Gravitational effects on planetary neutron flux spectra

Details Gravitational effects on planetary neutron flux spectra Gravitational effects on planetary neutron flux spectra

Jan 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94..513f&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Jan. 10, 1989, p. 513-525. Research supported by NASA, DARPA, and DOE

Statistics

Computation

22

Flux (Rate), Gravitational Effects, Mars Atmosphere, Mars Surface, Neutron Decay, Neutron Spectra, Radiative Lifetime, Computation, Energy Spectra, Gamma Ray Astronomy, Kinetic Energy, Planetary Surfaces, Regolith, Planets, Gravity Effects, Neutrons, Flux, Spectra, Energy, Surface, Depth, Models, Parameters, Amplitude, Techniques, Numerical Methods, Calculations, Diagrams, Kinetics, Distribution, Analysis, Regolith, Water, Spectroscopy, Doppler Effect, Thermal Properties

Scientific paper

The effects of gravity on the planetary neutron flux spectra for planet Mars, and the lifetime of the neutron, were investigated using a modified one-dimensional diffusion accelerated neutral-particle transport code, coupled with a multigroup cross-section library tailored specifically for Mars. The results showed the presence of a qualitatively new feature in planetary neutron leakage spectra in the form of a component of returning neutrons with kinetic energies less than the gravitational binding energy (0.132 eV for Mars). The net effect is an enhancement in flux at the lowest energies that is largest at and above the outermost layer of planetary matter.

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