Barium and neodymium isotopic anomalies in the Allende meteorite

Journal Article · Wed Feb 15 04:00:00 EST 1978 · Astrophys. J., Lett.; (United States)

DOI:https://doi.org/10.1086/182628· OSTI ID:5078868

McCulloch, M T; Wasserburg, G J

Isotopic anomalies have been found for Ba and Nd in two inclusions from the Allende meteorite. These inclusions are typical Ca-Al-rich objects associated with early condensates from the solar nebula but have distinctive O and Mg isotopic anomalies of the FUN type. Sample C1 shows a depletion only in /sup 135/Ba of 2 parts in 10/sup 4/ and normal Nd. Sample EK1-4-1 shows large positive excesses in the unshielded isotopes /sup 135/Ba and /sup 137/Ba of 13.4 and 12.3 parts in 10/sup 4/, respectively. The Nd isotopic composition in EK1-4-1 is highly aberrant in at least five isotopes. Both the Ba and Nd anomalies can be explained by a model of r-process addition. These anomalies are found to be uniform between coexisting mineral phases. These observations show the existence of substantial isotopic anomalies in refactory elements in the neighborhood of Xe and extend the range of elements showing isotopic effects to O, Ne, Mg, Ca, Kr, Xe, Ba, and Nd. The observations, in conjunction with the presence of /sup 26/Al (tau/sub 1/2/=7 x 10/sup 5/years), are interpreted as the result of a nearby supernova explosion which produced elements over a wide mass range and injected them into the early solar nebula shortly before condensation.

• Research Organization: The Lunatic Asylum, Division of Geological and Planetary Sciences, Caltech, Pasadena, CA 91125
• OSTI ID: 5078868
• Journal Information: Astrophys. J., Lett.; (United States), Journal Name: Astrophys. J., Lett.; (United States) Vol. 220:1; ISSN AJLEA
• Country of Publication: United States
• Language: English

Related Subjects

640101* -- Astrophysics & Cosmology-- Cosmic Radiation
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
ALKALINE EARTH ISOTOPES
BARIUM ISOTOPES
CHEMICAL COMPOSITION
ISOTOPE RATIO
ISOTOPES
METEORITES
METEOROIDS
NEBULAE
NEODYMIUM ISOTOPES
NUCLEOSYNTHESIS
R PROCESS
SOLAR NEBULA
STAR EVOLUTION
STARS
SUPERNOVAE