High energy irradiations simulating cosmic-ray-induced planetary gamma ray production: I. Fe target

Details High energy irradiations simulating cosmic-ray-induced planetary gamma ray production: I. Fe target High energy irradiations simulating cosmic-ray-induced planetary gamma ray production: I. Fe target

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91d.495m&link_type=abstract

Journal of Geophysical Research, Volume 91, Issue B4, p. D495-D504

Physics

Scientific paper

A series of 6 GeV proton irradiations at the Argonne National Laboratory's Zero Gradient Synchrocyclotron included the bombardment of two thick Fe targets for the purpose of simulating the cosmic ray bombardment of planetary objects in space. Cosmic ray bombardment leads to characteristic gamma ray production, from which, by measuring their energy and intensity, surface composition may be derived. In this experiment, gamma ray energy spectra were obtained with a germanium solid state detector during the bombardment. The spectra show much detail, with 46 of the gamma ray lines ascribed to the Fe targets. The background includes recoil-broadened lines due to energetic neutron interactions in the Ge detector. A comparison with values predicted by modeling shows good agreement for Fe lines from neutron inelastic scattering and spallation reactions, and less satisfactory agreement for neutron capture reactions, the latter found to be due primarily to the difference in composition between the Fe target and the mean lunar abundance used in the modeling. Analysis of the irradiation results combined with continuum data obtained in lunar orbit indicates that 100 hours of measurement with a state-of-the-art instrument should generate a spectrum containing approximately 20 lines due to Fe alone, with a 2σ sensitivity for detection of about 0.2%.

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