Excess36Ar in the Efremovka Meteorite: A Strong Hint for the Presence of 36Cl in the Early Solar System

Details Excess36Ar in the Efremovka Meteorite: A Strong Hint for the Presence of 36Cl in the Early Solar System Excess36Ar in the Efremovka Meteorite: A Strong Hint for the Presence of 36Cl in the Early Solar System

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...475l..65m&link_type=abstract

Astrophysical Journal Letters v.475, p.L65

Astronomy and Astrophysics

Astronomy

23

Solar System: Formation, Solar System: General, Nuclear Reactions, Nucleosynthesis, Abundances

Scientific paper

Noble gas studies of fine-grained silicate material of the Efremovka carbonaceous chondrite revealed the presence of excess 36Ar over and above the level expected due to contributions from the trapped and cosmic-ray--produced, both spallogenic and secondary neutron--induced, components. The observed excess in 36Ar can be best explained as due to in situ decay of 36Cl ( tau = 0.43 Ma) in the analyzed samples and provides a strong hint for the presence of this now-extinct nuclide in the early solar system. Additional experiments that will confirm our observation are proposed. A conservative estimate of an initial 36Cl/35Cl of (1.4 +/- 0.2) x 10-6 at the time of formation of Efremovka silicates can be made from our data. If we consider a nucleosynthetic origin of 36Cl, the time interval between the last addition of freshly synthesized 36Cl to the solar nebula and the formation of some of the first silicate grains in the nebula could be estimated to be approximately 1 Ma.

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