Isotopically normal zirconium in Murchison hibonite 13-13: Implications for a link between the e- and r-processes

Details Isotopically normal zirconium in Murchison hibonite 13-13: Implications for a link between the e- and r-processes Isotopically normal zirconium in Murchison hibonite 13-13: Implications for a link between the e- and r-processes

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...434l..79i&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 434, no. 2, p. L79-L81

Astronomy and Astrophysics

Astrophysics

1

Abundance, Chemical Composition, Isotopic Enrichment, Murchison Meteorite, Zirconium, Anomalies, Ion Probes, Mass Spectroscopy, Nuclear Fusion, Spectral Signatures

Scientific paper

The isotopic composition of zirconium has been measured in Murchison hibonite grain 13-13 by ion microprobe mass spectrometry. Despite the highly anomalous Ti isotopic composition (27% excess of Ti-50), there is no evidence for any significant anomalies in the Zr isotopic abundances. This result is contrary to that expected based on a recent finding of Zr-96 excesses correlated with Ti-50 excesses in Allende refractory inclusions from which a link between the nucleosynthetic e- and r-processes was proposed. While Zr and Ti isotopic anomalies may exist together in Allende inclusions, it must be demonstrated more definitively that the Zr and Ti isotopic anomalies represent a genetic association rather than simply a mix of isotopically anomalous components with different degrees of dilution by normal solar material. If the Zr-96 excess in the Allende inclusions is indeed a signature of the r-process, then the absence of a correlated excess of Ti-50 with Zr-96 in the Murchison hibonite indicates that the e- and r-processes are not always associated.

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