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

Grammer, Kyle B.; Bowman, James David

doi:10.1016/j.nima.2019.162336

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

Journal Article · Tue Oct 01 00:00:00 EDT 2019 · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

DOI:https://doi.org/10.1016/j.nima.2019.162336· OSTI ID:1607303

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Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1607303

Alternate ID(s):: OSTI ID: 1543058

Journal Information:: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Journal Name: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment Journal Issue: C Vol. 942; ISSN 0168-9002

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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