Physics
Scientific paper
Aug 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mpse.conf..130m&link_type=abstract
International Conference on Mars Polar Science and Exploration, p. 130
Physics
Albedo, Spacecraft Instruments, Neutron Counters, Neutrons, Planetary Mapping, Mars Surface, Mars Surveyor 2001 Mission, Ice, Water
Scientific paper
The main scientific objectives of Russian High Energy Neutron Detector HEND are to measure the Albedo of high-energy neutrons from the surface of Mars. HEND will work in integration with US Gamma-Ray Spectrometer and Neutron Spectrometer to provide the map of nuclear lines and neutron albedo. BEND has three He-3-based counters of neutrons for energy ranges 0.01 to 1.0 eV, 1.0 to 1000.0 eV, and 1.0 to 1000.0 keV with thin, medium, and thick moderators, receptively. For the highest energy range of 1.0 to 10.0 MeV BEND has one Stilben-based scintillating detector with active anti-coincidence shielding around it. These detectors will provide the data to build the maps for neutrons at different energy ranges. With the increase of hydrogen content in the surface layer, the termalization path of high-energy neutrons is shortened, and the ratio between original high-energy neutrons and thermal neutrons decreases. The mapping measurements of this water-sensitive signature are the important objective of neutrons measurements. The resulting map of hydrogen abundance will be created taking into account the local day-to-night temperature variations, the latitude, and the season variations.
Kozyrev A. S.
Mitrofanov Igor G.
San'ko N. F.
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