Astrophysical implications of the proton–proton cross section updates

Autor: Emanuele Tognelli, P. G. Prada Moroni, Laura Elisa Marcucci, Scilla Degl'Innocenti
Rok vydání: 2015
Předmět:
Zdroj: Physics Letters B, Vol 742, Iss, Pp 189-194 (2015)
Physics Letters B
ISSN: 0370-2693
Popis: The p(p,e^+ \nu_e)^2H reaction rate is an essential ingredient for theoretical computations of stellar models. In the past several values of the corresponding S-factor have been made available by different authors. Prompted by a recent evaluation of S(E), we analysed the effect of the adoption of different proton-proton reaction rates on stellar models, focusing, in particular, on the age of mid and old stellar clusters (1-12 Gyr) and on standard solar model predictions. By comparing different widely adopted p(p,e^+ \nu_e)^2H reaction rates, we found a maximum difference in the temperature regimes typical of main sequence hydrogen-burning stars (5x10^6 - 3x10^7 K) of about 3%. Such a variation translates into a change of cluster age determination lower than 1%. A slightly larger effect is observed in the predicted solar neutrino fluxes with a maximum difference, in the worst case, of about 8%. Finally we also notice that the uncertainty evaluation of the present proton-proton rate is at the level of few \permil, thus the p(p,e^+ \nu_e)^2H reaction rate does not constitute anymore a significant uncertainty source in stellar models.
Comment: accepted
Databáze: OpenAIRE
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