlation between the neutron's spin and the momentum of the emitted decay electron. A precise measurement of the A-correlation, combined with a value for the neutron lifetime, can be used to test the unitarity of the Standard Model's quark-electroweak mixing matrix. Prior to commencement, the 1 Tesla field superconducting spectrometer constructed for the experiment by Caltech must be fully calibrated. A position and energy resolution study of the plastic scintillator and MWPC was accomplished using thin film conversion line sources, 113Sn and 207Bi, placed at the center of the spectrometer.

Item Type:Thesis (Senior thesis (Major))
Subject Keywords:Physics
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Thesis Availability:Withheld
Research Advisor(s):
  • Filippone, Bradley W.
Thesis Committee:
  • None, None
Defense Date:2006
Record Number:CaltechTHESIS:02132018-112803276
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10706
Deposited By: Joy Painter
Deposited On:13 Feb 2018 23:48
Last Modified:20 May 2020 19:22

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