| Thème(s) : |
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| Titre : |
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Variation of fundamental constants and the triple-alpha reaction in Population III stars and BBN |
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| Auteur : |
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A. Coc1 |
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| Laboratoire : |
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| équipe(s) de recherche : |
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CSNSM AN |
| Résumé : |
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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. |
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| Type de publication : |
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Communications avec actes |
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Date de publication
ou d'écriture : |
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02/2012 |
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| Date de la présentation : |
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2011 |
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Nom du périodique
Titre de l'ouvrage : |
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Nuclear Physics in Astrophysics V - Journal of physics Conference Series |
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| Audience : |
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internationale |
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| Volume : |
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337 |
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| Editeurs scientifiques : |
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Auerbach, N; Hass, M; Paul, M |
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| Page/Article : |
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012037 |
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| Editeur : |
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IOP Publishing |
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| Nom du colloque : |
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5th Biannual Conference on Nuclear Physics in Astrophysics (NPA)/24th Nuclear Physics Divisional Conference of the European-Physical-Society (EPS) |
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| Ville du colloque : |
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Eliat |
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| Pays du colloque : |
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Israël |
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| Date du colloque (début) : |
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03/04/2011 |
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| Date du colloque (fin) : |
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03/04/2011 |
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| Speaker : |
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A. Coc |
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| Identifiant local : |
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CSNSM AN |
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| Classification PACS : |
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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 |
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| Mot(s)-clé(s) : |
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THERMONUCLEAR REACTION-RATES – NUCLEAR-REACTION RATES – COMPILATION – EVOLUTION |
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