r-Process nucleosynthesis without excess neutrons |
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Authors: | Meyer Bradley S |
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Affiliation: | Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634-0978, USA. mbradle@clemson.edu |
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Abstract: | Matter expanding sufficiently rapidly and at high enough entropy per nucleon can enter a heavy-element synthesis regime heretofore unexplored. In this extreme regime, more similar to nucleosynthesis in the early universe than to that typical in stellar explosive environments, there is a persistent disequilibrium between free nucleons and abundant alpha particles, which allows heavy r-process nucleus production even in matter with more protons than neutrons. This observation bears on the issue of the site of the r process, on the variability of abundance yields from r-process events, and on constraints on neutrino physics derived from nucleosynthesis. |
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