Physics
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.6353d&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 93, June 10, 1988, p. 6353-6368.
Physics
52
Energetic Particles, Mars Atmosphere, Mars Surface, Neutron Spectra, Hydrogen, Leakage, Monte Carlo Method, Neutron Scattering, Particle Production, Polar Caps, Mars, Neutrons, Spectra, Energy, Monte Carlo Methods, Calculations, Simulations, Parameters, Thermal Properties, Surface, Depth, Hydrogen, Polar Regions, Ice Caps, Thickness, Atmosphere, Pressure, Composition, Water, Distribution, Seasonal Variations
Scientific paper
A high-energy nucleon-meson transport code is used to calculate energy spectra of Martian leakage neutrons. Four calculations are used to simulate a uniform surface layer containing various amounts of water, different burial depths of a 50 percent water layer underneath a 1 percent water layer, changing atmospheric pressure, and a thick carbon dioxide ice sheet overlying a "dirty" water ice sheet. Calculated spectra at energies less than about 1000 eV were fitted by a superposition of thermal and epithermal functions having four free parameters, two of which (thermal and epithermal amplitudes) were found to vary systematically and to specify uniquely the configuration in each of the series. Parameter variations depend on the composition of the assumed surface layers through the average atomic mass and the macroscopic scattering and absorption cross sections. It is concluded that measurements of leakage neutron spectra should allow determination of the hydrogen content of surface layers buried to depths up to about 100 g/sq. cm and determination of the thickness of a polar dry ice cap up to a thickness of about 250 g/sq. cm.
Drake Darrell M.
Feldman William C.
Jakosky Bruce M.
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