Evidence of the extinct nuclide146Sm in “Juvinas” achondrite

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Abstract

The search for the isotopic anomaly of Nd due to the disintegration of147Sm and146Sm was carried out on separated mineral phases of Juvinas achondrite. An internal isochron of 4.3 ± 2.5 billion years was obtained for147Smsingle bond143Nd pair. This provides the possibility of dating the planetary materials. Anomalies were observed for142Nd, giving the isotopic ratio146Sm/144Sm at the time of solidification to be 0.39 ± 0.14. This is the first positive evidence of extinct146Sm which may be used as a p-process chronometer.

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