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Title: Monte Carlo calculation and verification of the geometrical factors for the NPDGamma experiment

The NPDGamma experiment measures the parity-violating asymmetry in γ-ray emission in the capture of polarized neutrons on liquid parahydrogen. The sensitivity to the asymmetry for each detector in the array is used as a parameter in the extraction of the physics asymmetry from the measured data. The detector array is approximately cylindrically symmetric around the target and a step-wise sinusoidal function has been used for the sensitivity in the previous iteration of the NPDGamma experiment, but deviations from cylindrical symmetry necessitate the use of a Monte Carlo model to determine corrections to the geometrical factors. For the calculations, source code modifications to MCNPX were done in order to calculate the sensitivity of each cesium iodide detector to the physics asymmetry. Finally, we describe the MCNPX model and results from calculations and how the results are validated through measurement of the parity violating asymmetry of γ-rays from neutron capture on chlorine.
Authors:
ORCiD logo [1] ;  [2] ; ORCiD logo [3] ;  [4] ;  [1] ;  [5] ;  [6] ;  [7]
  1. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Arizona State Univ., Tempe, AZ (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Univ. of Tennessee, Knoxville, TN (United States)
  5. Univ. of Tennessee, Knoxville, TN (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  6. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Kentucky, Lexington, KY (United States)
  7. Indiana Univ., Bloomington, IN (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725; FG02-03ER41258, PHY-0457219; PHY-0758018
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: 903; Journal Issue: C; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE; National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; Monte Carlo; MCNPX; NPDGamma experiment
OSTI Identifier:
1462878

Grammer, Kyle B., Blyth, David, Bowman, James David, Fomin, Nadia, Greene, Geoffrey L., Musgrave, Matthew, Tang, Elise, and Tang, Zhaowen. Monte Carlo calculation and verification of the geometrical factors for the NPDGamma experiment. United States: N. p., Web. doi:10.1016/j.nima.2018.06.081.
Grammer, Kyle B., Blyth, David, Bowman, James David, Fomin, Nadia, Greene, Geoffrey L., Musgrave, Matthew, Tang, Elise, & Tang, Zhaowen. Monte Carlo calculation and verification of the geometrical factors for the NPDGamma experiment. United States. doi:10.1016/j.nima.2018.06.081.
Grammer, Kyle B., Blyth, David, Bowman, James David, Fomin, Nadia, Greene, Geoffrey L., Musgrave, Matthew, Tang, Elise, and Tang, Zhaowen. 2018. "Monte Carlo calculation and verification of the geometrical factors for the NPDGamma experiment". United States. doi:10.1016/j.nima.2018.06.081.
@article{osti_1462878,
title = {Monte Carlo calculation and verification of the geometrical factors for the NPDGamma experiment},
author = {Grammer, Kyle B. and Blyth, David and Bowman, James David and Fomin, Nadia and Greene, Geoffrey L. and Musgrave, Matthew and Tang, Elise and Tang, Zhaowen},
abstractNote = {The NPDGamma experiment measures the parity-violating asymmetry in γ-ray emission in the capture of polarized neutrons on liquid parahydrogen. The sensitivity to the asymmetry for each detector in the array is used as a parameter in the extraction of the physics asymmetry from the measured data. The detector array is approximately cylindrically symmetric around the target and a step-wise sinusoidal function has been used for the sensitivity in the previous iteration of the NPDGamma experiment, but deviations from cylindrical symmetry necessitate the use of a Monte Carlo model to determine corrections to the geometrical factors. For the calculations, source code modifications to MCNPX were done in order to calculate the sensitivity of each cesium iodide detector to the physics asymmetry. Finally, we describe the MCNPX model and results from calculations and how the results are validated through measurement of the parity violating asymmetry of γ-rays from neutron capture on chlorine.},
doi = {10.1016/j.nima.2018.06.081},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
number = C,
volume = 903,
place = {United States},
year = {2018},
month = {6}
}