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Effet du milieu sur la propagation des neutrinos dans la matière nucléaire

Abstract : We study the elementary interactions between neutrinos and dense matter in a protoneutron star. Equations of state obtained with different nuclear effective interactions (Skyrme, Gogny, Relativistic Lagrangians) are first discussed. Then, we characterize their stability in spin and isospin. We derive magnetic susceptibilities for all isospin asymmetry values as a function of Landau parameters. From this work, we select a parametrization for each of the 3 effective forces : Sly230b,D1P,NL3.We calculate the pure neutron matter and asymmetric nuclear matter response functions with and without charge exchange, describing nuclear correlations in both approaches : nonrelativistic (Hartree-Fock with Skyrme forces, then complete RPA) and relativistic (in the Hartree approximation). At the end, we calculate neutrino mean free paths for neutral current and charged current reactions. Comparisons between relativistic and non-relativistic approaches allow us to identify relativistic effects in nuclear matter at densities as low as twice the saturation density. RPA correlations make the medium more transparent to neutrinos compared to free Fermi gas. The importance of the effective mass in mean free path calculations is also shown.
Mots-clés : Théorie
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Submitted on : Friday, June 14, 2002 - 1:21:17 PM
Last modification on : Wednesday, September 16, 2020 - 4:07:55 PM
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  • HAL Id : tel-00001429, version 1



Jérôme Margueron. Effet du milieu sur la propagation des neutrinos dans la matière nucléaire. Physique mathématique [math-ph]. Université Paris Sud - Paris XI, 2001. Français. ⟨tel-00001429⟩



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