Fusion reactions in multicomponent dense matter

Details Fusion reactions in multicomponent dense matter Fusion reactions in multicomponent dense matter

2006-08-23

arxiv.org/abs/astro-ph/0608488v1

Phys.Rev. C74 (2006) 035803

Astronomy and Astrophysics

Astrophysics

16 pages, 5 figures, to appear in Phys. Rev. C

Scientific paper

10.1103/PhysRevC.74.035803

We analyze thermonuclear and pycnonuclear fusion reactions in dense matter containing atomic nuclei of different types. We extend a phenomenological expression for the reaction rate, proposed recently by Gasques et al. (2005) for the one-component plasma of nuclei, to the multi-component plasma. The expression contains several fit parameters which we adjust to reproduce the best microscopic calculations available in the literature. Furthermore, we show that pycnonuclear burning is drastically affected by an (unknown) structure of the multi-component matter (a regular lattice, a uniform mix, etc.). We apply the results to study nuclear burning in a carbon_12-oxygen_16 mixture. In this context we present new calculations of the astrophysical S-factors for carbon-oxygen and oxygen-oxygen fusion reactions. We show that the presence of a CO lattice can strongly suppress carbon ignition in white dwarf cores and neutron star crusts at densities > 3e9 g cm^{-3} and temperatures T<1e8 K.

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