Type of Work
Article
Date
12-1-2004
Journal Title
Review of Scientific Instruments
Journal ISSN
0034-6748
Journal Volume
75
Journal Issue
12
First Page
5343
Last Page
5355
DOI
10.1063/1.1821628
Abstract
We describe an apparatus used to measure the triple-correlation term (D (σ) over cap (n).p(e)xp(nu)) in the beta decay of polarized neutrons. The D coefficient is sensitive to possible violations of time reversal invariance. The detector has an octagonal symmetry that optimizes electron-proton coincidence rates and reduces systematic effects. A beam of longitudinally polarized cold neutrons passes through the detector chamber, where a small fraction undergo beta decay. The final-state protons are accelerated and focused onto arrays of cooled semiconductor diodes, while the coincident electrons are detected using panels of plastic scintillator. Details regarding the design and performance of the proton detectors, beta detectors, and the electronics used in the data collection system are presented. The neutron beam characteristics, the spin-transport magnetic fields, and polarization measurements are also described. (C) 2004 American Institute of Physics.
Citation Information
Mumm, H. P.; Garcia, A.; Grout, L.; Howe, M.; Parazzoli, L. P.; Robertson, R. G. H.; Sundqvist, K. M.; Wilkerson, J. F.; Freedman, S. J.; Fujikawa, B. K.; Lising, L. J.; Dewey, M. S.; Nico, J. S.; Thompson, A. K.; Chupp, T. E.; Cooper, R. L.; Coulter, K. P.; Hwang, S. R.; Welsh, R. C.; Broussard, L. J.; Trull, C. A.; Wietfeldt, F. E.; and Jones, Gordon L., "emiT: An apparatus to test time reversal invariance in polarized neutron decay" (2004). Hamilton Digital Commons.
https://digitalcommons.hamilton.edu/articles/38
Hamilton Areas of Study
Physics
Notes
This document is the publisher's version of an article published in:
Review of Scientific Instruments, vol. 75, no. 12 (2004): 5343-5345. doi: 10.1063/1.1821628.
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