Neutron-induced nucleosynthesis
نویسندگان
چکیده
منابع مشابه
Nucleosynthesis via Rapid Neutron Capture
I discuss the recent progress in our understanding of nucleosynthesis via rapid neutron capture, the r-process, based on meteoritic data for the early solar system and observations of stars at low metallicities. At present, all data require that there be two distinct kinds of r-process events and suggest that supernovae are associated with these events. The diversity of supernova sources for th...
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Recent AGB models including diffusive overshoot or rotational effects suggest the partial mixing (PM) of protons from the H-rich envelope into the C-rich layers during the third dredge-up. In order to study the impact of such a mixing on the surface abundances, nucleosynthesis calculations based on stellar AGB models are performed for different assumptions of protons (ranging from Xmix p = 10 −...
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Previous compilations of (n, γ ) cross sections of relevance for neutron capture nucleosynthesis in the big bang and in the slow neutron capture process (s process) have been updated to encompass information available up to December 1998; data references include work in process then and published subsequently. The experimental results for nuclei between H and Bi were critically surveyed, renorm...
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Accreting carbon-oxygen white dwarfs approaching the Chandrasekhar mass may provide a substantial fraction of Type Ia supernovae. The hydrodynamics of nuclear burning in these models remains uncertain, but all current models are characterized by an initial period of slow, nearly laminar Ñame propagation at a well-known conductive speed. For cold white dwarfs and slow accretion, the density at t...
متن کاملDirect neutron captures and the r-process nucleosynthesis
The radiative direct capture of neutrons is calculated within the potential model. The uncertainties related to the choice of the neutron-nucleus interaction potential and the prediction of the excitation spectrum in the residual nucleus are discussed. The allowed direct E1-type transitions to all the excited states predicted by a combinatorial model of nuclear level densities are calculated wi...
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ژورنال
عنوان ژورنال: Surveys in Geophysics
سال: 1996
ISSN: 0169-3298,1573-0956
DOI: 10.1007/bf01931785