Neutrino-induced Fission and [ITAL][CLC]r[/CLC][/ITAL]-Process Nucleosynthesis

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Abstract
An r-process scenario with fission but without fission cycling is considered to account for the observed abundance patterns of neutron-capture elements in ultra-metal-poor stars. It is proposed that neutrino reactions play a crucial role in inducing the fission of the progenitor nuclei after the r-process freezes out in Type II supernovae. To facilitate neutrino-induced fission, the proposed r-process scenario is restricted to occur in a low-density environment, such as the neutrino-driven wind from the neutron star. Further studies to develop this scenario are emphasized.
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