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

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

doi:10.1016/j.nima.2018.06.081

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

Journal Article · Sat Sep 01 00:00:00 EDT 2018 · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

DOI:https://doi.org/10.1016/j.nima.2018.06.081· OSTI ID:1488548

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

The NPDGamma experiment measures the parity-violating asymmetry in gamma-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 gamma-rays from neutron capture on chlorine.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Science Foundation (NSF); Natural Sciences and Engineering Research Council of Canada (NSERC); USDOE Office of Science - Office of Nuclear Physics

DOE Contract Number:: AC02-06CH11357

OSTI ID:: 1488548

Journal Information:: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 903, Issue C; ISSN 0168-9002

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

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