Neutron capture rates in the r-process - The role of direct radiative capture

Details Neutron capture rates in the r-process - The role of direct radiative capture Neutron capture rates in the r-process - The role of direct radiative capture

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...270..740m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 270, July 15, 1983, p. 740-745.

Physics

Nuclear Physics

18

Absorption Cross Sections, Neutron Cross Sections, Nuclear Fusion, Supernovae, Nuclear Physics, Nuclear Spin, Statistical Analysis, Stellar Models

Scientific paper

The nuclear physics associated with neutron capture along the r-process path is reviewed, and it is noted that the usual statistical assumptions for the capture rates may not be valid. A comparison with statistical model calculations reveals that direct radiative capture may be the dominant reaction mechanism in the vicinity of and beyond the r-process path. The fact that the direct radiative capture mechanism represents a firm lower limit to the nuclear cross section is used to infer an upper limit of 1.5×1020 cm-3 for the critical neutron density necessary to guarantee (n, γ) equilibrium in the r-process.

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