The excitation functions of BA /p, X/ Xe-M /M 124-136/ in the energy range 38-600 MeV - The use of 'cosmogenic' xenon for estimating 'burial' depths and 'real' exposure ages

Details The excitation functions of BA /p, X/ Xe-M /M 124-136/ in the energy range 38-600 MeV - The use of 'cosmogenic' xenon for estimating 'burial' depths and 'real' exposure ages The excitation functions of BA /p, X/ Xe-M /M 124-136/ in the energy range 38-600 MeV - The use of 'cosmogenic' xenon for estimating 'burial' depths and 'real' exposure ages

Mar 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977rspta.285..337k&link_type=abstract

(Royal Society, Discussion on the Moon - A New Appraisal from Space Missions and Laboratory Analyses, London, England, June 9-12

Physics

6

Abundance, Barium, Cosmic Rays, Nuclear Fusion, Proton Irradiation, Xenon Isotopes, Bibliographies, Correlation, Galactic Radiation, Lunar Rocks, Mass Spectroscopy, Nuclear Reactions

Scientific paper

Thin-target experiments were performed to obtain the excitation functions of the reactions Ba (p, X) Xe-M. The abundances of all stable Xe isotopes and of the radionuclides Xe-127 and Ba-131 were determined by means of rare-gas mass spectroscopy and gamma-counting, respectively. The excitation functions show marked characteristics leading to strong variations in the proton-induced Xe ratios as functions of energy. The Xe-131/Xe-126 ratio - the special lunar anomaly - was found to vary from about 1.14 (600 MeV) to about 248.8 (75 MeV). The Xe-M production rates and the Xe-M/Xe-126 ratios as functions of depths were estimated for 2 pi geometry utilizing the depth-dependent galactic-cosmic-ray fluxes of Reedy and Arnold (1972). Substantial isotopic variations for all of the proton-induced Xe ratios were found, sufficient to explain most of the cosmogenic Xe ratios (exceptions are Xe-130 and Xe-132) measured yet in lunar samples with proton-induced reactions on Ba at different depths in the moon. Actual lunar samples are used to check the validity of the results.

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