Osmium Isotope Evidence for an s -Process Carrier in Primitive Chondrites
- 19 August 2005
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 309 (5738) , 1233-1236
Abstract
Osmium extracted from unequilibrated bulk chondrites has isotope anomalies consistent with an insoluble s -process carrier, termed Os(i) here. Osmium from metamorphosed bulk chondrites does not have isotope anomalies, implying that the Os(i) carrier was destroyed by metamorphism. The isotopic homogeneity of metamorphosed bulk chondrites is consistent with extremely effective mixing of presolar grains from varied sources in the nebula. Osmium in the Os(i) carrier is likely from nucleosynthetic sites with a neutron density about two to four times as high as that of the average solar s -process Os.Keywords
This publication has 19 references indexed in Scilit:
- Efficient mixing of the solar nebula from uniform Mo isotopic composition of meteoritesNature, 2003
- Presolar stardust in meteorites: recent advances and scientific frontiersEarth and Planetary Science Letters, 2003
- Diverse supernova sources of pre-solar material inferred from molybdenum isotopes in meteoritesNature, 2002
- Molybdenum Evidence for Inherited Planetary Scale Isotope Heterogeneity of the Protosolar NebulaThe Astrophysical Journal, 2002
- STELLAR NUCLEOSYNTHESIS AND THE ISOTOPIC COMPOSITION OF PRESOLAR GRAINS FROM PRIMITIVE METEORITESAnnual Review of Earth and Planetary Sciences, 1998
- Neutron Capture of the Bottleneck Isotopes138Ba and208Pb,s‐Process Studies, and ther‐Process Abundance DistributionThe Astrophysical Journal, 1997
- The s-process branchings at W-185 and Re-186The Astrophysical Journal, 1991
- Ubiquitous interstellar diamond and SiC in primitive chondrites: abundances reflect metamorphismNature, 1990
- Beta-decay rates of highly ionized heavy atoms in stellar interiorsAtomic Data and Nuclear Data Tables, 1987
- Barium and neodymium isotopic anomalies in the Allende meteoriteThe Astrophysical Journal, 1978