The Lunar Neutron Source Function.
Abstract
An estimate of the lunar neutron source function below 15 Mev was obtained by combining the available pertinent experimental measurements with theoretical calculations. A source function with adjustable parameters was first assumed for neutrons below 15 Mev. The resulting neutron fluxes were determined by means of a transport calculation. A thermalization calculation was carried out to determine the thermal neutron spectrum. Production rates are calculated by combining the neutron fluxes with pertinent neutron capture cross sections. The source function parameters are then adjusted to give agreement with the shapes and intensities of the relevant neutron experimental data. Neutron fluxes were calculated by a discreteordinate method for Apollo 11 and Apollo 16 soils using appropriately small energy intervals below 15 Mev. A comparison with previous neutron calculations was made and significant differences discussed. One conclusion is the moon is losing mass.
 Publication:

Ph.D. Thesis
 Pub Date:
 1974
 Bibcode:
 1974PhDT.........7K
 Keywords:

 Physics: Astronomy and Astrophysics;
 Flux (Rate);
 Lunar Surface;
 Neutron Sources;
 Apollo 11 Flight;
 Apollo 16 Flight;
 Neutron Spectra;
 Lunar and Planetary Exploration