Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmmr23a1029z&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #MR23A-1029
Physics
0798 Modeling
Scientific paper
Permanently shadowed craters in the polar regions of the Moon can probably contain water ice. It is possible to search for ice deposits by measuring variations of lunar neutron albedo caused by the permanent bombardment of the Moon by Galactic Cosmic Rays. Different types of neutron detectors can be used to measure variations of the neutron albedo. We consider a set of models of neutron detectors with equal mass. All instruments use 3He proportional counters that are designed to detect variations of epithermal neutron flux. A lunar map of hydrogen distribution could be developed by analyzing those variations. If the lunar polar regions contain water ice deposits then hydrogen abundance in lunar soil in those regions increases, and thus such spots can be detected. For the purpose of achieving better spatial resolution some instruments use collimators. Our models which have detailed 3D-geometry are intended for the Monte-Carlo simulation with MCNPX code. Besides, we consider a set of lunar soil models in our simulations. For each of these models we calculate the neutron background flux. A special procedure was developed for simulations of neutron flux detected by different instruments. Different lunar soil models were produced by varying such parameters as density, water abundance, temperature and geometry of possible region containing water ice. As a result for each type of detector we obtained data on variation of counting rate corresponding to variation of lunar soil models. These models will be eventually tested against observations of the future lunar missions.
Milikh Gennady M.
Sagdeev Roal'd. Z.
Sanin Anton B.
Zatsepin O. V.
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