Computer generation of process explanations in nuclear astrophysics

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In this paper we describe Astra, a computational aid for generating process explanations in nuclear astrophysics. The system operates in two stages, the rst using knowledge of quantum theory to produce a set of legal reactions among elements and the second searching for pathways of such reactions that explain the construction of some element from lighter ones. Astra has found apparently novel reactions that involve proton and neutron capture, as well as novel fusion reactions that produce neutrons and deuterium. The system has also generated reaction pathways for helium, carbon, and oxygen that do not appear in the scienti c literature. However, Astra also nds many other reaction pathways that are less interesting and that suggest priorities for future research. Running head: Generating Explanations in Astrophysics Key words: computational scienti c discovery, model formation, reaction pathways, process explanations Also a liated with the DaimlerChrysler Research and Technology Center...

Sakir Kocabas, Pat Langley

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