HAL : in2p3-00274331, version 1
 arXiv : 0804.2823
 Physical Review C 78 (2008) 024610
 Energy dependence of nucleus-nucleus potential close to the Coulomb barrier
 K. Washiyama1, 2, D. Lacroix1
 (2008)
 The nucleus-nucleus interaction potentials in heavy-ion fusion reactions are extracted from the microscopic time-dependent Hartree-Fock theory for mass symmetric reactions $^{16}$O${}+^{16}$O, $^{40}$Ca${}+^{40}$Ca, $^{48}$Ca${}+^{48}$Ca and mass asymmetric reactions $^{16}$O$+^{40,48}$Ca, $^{40}$Ca${}+^{48}$Ca, $^{16}$O+$^{208}$Pb, $^{40}$Ca+$^{90}$Zr. When the center-of-mass energy is much higher than the Coulomb barrier energy, potentials deduced with the microscopic theory identify with the frozen density approximation. As the center-of-mass energy decreases and approaches the Coulomb barrier, potentials become energy dependent. This dependence signs dynamical reorganization of internal degrees of freedom and leads to a reduction of the "apparent" barrier felt by the two nuclei during fusion of the order of $2-3 %$ compared to the frozen density case. Several examples illustrate that the potential landscape changes rapidly when the center-of-mass energy is in the vicinity of the Coulomb barrier energy. The energy dependence is expected to have a significant role on fusion around the Coulomb barrier.
 Thème(s) : Physique/Physique Nucléaire Théorique
 Lien vers le texte intégral : http://fr.arXiv.org/abs/0804.2823
 in2p3-00274331, version 1 http://hal.in2p3.fr/in2p3-00274331 oai:hal.in2p3.fr:in2p3-00274331 Contributeur : Michel Lion <> Déposé pour le compte de : Denis Lacroix <> Soumis le : Vendredi 18 Avril 2008, 10:09:48 Dernière modification le : Lundi 13 Octobre 2008, 15:52:14