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Title: Benchmarking Geant4 for simulating galactic cosmic ray interactions within planetary bodies

Abstract

Galactic cosmic rays undergo complex nuclear interactions with nuclei within planetary bodies that have little to no atmosphere. Radiation transport simulations are a key tool used in understanding the neutron and gamma-ray albedo coming from these interactions and tracing these signals back to geochemical composition of the target. In this paper, we study the validity of the code Geant4 for simulating such interactions by comparing simulation results to data from the Apollo 17 Lunar Neutron Probe Experiment. Different assumptions regarding the physics are explored to demonstrate how these impact the Geant4 simulation results. In general, all of the Geant4 results over-predict the data, however, certain physics lists perform better than others. Finally, in addition, we show that results from the radiation transport code MCNP6 are similar to those obtained using Geant4.

Authors:
 [1];  [2];  [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Planetary Science Inst., Tucson, AZ (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); LANL Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1457313
Report Number(s):
LA-UR-18-22146
Journal ID: ISSN 2333-5084; TRN: US1901353
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Earth and Space Science
Additional Journal Information:
Journal Volume: 5; Journal Issue: 7; Journal ID: ISSN 2333-5084
Publisher:
American Geophysical Union (AGU)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Planetary Sciences

Citation Formats

Mesick, K. E., Feldman, W. C., Coupland, D. D. S., and Stonehill, L. C. Benchmarking Geant4 for simulating galactic cosmic ray interactions within planetary bodies. United States: N. p., 2018. Web. doi:10.1029/2018EA000400.
Mesick, K. E., Feldman, W. C., Coupland, D. D. S., & Stonehill, L. C. Benchmarking Geant4 for simulating galactic cosmic ray interactions within planetary bodies. United States. doi:10.1029/2018EA000400.
Mesick, K. E., Feldman, W. C., Coupland, D. D. S., and Stonehill, L. C. Wed . "Benchmarking Geant4 for simulating galactic cosmic ray interactions within planetary bodies". United States. doi:10.1029/2018EA000400. https://www.osti.gov/servlets/purl/1457313.
@article{osti_1457313,
title = {Benchmarking Geant4 for simulating galactic cosmic ray interactions within planetary bodies},
author = {Mesick, K. E. and Feldman, W. C. and Coupland, D. D. S. and Stonehill, L. C.},
abstractNote = {Galactic cosmic rays undergo complex nuclear interactions with nuclei within planetary bodies that have little to no atmosphere. Radiation transport simulations are a key tool used in understanding the neutron and gamma-ray albedo coming from these interactions and tracing these signals back to geochemical composition of the target. In this paper, we study the validity of the code Geant4 for simulating such interactions by comparing simulation results to data from the Apollo 17 Lunar Neutron Probe Experiment. Different assumptions regarding the physics are explored to demonstrate how these impact the Geant4 simulation results. In general, all of the Geant4 results over-predict the data, however, certain physics lists perform better than others. Finally, in addition, we show that results from the radiation transport code MCNP6 are similar to those obtained using Geant4.},
doi = {10.1029/2018EA000400},
journal = {Earth and Space Science},
number = 7,
volume = 5,
place = {United States},
year = {2018},
month = {6}
}

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