Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...224.1007c&link_type=abstract
Astrophysical Journal, Part 1, vol. 224, Sept. 15, 1978, p. 1007-1012.
Astronomy and Astrophysics
Astrophysics
18
Abundance, Barium Isotopes, Meteoritic Composition, Neodymium Isotopes, Nuclear Fusion, Solar System, Anomalies, Carbonaceous Chondrites, Radioactive Isotopes, Stellar Evolution, Supernovae, Barium, Isotopes, Meteorites, Neutrons, Nucleus, Neodymium, Isotopic Composition, Allende Meteorite, Anomalies, Radioactivity, Abundance, Chemical Composition
Scientific paper
My analysis of new discoveries by McCulloch and Wasserburg of Ba and Nd isotopic anomalies in inclusions of the Allende meteorite argues that (1) these anomalies contain special extinct radioactivities resulting from radioactive decay within grains formed in and ejected from the supernova interior, (2) the inclusions studied are fused assemblies of interstellar grains that were never totally vaporized, and (3) theoretical separation into r and s abundances suggests that fluctuations between r and s components has occurred during the accumulation processes. These points lend support to a new chemical picture of the early solar system that I have developed, although many interpretations remain possible. Measurements of the neutron-capture cross sections of Nd isotopes are urgently needed to experimentally validate these conclusions.
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