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Gravitational effects on planetary neutron flux spectraThe 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.
Document ID
19890039146
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Feldman, W. C.
(Los Alamos National Lab. NM, United States)
Drake, D. M.
(Los Alamos National Lab. NM, United States)
O'Dell, R. D.
(Los Alamos National Lab. NM, United States)
Brinkley, F. W., Jr.
(Los Alamos National Lab. NM, United States)
Anderson, R. C.
(Los Alamos National Laboratory NM, United States)
Date Acquired
August 14, 2013
Publication Date
January 10, 1989
Publication Information
Publication: Journal of Geophysical Research
Volume: 94
ISSN: 0148-0227
Subject Category
Lunar And Planetary Exploration
Accession Number
89A26517
Distribution Limits
Public
Copyright
Other

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