%0 Journal Article
%T Incorporation of 36Cl into Calcium-Aluminum-Rich Inclusions in the Solar Wind Implantation Model
%A Glynn E. Bricker
%A Marc W. Caffee
%J Advances in Astronomy
%D 2013
%I Hindawi Publishing Corporation
%R 10.1155/2013/487606
%X 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 ¡Á 10£¿5 to 5 ¡Á 10£¿5 and the concentration of 36Cl to range from about 3 ¡Á 1013 to 1.5 ¡Á 1014 atoms g£¿1. 1. Introduction Studies report evidence for the incorporation of the short-lived radionuclide (SLR) (T1/2 = 0.3£¿Myr) 36Cl into early solar system materials, including calcium-aluminum-rich inclusions (CAIs). Lin et al. [1] infer an initial 36Cl/35Cl ratio of ¡Ý in sodalite from the carbonaceous chondrite Ningqiang based on Al-Mg systematics. Also, relying upon Al-Mg systematics, Jacobsen et al. [2] report that initial ratio of 36Cl/35Cl in wadalite from Allende would have been > had the initial 26Al/27Al ratio been the canonical value of ~ . Clues to the source of the 36Cl can be gleaned from this initial ratio. If the initial 36Cl/35Cl had been ~ , the source of 36Cl most likely would not have been from a nearby super nova or AGB star [3]. A remaining mechanism for the production of this radionuclide is local irradiation from solar energeticparticle (SEP) born in the protosolar atmosphere. The initial SLR ratios can be used to constrain early solar system evolution and conditions. This is especially true in terms of solar luminosity and flaring characterization. Bricker and Caffee [4] proposed a solar wind implantation model for incorporation of 10Be in CAI precursor materials. In this model, 10Be and possibly other SLRs are produced by SEP reactions in the protosolar atmosphere of a more energetic T-Tauri sun, characterized by SEP fluxes many orders of magnitude greater than contemporary particle fluxes. Studies of
%U http://www.hindawi.com/journals/aa/2013/487606/