Physics
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.7827r&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A5, p. 7827-7835.
Physics
4
Argon Isotopes, Galactic Cosmic Rays, Helium Isotopes, Lunar Rocks, Neon Isotopes, Solar Cosmic Rays, Solar Flares, Solar Protons, Atom Concentration, Erosion, Etching, Vertical Distribution, Moon, Samples, Lunar, Apollo 16 Mission, 61016, Solar Flares, Helium, Implantation, Neon, Argon, Gases, Concentration, Depth, Isotopes, Protons, Energy, Shielding, Cosmic Rays, Procedure, Isotopic Ratios, Cosmogenic Material, Production Rate, Comparison, Theoretical Studies
Scientific paper
Depth profiles for Ne-21, Ne-22, and Ar-38 isotopes from oriented lunar rock 61016 are reported. Concentration profiles of cosmogenic GCR+SCR (Galactic cosmic ray and solar cosmic ray-produced) isotopes are determined, quantitatively resolving neon and argon produced by energetic solar flares from that produced by Galactic cosmic rays. The SCR component is resolved from the GCR component as a function of shielding, and excellent agreement is found between experimental SCR production profiles for the isotopes and theoretically calculated values. A characteristic SW He-4/He-3 ratio of 3450 +/- 81, representing energies down to as few keV/amu. In slightly deeper samples an SRF He-4/He-3 ratio of 3450 +/- 725 is found for He particles with E larger than about 1 MeV/amu. These results indicate that the isotopic composition of SF He, averaged over the long term, is energy-dependent. An implanted Ne-20/Ne-22 ratio of 12.4 is measured in unetched samples, representing E greater than 1 MeV/amu, and a ratio of 11.6 is inferred in the samples, representing E larger than about 5 MeV/amu.
Bogard Donald D.
Garrison Daniel H.
Rao Mallikharjuna N.
Reedy Robert C.
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