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High energy irradiations simulating cosmic-ray-induced planetary gamma ray production. I - Fe targetTwo thick Fe targets were bombarded by a series of 6 GeV proton irradiations for the purpose of simulating the cosmic ray bombardment of planetary objects in space. Gamma ray energy spectra were obtained with a germanium solid state detector during the bombardment, and 46 of the gamma ray lines were ascribed to the Fe targets. A comparison between observed and predicted values showed good agreement for Fe lines from neutron inelastic scattering and spallation reactions, and less satisfactory agreement for neutron capture reactions, the latter attributed to the difference in composition between the Fe target and the mean lunar abundance used in the modeling. Through an analysis of the irradiation results together with continuum data obtained in lunar orbit, it was found that 100 hours of measurement with a current instrument should generate a spectrum containing approximately 20 lines due to Fe alone, with a 2-sigma sensitivity for detection of about 0.2 percent.
Document ID
19860049989
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Metzger, A. E.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Parker, R. H.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Yellin, J.
(California Institute of Technology Jet Propulsion Laboratory, Pasadena, United States)
Date Acquired
August 12, 2013
Publication Date
March 30, 1986
Publication Information
Publication: Journal of Geophysical Research
Volume: 91
ISSN: 0148-0227
Subject Category
Nuclear And High-Energy Physics
Accession Number
86A34727
Distribution Limits
Public
Copyright
Other

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