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Variation of fundamental constants and the triple-alpha reaction in Population III stars and BBN
Coc A.
Dans Nuclear Physics in Astrophysics V - Journal of physics Conference Series - 5th Biannual Conference on Nuclear Physics in Astrophysics (NPA)/24th Nuclear Physics Divisional Conference of the European-Physical-Society (EPS), Eliat : Israël (2011) - http://hal.in2p3.fr/in2p3-00683038
Physique/Astrophysique/Astrophysique stellaire et solaire
Planète et Univers/Astrophysique/Astrophysique stellaire et solaire
Variation of fundamental constants and the triple-alpha reaction in Population III stars and BBN
A. Coc1
1 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
http://www-csnsm.in2p3.fr/
CNRS : UMR8609 – IN2P3 – Université Paris XI - Paris Sud
batiments 104 et 108 - 91405 Orsay Campus
France
CSNSM AN
The effect of variations of the fundamental constants on the thermonuclear rate of the triple alpha reaction, 4He(αα, γ)12C, that bridges the gap between 4He and 12C is investigated. We have followed the evolution of 15 and 60 Mbigodot zero metallicity stellar models, up to the end of core helium burning. The calculated oxygen and carbon abundances resulting from helium burning can then be used to constrain the variation of the fundamental constants. To investigate the effect of an enhanced triple alpha reaction rate in Big-Bang Nucleosynthesis, we first evaluated Standard Big-Bang Nucleosynthesis CNO production with a network of more than 400 reactions using the TALYS code to calculate missing rates.

Communications avec actes
02/2012
2011
Nuclear Physics in Astrophysics V - Journal of physics Conference Series
internationale
337
Auerbach, N; Hass, M; Paul, M
012037
IOP Publishing

5th Biannual Conference on Nuclear Physics in Astrophysics (NPA)/24th Nuclear Physics Divisional Conference of the European-Physical-Society (EPS)
Eliat
Israël
03/04/2011
03/04/2011
A. Coc

CSNSM AN
25.55.-e 3H-, 3He-, and 4He-induced reactions 95.30.Cq Elementary particle processes 26.35.+c Big Bang nucleosynthesis 27.10.+h A(less-than-or-equal-to)5 97.10.Cv Stellar structure, interiors, evolution, nucleosynthesis, ages
THERMONUCLEAR REACTION-RATES – NUCLEAR-REACTION RATES – COMPILATION – EVOLUTION