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.

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.

This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing.

Hamilton Areas of Study

Physics