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Advances in Astronomy
Volume 2013, Article ID 487606, 4 pages
Research Article

Incorporation of 36Cl into Calcium-Aluminum-Rich Inclusions in the Solar Wind Implantation Model

1Department of Physics, Purdue University North Central, Westville, IN 46391, USA
2PRIMELab, Department of Physics, West Lafayette, IN 47907, USA

Received 11 September 2013; Accepted 22 October 2013

Academic Editor: Alberto J. Castro-Tirado

Copyright © 2013 Glynn E. Bricker and Marc W. Caffee. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We consider the short-lived radionuclide (SLR) 36Cl in calcium-aluminum-rich inclusions (CAIs) found in primitive meteorites with the solar wind implantation model. In this model, SLRs are produced via nuclear reaction with solar energetic particles (SEPs) interacting with gaseous targets in the protosolar atmosphere in T-Tauri stars. These SLRs are captured by the solar wind and then implanted in CAI precursor materials, which have dropped from the funnel flow leading onto the protostar. This method of incorporating SLRs into solar system materials is currently active in our solar system and has been measured with SLRs from the solar wind being implanted on the lunar surface. T-Tauri stars are capable of SEP fluxes ~105 greater than contemporary SEP fluxes. Here we scale the production rate of 36Cl to the ancient SEP activity. From the enhanced production rates and the refractory mass inflow rate at 0.06 AU from the protosun, we model the ancient 36Cl content in CAIs. We find the initial isotopic ratio of 36Cl/35Cl to range from about 1 × 10−5 to 5 × 10−5 and the concentration of 36Cl to range from about 3 × 1013 to 1.5 × 1014 atoms g−1.