Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apj...640..525h&link_type=abstract
The Astrophysical Journal, Volume 640, Issue 1, pp. 525-529.
Astronomy and Astrophysics
Astronomy
25
Solar System: Formation
Scientific paper
Late-formed halogen-rich phases in a refractory inclusion and a chondrule from the Allende meteorite exhibit large 36S excesses that linearly correlate with the chlorine concentration, providing strong evidence in support of the existence of the short-lived nuclide 36Cl (mean life of 0.43 Myr) in the early solar system. The inferred 36Cl/35Cl ratios at the time when these phases formed are very high (~4×10-6) and essentially the same for the inclusion and the chondrule and confirm the earlier report of 36S excess in another meteorite. In addition, the 36Cl is decoupled from 26Al. The observed and any possible higher levels of 36Cl cannot be the result of a supernova or AGB stellar source but require a late episode of energetic particle bombardment by the early Sun, in support of the arguments based on the previous discovery of 10Be. It is now clear that a blend of several sources is required to explain the short-lived nuclei when the solar system formed.
Guan Yunbin
Hsu Weibiao
Leshin Laurie Ann
Ushikubo Takayuki
Wasserburg Gerald J.
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