Thick-target bombardments with high energy charged particles: Experimental improvements and spatial distribution of low-energy secondary neutrons

Details Thick-target bombardments with high energy charged particles: Experimental improvements and spatial distribution of low-energy secondary neutrons Thick-target bombardments with high energy charged particles: Experimental improvements and spatial distribution of low-energy secondary neutrons

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987nimpa.262..496e&link_type=abstract

Nuclear Instruments and Methods in Physics Research Section A, Volume 262, Issue 2-3, p. 496-502.

Physics

10

Scientific paper

A thick target with dimensions of 100×100×200 cm and a mass of about 16 000 kg was constructed for the simulation of effects of the galactic cosmic radiation (GCR) with matter. After irradiations of this target with 2.1-GeV protons and 800-MeV/nucleon alpha particles, the spatial distribution of low-energy secondary neutrons was determined by neutron-capture reaction products. Due to the large dimensions of the bombarded target and the water-free material used, conditions close to those expected in anhydrous planetary surfaces were successfully simulated, with the exception of the 2π incidence of the GCR. Secondary low-energy neutron fluxes developed broad maxima at depths of 100 to 200 g/cm2 for the proton irradiation and at depths of 70 to 150 g/cm2 for the alpha-particle irradiation, however, demonstrates the role that these particles, which only comprise ~10% of the GCR particle flux, play on the development of the subsurface low-energy neutron fluxes in extraterrestrial objects. Comparisons with similar results from other thick target experiments demonstrate the advantages of the thick target arrangement used.

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