Direct and sequential radiative three-body reaction rates at low temperatures |
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Authors: | E Garrido R de Diego D V Fedorov A S Jensen |
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Institution: | 1.Instituto de Estructura de la Materia,CSIC,Madrid,Spain;2.Department of Physics and Astronomy,Aarhus University,Aarhus C,Denmark |
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Abstract: | We investigate the low-temperature reaction rates for radiative capture processes of three particles. We compare direct and
sequential capture mechanisms and rates using realistic phenomenological parametrizations of the corresponding photodissociation
cross-sections. Energy conservation prohibits sequential capture for energies smaller than that of the intermediate two-body
structure. A finite width or a finite temperature allows this capture mechanism. We study generic effects of positions and
widths of two- and three-body resonances for very low temperatures. We focus on nuclear reactions relevant for astrophysics,
and we illustrate with realistic estimates for the α-α-α and α-α-n radiative capture processes. The direct capture mechanism leads to reaction rates which for temperatures smaller than 0.1
GK can be several orders of magnitude larger than those of the NACRE compilation. |
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Keywords: | |
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