Cosmogenic radionuclide production modeling with Geant4: Experimental benchmarking and application to nuclear spectroscopy of asteroid (16) Psyche
Abstract
Measurements of gamma-ray emissions from the decay of cosmogenic radionuclides provide an opportunity to characterize the elemental composition of a terrestrial planet or asteroid surface. We report on the development of a Geant4 application which models cosmogenic radionuclide production on metal-rich surfaces. The model was benchmarked using measurements of radionuclides produced during 1 GeV proton irradiation of a target made from the Campo del Cielo iron meteorite. The gamma-ray emitting radionuclides 58Co, 57Co, 56Co, 54Mn, 52Mn, 51Cr, 48V, 46Sc and 22Na were observed following the irradiation. Our model reproduced the measured radionuclide production rates to within a factor of 2.5 or better. All but two of the elements (54Mn, 46Sc) have a perfect model-to-data match within their measurement uncertainties. The benchmarked model was used to predict cosmogenic radionuclide production on a large (~100-km radius) metal-rich asteroid. The results are relevant for planned gamma-ray measurements of the metallic asteroid (16) Psyche, which will be visited by the Psyche spacecraft in 2026. We found that galactic-proton-induced radionuclide decay is unlikely to be observed by the Psyche Gamma-Ray Spectrometer (GRS), however an intense solar proton event (>2×106 protons cm-2 over <5 days) will produce measurable quantities of radioisotopes. Measurements of these radioisotopes couldmore »
- Authors:
-
- Johns Hopkins Applied Physics Lab., Laurel, MD (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- California Institute of Technology (CalTech), Pasadena, CA (United States). Jet Propulsion Lab. (JPL)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1631525
- Report Number(s):
- LLNL-JRNL-809380
Journal ID: ISSN 0168-583X; 1015484; TRN: US2200977
- Grant/Contract Number:
- AC52-07NA27344
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
- Additional Journal Information:
- Journal Volume: 446; Journal Issue: C; Journal ID: ISSN 0168-583X
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS
Citation Formats
Peplowski, Patrick N., Wilson, Jack T., Burks, Morgan, Beck, Andrew W., Jun, Insoo, Lawrence, David J., and Yokley, Zachary W. Cosmogenic radionuclide production modeling with Geant4: Experimental benchmarking and application to nuclear spectroscopy of asteroid (16) Psyche. United States: N. p., 2019.
Web. doi:10.1016/j.nimb.2019.03.023.
Peplowski, Patrick N., Wilson, Jack T., Burks, Morgan, Beck, Andrew W., Jun, Insoo, Lawrence, David J., & Yokley, Zachary W. Cosmogenic radionuclide production modeling with Geant4: Experimental benchmarking and application to nuclear spectroscopy of asteroid (16) Psyche. United States. https://doi.org/10.1016/j.nimb.2019.03.023
Peplowski, Patrick N., Wilson, Jack T., Burks, Morgan, Beck, Andrew W., Jun, Insoo, Lawrence, David J., and Yokley, Zachary W. Mon .
"Cosmogenic radionuclide production modeling with Geant4: Experimental benchmarking and application to nuclear spectroscopy of asteroid (16) Psyche". United States. https://doi.org/10.1016/j.nimb.2019.03.023. https://www.osti.gov/servlets/purl/1631525.
@article{osti_1631525,
title = {Cosmogenic radionuclide production modeling with Geant4: Experimental benchmarking and application to nuclear spectroscopy of asteroid (16) Psyche},
author = {Peplowski, Patrick N. and Wilson, Jack T. and Burks, Morgan and Beck, Andrew W. and Jun, Insoo and Lawrence, David J. and Yokley, Zachary W.},
abstractNote = {Measurements of gamma-ray emissions from the decay of cosmogenic radionuclides provide an opportunity to characterize the elemental composition of a terrestrial planet or asteroid surface. We report on the development of a Geant4 application which models cosmogenic radionuclide production on metal-rich surfaces. The model was benchmarked using measurements of radionuclides produced during 1 GeV proton irradiation of a target made from the Campo del Cielo iron meteorite. The gamma-ray emitting radionuclides 58Co, 57Co, 56Co, 54Mn, 52Mn, 51Cr, 48V, 46Sc and 22Na were observed following the irradiation. Our model reproduced the measured radionuclide production rates to within a factor of 2.5 or better. All but two of the elements (54Mn, 46Sc) have a perfect model-to-data match within their measurement uncertainties. The benchmarked model was used to predict cosmogenic radionuclide production on a large (~100-km radius) metal-rich asteroid. The results are relevant for planned gamma-ray measurements of the metallic asteroid (16) Psyche, which will be visited by the Psyche spacecraft in 2026. We found that galactic-proton-induced radionuclide decay is unlikely to be observed by the Psyche Gamma-Ray Spectrometer (GRS), however an intense solar proton event (>2×106 protons cm-2 over <5 days) will produce measurable quantities of radioisotopes. Measurements of these radioisotopes could provide an independent method of determining the Ni-to-Fe ratio of materials at Psyche’s surface. Such an analysis will require the use of radionuclide production cross sections to convert GRS-measured cosmogenic radionuclide decay rates to elemental composition information with the ~10% precision required for planetary geochemical studies.},
doi = {10.1016/j.nimb.2019.03.023},
journal = {Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms},
number = C,
volume = 446,
place = {United States},
year = {Mon Apr 01 00:00:00 EDT 2019},
month = {Mon Apr 01 00:00:00 EDT 2019}
}
Web of Science
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