Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Volume 631, Issue 1, Pages 80-89Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nima.2010.11.105
Keywords
Cold neutrons; Polarized neutrons; Neutron polarimetry; Liquid helium; Nucleon-nucleon weak interaction; Parity violation
Categories
Funding
- US Department of Energy [DE-FG02-95ER40901, DE-AI02-93ER40784]
- National Institute of Standards and Technology
- Indiana University Center for Spacetime Symmetries
- [NSF PHY-0457219]
- [NSF PHY-0758018]
- Division Of Physics
- Direct For Mathematical & Physical Scien [969490] Funding Source: National Science Foundation
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Measurements of parity-violating neutron spin rotation can provide insight into the poorly understood nucleon-nucleon weak interaction. Because the expected rotation angle per unit length is small (10(-7) rad/m), several properties of the polarized cold neutron beam phase space and the neutron optical elements of the polarimeter must be measured to quantify possible systematic effects. This paper presents (1) an analysis of a class of possible systematic uncertainties in neutron spin rotation measurements associated with the neutron polarimetry, and (2) measurements of the relevant neutron beam properties (intensity distribution, energy spectrum, and the product of the neutron beam polarization and the analyzing power as a function of the beam phase space properties) on the NG-6 cold neutron beam-line at the National Institute of Standards and Technology Center for Neutron Research. We conclude that the phase space nonuniformities of the polarimeter in this beam are small enough that a parity-violating neutron spin rotation measurement in n-He-4 with systematic uncertainties at the 10(-7) rad/m level is possible. (C) 2010 Elsevier B.V. All rights reserved.
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