Other
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51..163m&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 51, Jan. 1987, p. 163-172.
Other
16
Cosmic Rays, Iron Meteorites, Meteoritic Composition, Rare Gases, Argon Isotopes, Krypton Isotopes, Neutron Cross Sections, Selenium Isotopes, Xenon Isotopes, Meteorites, Rare Gases, Cape York, Iron Meteorites, Composition, Decay, Neutrons, Capture, Cosmic Rays, Selinium 82, Samples, Meteorite, Origin, Shielding, Nuclides, Exposure Age, Abundance, Isotopic Ratios, Isotopes, Formation, Source, Xenon 129, Iodine 129, Argon 38, Laboratory Studies, Krypton 82, Experiments, Procedure, Halogens, Calculations, Abu
Scientific paper
The paper reports data on neutron capture products of the secondary cosmic ray component, the inferred proton and neutron fluences, and the identification of double beta decay of Se-82 in heavily shielded samples of the Cape York iron meteorite. One purpose of this study is to develop a new chronometer for cosmic ray exposure, based on the nuclides I-129 (16 My half-life) and Xe-129 from low energy cosmic ray reactions on Te. The abundance ratio of these two nuclides permits the determination of an (effective) exposure age of 93 + or - 16 My, which represents the first exposure age datum of Cape York. The very small concentrations of spallogenic Ar-38 = 6.5 x 10 to the -10th cu cm STP/g in the metal and troilite (per g Fe) document the heavily shielded locations of the sample. An excess of Xe-129 in the troilite is shown to be entirely due to the decay of cosmic-ray-produced I-129. On the other hand, an inclusion in the troilite reveals the presence of Xe-129 from extinct I-129 and documents its about 4.5 Gy formation age. Mono-isotopic excess of Kr-82 is identified as due to beta-beta-decay of Se-82 with an inferred half-life of 1.0 x 10 to the 20th y. This represents the first beta-beta-decay product observed in a meteorite.
Marti Kurt
Murty Sripada V. S.
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