Temperature dependence of modified CNO nuclear reaction rates in dense stellar plasmas

Details Temperature dependence of modified CNO nuclear reaction rates in dense stellar plasmas Temperature dependence of modified CNO nuclear reaction rates in dense stellar plasmas

2003-12-24

arxiv.org/abs/nucl-th/0312106v1

Physica A340 (2004) 477-482

Physics

Nuclear Physics

Nuclear Theory

Presented at NEXT2003 (Second International Conference on "News and Expectations in Thermostatistics"), Villasimius (Cagliari)

Scientific paper

10.1016/j.physa.2004.04.043

We study the dependence of the CNO nuclear reaction rates on temperature, in the range of $10^7\div 10^8$ K, the typical range of temperature evolution from a Sun-like star towards a white dwarf. We show that the temperature dependence of the CNO nuclear reaction rates is strongly affected by the presence of non-extensive statistical effects in the dense stellar core. A very small deviation from the Maxwell-Boltzmann particle distribution implies a relevant enhancement of the CNO reaction rate and could explain the presence of heavier elements (e.g. Fe, Mg) in the final composition of a white dwarf core. Such a behavior is consistent with the recent experimental upper limit to the fraction of energy that the Sun produces via the CNO fusion cycle.

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