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Title: Monte Carlo calculation of the average neutron depolarization for the NPDGamma experiment

Abstract

The NPDGamma experiment measures the asymmetry in γ-ray emission in the capture of polarized neutrons on liquid parahydrogen. The beam polarization is measured using 3He spin analysis, but this measurement does not account for the contribution of depolarization from spin–flip scattering primarily due to orthohydrogen in the bulk liquid. This is a systematic effect that dilutes the experimental asymmetry and is modeled using Monte Carlo. Finally, methods for tracking neutron spin in MCNPX were developed in order to calculate the average neutron polarization upon capture for use as a multiplicative correction to the measured beam polarization for the NPDGamma experiment.

Authors:
ORCiD logo [1]; ORCiD logo [2]
  1. ; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1607303
Alternate Identifier(s):
OSTI ID: 1543058
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Volume: 942; Journal Issue: C; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; Monte Carlo; MCNPX; NPDGamma experiment

Citation Formats

Grammer, Kyle B., and Bowman, James David. Monte Carlo calculation of the average neutron depolarization for the NPDGamma experiment. United States: N. p., 2019. Web. doi:10.1016/j.nima.2019.162336.
Grammer, Kyle B., & Bowman, James David. Monte Carlo calculation of the average neutron depolarization for the NPDGamma experiment. United States. doi:https://doi.org/10.1016/j.nima.2019.162336
Grammer, Kyle B., and Bowman, James David. Tue . "Monte Carlo calculation of the average neutron depolarization for the NPDGamma experiment". United States. doi:https://doi.org/10.1016/j.nima.2019.162336. https://www.osti.gov/servlets/purl/1607303.
@article{osti_1607303,
title = {Monte Carlo calculation of the average neutron depolarization for the NPDGamma experiment},
author = {Grammer, Kyle B. and Bowman, James David},
abstractNote = {The NPDGamma experiment measures the asymmetry in γ-ray emission in the capture of polarized neutrons on liquid parahydrogen. The beam polarization is measured using 3He spin analysis, but this measurement does not account for the contribution of depolarization from spin–flip scattering primarily due to orthohydrogen in the bulk liquid. This is a systematic effect that dilutes the experimental asymmetry and is modeled using Monte Carlo. Finally, methods for tracking neutron spin in MCNPX were developed in order to calculate the average neutron polarization upon capture for use as a multiplicative correction to the measured beam polarization for the NPDGamma experiment.},
doi = {10.1016/j.nima.2019.162336},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
number = C,
volume = 942,
place = {United States},
year = {2019},
month = {10}
}