Ca-41 in the early solar system

Details Ca-41 in the early solar system Ca-41 in the early solar system

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...431l..67s&link_type=abstract

The Astrophysical Journal, Part 2 - Letters, vol. 431, no. 1, p. L67-L70

Astronomy and Astrophysics

Astrophysics

69

Meteorites, Nuclear Fusion, Nuclear Interactions, Solar Corona, Solar System, Cosmic Rays, Neutrons, Nuclides, Supernovae

Scientific paper

Ca-Al-rich refractory inclusions (CAIs) from the Efremovka carbonaceous chondrite contain excess K-41 that correlates with their Ca-40 contents. Our results suggest the presence of Ca-41 (mean life approximately 0.15 Myr) in the early solar system and an initial Ca-41/Ca-40 ratio of (1.5 +/- 0.3) x 10-8 in the Efremovka CAIs at the time of their formation. The excess K-41 is not due to the production of Ca-41 by secondary neutrons during the cosmic-ray exposure of the Efremovka meteorite. A 'fossil' origin of the excess is not compatible with the magnitude of the observed excess and its correlation with Ca-40. Observation of excess K-41 in CAIs constrains the time interval between the cessation of nucleosynthetic input to the solar nebula and the formation of CAIs to less than a million years.

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