Spallogenic rare gases in iron meteorites with anomalous silver

Details Spallogenic rare gases in iron meteorites with anomalous silver Spallogenic rare gases in iron meteorites with anomalous silver

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981e%26psl..56....9v&link_type=abstract

Earth and Planetary Science Letters, vol. 56, Dec. 1981, p. 9-18. Research supported by the Foundation Blanceflor Boncompagni-L

Computer Science

7

Helium Isotopes, Iron Meteorites, Meteoritic Composition, Silver Isotopes, Spallation, Argon Isotopes, Chemical Composition, Cosmic Rays, Galactic Radiation, Mass Spectrometers, Neon Isotopes, Radiogenic Materials, Meteorites, Spallation, Rare Gases, Iron Meteorites, Silver, Anomalies, Helium, Neon, Argon, Samples, Meteorite, Laboratory Studies, Cosmic Rays, Bombardment, Origin, Formation, Decay, Procedure, Production Rate, Hoba, Calculations, Deep Springs, Pinon, Santa Clara, Tlacotepec, Isotopes, Warburto

Scientific paper

He, Ne, and Ar have been measured in seven iron meteorites for which anomalous Ag isotopic compositions were reported, in order to determine if Ag-107 excesses could be related to galactic cosmic-ray bombardment of these meteorites. The results show that no correlation exists between Ag-107 excess and either the fluence or the energy spectrum of the particles producing spallogenic rare gases. Cosmic-ray-produced Ag-107 estimated from Ar-38 concentrations can account for only about 1 percent of the observed excess. Elimination of cosmic-ray bombardment as a production mechanism for Ag-107 excess strengthens the conclusion that the excess Ag-107 is the decay product of short-lived Pd-107 (half life 6.5 million years). The iron meteorite Pinon is shown to contain trapped rare gases with He-4/Ne-20 approximately 600.

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