Published December 2, 1983
| Version v1
Journal article
Samarium-146 in the early solar system: evidence from neodymium in the Allende meteorite
Description
A carbon-chromite fraction from the Allende C3V chondrite shows strikingly large isotopic enrichments of neodymium-142 (0.47%) and neodymium-143 (36%). Both apparently formed by α decay of samarium-146 and samarium-147 (half-lives 1.03 x 108 and 1.06 x 1011 years), but the isotopic enrichment was greatly magnified by recoil of residual nuclei into a carbon film surrounding the samarium-bearing grains. These data provide an improved estimate of the original abundance of extinct samarium-146 in the early solar system [146Sm/144Sm = (4.5 +/- 0.5) x 10-3], higher than predicted by some models of p-process nucleosynthesis. It may be possible to use this isotopic pair as a chronometer of the early solar system
Additional details
Publishing Information
- Journal Title
- Science (Washington, D.C.)
- Journal Volume
- 222
- Series
- Science (Washington, D.C.).
- Journal Page Range
- 1015-1017
- ISSN
- 0036-8075
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 15057738
- Subject category
- S79: ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;
- Descriptors DEI
- ALPHA DECAY; CARBON; CHEMICAL COMPOSITION; CHONDRITES; ISOTOPE RATIO; NEODYMIUM 142; NEODYMIUM 143; NEODYMIUM 145; NEODYMIUM 146; NUCLEOSYNTHESIS; RECOILS; SAMARIUM 146; SAMARIUM 147; SOLAR SYSTEM; STRONTIUM 87
- Descriptors DEC
- ALPHA DECAY RADIOISOTOPES; BETA DECAY RADIOISOTOPES; DECAY; ELECTRON CAPTURE RADIOISOTOPES; ELEMENTS; EVEN-EVEN NUCLEI; EVEN-ODD NUCLEI; HOURS LIVING RADIOISOTOPES; INTERMEDIATE MASS NUCLEI; ISOMERIC TRANSITION ISOTOPES; ISOTOPES; METEORITES; NEODYMIUM ISOTOPES; NONMETALS; NUCLEAR DECAY; NUCLEI; RADIOISOTOPES; RARE EARTH NUCLEI; SAMARIUM ISOTOPES; STABLE ISOTOPES; STONE METEORITES; STRONTIUM ISOTOPES; SYNTHESIS; YEARS LIVING RADIOISOTOPES