Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...212..567d&link_type=abstract
Astrophysical Journal, Part 1, vol. 212, Mar. 1, 1977, p. 567-569, 571, 573-580.
Astronomy and Astrophysics
Astrophysics
13
Abundance, Carbonaceous Chondrites, Meteoritic Composition, Planetary Evolution, Plutonium 244, Solar System, Fission, Inclusions, Interstellar Matter, Nuclear Fusion, Petrography, Rare Gases, Xenon
Scientific paper
This paper presents results of noble-gas, fission-track, and petrographic investigations of inclusions in the Allende meteorite, most notably a single large coarse-grained 'high temperature condensate' type inclusion. Discussion of the data focuses on the problem of whether or not Pu-244 actually was present in the early solar system, rather than being represented principally by fission xenon imported into the solar system in interstellar grains. The fission-xenon content of the large inclusion corresponds to a Pu-244/U-238 ratio of about 0.0161 at time of formation, 4.5 billion yr ago. Approximately 30% of this Pu-244 has produced visible fossil fission tracks in the major mineral phases; these decays must have occurred within the solar system, establishing a firm lower limit to the amount of Pu-244 which was present in the solar system. The actual value is almost certainly substantially greater than this lower limit.
Drozd R. J.
Morgan C. J.
Podosek Frank A.
Poupeau G.
Shirck J. R.
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