Barium and neodymium isotopic anomalies in the Allende meteorite

Details Barium and neodymium isotopic anomalies in the Allende meteorite Barium and neodymium isotopic anomalies in the Allende meteorite

Feb 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...220l..15m&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 220, Feb. 15, 1978, p. L15-L19.

Astronomy and Astrophysics

Astrophysics

80

Barium Isotopes, Meteoritic Composition, Neodymium Isotopes, Nuclear Fusion, Anomalies, Chemical Properties, Condensing, Mass Spectroscopy, Solar Corona, Supernovae

Scientific paper

The discovery of Ba and Nd isotopic anomalies in two inclusions from the Allende meteorite is reported. The inclusions are Ca-Al-rich objects typical of the type considered as high-temperature condensation products in the solar nebula and contain distinctive Mg and O isotopic anomalies of the FUN (mass Fractionation, Unknown Nuclear processes) type. Mass-spectrometry results are discussed which show that inclusion C1 has anomalies in Ba at masses 134 and 136, while inclusion EK1-4-1 exhibits large marked negative anomalies at 130, 132, 134, and 136, as well as a positive anomaly at 137. It is also found that inclusion EK1-4-1 shows marked negative anomalies in Nd at masses 142, 146, 148, and 150, in addition to a positive anomaly at 145. These isotopic shifts are attributed to addition of r-process nuclei rather than mass fractionation. It is suggested that an onion-shell supernova explosion followed by injection into the solar nebula is the most likely generic model that may explain the observations.

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