Discovery of s-process barium in the Murchison meteorite

Details Discovery of s-process barium in the Murchison meteorite Discovery of s-process barium in the Murchison meteorite

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...353l..57o&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 353, April 20, 1990, p. L57-L60.

Astronomy and Astrophysics

Astrophysics

66

Barium Isotopes, Interstellar Matter, Meteoritic Composition, Murchison Meteorite, Carbonaceous Chondrites, Cosmic Dust, Heavy Elements, Nuclear Fusion, Solar System, Meteorites, Murchison, Barium, Composition, Enrichment, Isotopes, Samples, Meteorite, Origin, Formation, Residue, Nuclides, Trapping, Nucleosynthesis, Laboratory Studies, Cm2 Chondrites, Stony Meteorites, Chondrites, Isotopic Ratios, Barium 138

Scientific paper

Barium strongly enriched in its s-process-produced isotopes has been detected in a residue of Murchison meteorite. Relative to Ba - 130, 132 of p-process origin the s-component is enriched by almost 50 percent. The inferred isotopic composition of pure excess s-Ba in Murchison is distinct from average solar system s-Ba. The neutron exposure for the production of excess s-Ba in Murchison of tau(0) = 0.17/mb was lower by more than 30 percent. In the residue s-Ba is enriched over s-Xe about 1800-fold. Possibly, the enhancement is governed by the respective ionization energies which suggests implantation of s-process ions into preexisting host phases. Any HL-Ba which possibly accompanies HL-Xe in this residue can only be enhanced by less than 260 times, suggesting that the conditions for trapping HL-nuclides were different from conditions for trapping s-nuclides.

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