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Short-lived nuclei in the early solar system and a diversity of r-processes

Wasserburg, G. J. (1999) Short-lived nuclei in the early solar system and a diversity of r-processes. Abstracts of Papers of the American Chemical Society, 217 . U13-U13. ISSN 0065-7727.

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It is established that Pu-244, Hf-182, I-129, Pd-107, Fe-60, Mn-53, Ca-41, and Al-26 were present in the early solar system. Several stellar sources are responsible for producing these nuclei. Short-lived Al-26 and Ca-41 require a very late stage injection into the proto-solar nebula and rapid accretion of the sun (~7x10^(25)y). I-129 is produced only by the r-process in low abundance, requiring long term contributions to the solar nebula cease ~10^8 y prior to collapse. In contrast, Hf-182, with a larger-process component, is in high abundance, requiring a time scale of ~10^7 y. This discrepancy requires distinctive SN sites for production of the r-process. Furthermore, from neutrino interactions competing with beta decays, the two r-processes cannot be produced in a single scenario. Using the results of Richter, Ott, and Begemann and considering neutrino spallation reactions during post processing, we calculate the dynamic scale for SNII to be tau < 0.85 s.

Item Type:Article
Wasserburg, G. J.0000-0002-7957-8029
Additional Information:© 1999 American Chemical Society.
Record Number:CaltechAUTHORS:20140204-083216771
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43637
Deposited By: Tony Diaz
Deposited On:25 Feb 2014 17:43
Last Modified:09 Mar 2020 13:19

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