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

K. B. Grammer; D. Blyth; J. D. Bowman; N. Fomin; G. L. Greene; M. Musgrave; E. Tang; Z. Tang

doi:10.1016/j.nima.2018.06.081

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

K. B. Grammer, D. Blyth, J. D. Bowman, N. Fomin, G. L. Greene, M. Musgrave, E. Tang, Z. Tang

Neutronics Group

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

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. 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.

Original language	English
Pages (from-to)	302-308
Number of pages	7
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	903
DOIs	https://doi.org/10.1016/j.nima.2018.06.081
State	Published - Sep 21 2018

Funding

This work was supported in part by DOE DE-FG02-03ER41258 , NSF PHY-0457219 , and NSF PHY-0758018 . Z. Tang acknowledges support from the Indiana University Center for Spacetime Symmetries . This work was supported in part by DOEDE-FG02-03ER41258, NSFPHY-0457219, and NSFPHY-0758018. Z. Tang acknowledges support from the Indiana University Center for Spacetime Symmetries.

Funders	Funder number
Indiana University Center for Spacetime Symmetries
National Science Foundation	PHY-0457219, PHY-0758018
U.S. Department of Energy	DE-FG02-03ER41258
Directorate for Mathematical and Physical Sciences	0758018, 0457219
National Science Foundation

Keywords

MCNPX
Monte Carlo
NPDGamma experiment

Access to Document

10.1016/j.nima.2018.06.081

Cite this

Grammer, K. B., Blyth, D., Bowman, J. D., Fomin, N., Greene, G. L., Musgrave, M., Tang, E., & Tang, Z. (2018). Monte Carlo calculation and verification of the geometrical factors for the NPDGamma experiment. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 903, 302-308. https://doi.org/10.1016/j.nima.2018.06.081

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abstract = "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. 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.",

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Grammer, KB, Blyth, D, Bowman, JD, Fomin, N, Greene, GL, Musgrave, M, Tang, E & Tang, Z 2018, 'Monte Carlo calculation and verification of the geometrical factors for the NPDGamma experiment', Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 903, pp. 302-308. https://doi.org/10.1016/j.nima.2018.06.081

Monte Carlo calculation and verification of the geometrical factors for the NPDGamma experiment. / Grammer, K. B.; Blyth, D.; Bowman, J. D. et al.
In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 903, 21.09.2018, p. 302-308.

Research output: Contribution to journal › Article › peer-review

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AU - Grammer, K. B.

AU - Blyth, D.

AU - Bowman, J. D.

AU - Fomin, N.

AU - Greene, G. L.

AU - Musgrave, M.

AU - Tang, E.

AU - Tang, Z.

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ER -

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

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