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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]
+ Show Author Affiliations
  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 Laboratory (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.
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Grammer, Kyle B., & Bowman, James David. Monte Carlo calculation of the average neutron depolarization for the NPDGamma experiment. United States. https://doi.org/10.1016/j.nima.2019.162336
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Grammer, Kyle B., and Bowman, James David. Tue . "Monte Carlo calculation of the average neutron depolarization for the NPDGamma experiment". United States. https://doi.org/10.1016/j.nima.2019.162336. https://www.osti.gov/servlets/purl/1607303.
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@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 = {Tue Oct 01 00:00:00 EDT 2019},
month = {Tue Oct 01 00:00:00 EDT 2019}
}
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https://doi.org/10.1016/j.nima.2019.162336
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Works referenced in this record:

Measurement of the absolute neutron beam polarization from a supermirror polarizer and the absolute efficiency of a neutron spin rotator for the NPDGamma experiment using a polarized  3He neutron spin-filter
journal, July 2018

  • Musgrave, M. M.; Baeßler, S.; Balascuta, S.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 895
  • DOI: 10.1016/j.nima.2018.03.055

Neutron scattering of homonuclear diatomic liquids
journal, March 1993

Neutron scattering of homonuclear diatomic liquids
journal, March 1993

Fundamental neutron physics beamline at the spallation neutron source at ORNL
journal, February 2015

  • Fomin, N.; Greene, G. L.; Allen, R. R.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 773
  • DOI: 10.1016/j.nima.2014.10.042

Upper bounds on parity-violating γ-ray asymmetries in compound nuclei from polarized cold neutron capture
journal, December 2006

Measurement of parity-violating γ -ray asymmetry in the capture of polarized cold neutrons on protons
journal, January 2011

Polarization Analysis of Thermal-Neutron Scattering
journal, May 1969

Parity non-conservation in the radiative capture of polarized neutrons by 35Cl
journal, March 1985

A liquid parahydrogen target for the measurement of a parity-violating gamma asymmetry in
journal, August 2010

  • Santra, S.; Barrón Palos, L.; Blessinger, C.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 620, Issue 2-3
  • DOI: 10.1016/j.nima.2010.04.135

Neutron scattering lengths and cross sections
journal, January 1992

Status of the NPDGamma experiment
journal, December 2016

A current mode detector array for -ray asymmetry measurements
journal, March 2005

  • Gericke, M. T.; Blessinger, C.; Bowman, J. D.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 540, Issue 2-3
  • DOI: 10.1016/j.nima.2004.11.043

Slow Neutron Scattering by Molecular Hydrogen and Deuterium
journal, August 1964

A measurement of parity-violating gamma-ray asymmetries in polarized cold neutron capture on , , and
journal, April 2004

  • Mitchell, G. S.; Blessinger, C. S.; Bowman, J. D.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 521, Issue 2-3
  • DOI: 10.1016/j.nima.2003.11.192

Isotopic compositions of the elements 2013 (IUPAC Technical Report)
journal, March 2016

  • Meija, Juris; Coplen, Tyler B.; Berglund, Michael
  • Pure and Applied Chemistry, Vol. 88, Issue 3
  • DOI: 10.1515/pac-2015-0503

Monte Carlo calculation and verification of the geometrical factors for the NPDGamma experiment
journal, September 2018

  • Grammer, K. B.; Blyth, D.; Bowman, J. D.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 903
  • DOI: 10.1016/j.nima.2018.06.081

The implementation of a super mirror polarizer at the SNS fundamental neutron physics beamline
journal, April 2012

  • Balascuta, S.; Alarcon, R.; Baeβler, S.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 671
  • DOI: 10.1016/j.nima.2011.12.088

Determination of the parahydrogen fraction in a liquid hydrogen target using energy-dependent slow neutron transmission
journal, December 2011

  • Barrón-Palos, L.; Alarcon, R.; Balascuta, S.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 659, Issue 1
  • DOI: 10.1016/j.nima.2011.07.051

ENDF/B-VII.1 Nuclear Data for Science and Technology: Cross Sections, Covariances, Fission Product Yields and Decay Data
journal, December 2011

Parity non-conservation in the radiative capture of polarized neutrons by 35Cl
journal, March 1985

Ion chamber system for neutron flux measurements
journal, March 1994

  • Szymanski, J. J.; Bowman, J. D.; Delheij, P. P. J.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 340, Issue 3
  • DOI: 10.1016/0168-9002(94)90139-2

Theory of neutron scattering from liquid and solid hydrogen
journal, March 1967

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