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AbstractAbstract
[en] Heavy-ion fusion-evaporation and nucleon transfer reactions at energies close to the Coulomb barrier play an essential role in the study of nuclear structure and reaction dynamics. In the framework of this PhD thesis, two fusion-evaporation and nucleon transfer experiments have been performed at the Laboratori Nazionali di Legnaro in Italy: 40Ca + 58Ni and 40Ca + 64Ni. In a first experiment, fusion cross sections for 40Ca + 58,64Ni have been measured from above to below the Coulomb barrier and have been interpreted by means of coupled-channels and Time-Dependent Hartree-Fock (TDHF) calculations. The results show the importance of the one-phonon octupole excitation in the 40Ca nucleus and the one-phonon quadrupole excitations in the 58Ni and 64Ni nuclei, as well as the importance of the nucleon transfer channels in the neutron-rich system 40Ca + 64Ni. In a complementary experiment, nucleon transfer probabilities for 40Ca + 58,64Ni have been measured in the same energy region as the previous experiment and have been interpreted by performing TDHF+BCS calculations. The results confirm the importance of nucleon transfer channels in 40Ca + 64Ni. A simultaneous description of the nucleon transfer probabilities and the fusion cross sections has been performed for both reactions, using a coupled-channels approach. (author)
[fr]
Les reactions de fusion-evaporation et de transfert de nucleons entre ions lourds a des energies proches de la barriere de Coulomb jouent un role essentiel dans l'etude de la structure nucleaire et des mecanismes de reaction. Dans le cadre de cette these, deux experiences de fusion-evaporation et de transfert de nucleons ont ete realisees au Laboratoire National de Legnaro en Italie: 40Ca + 58Ni et 40Ca + 64Ni. Dans une premiere experience, les sections efficaces de fusion de 40Ca + 58,64Ni ont ete mesurees a des energies au-dessus et en dessous de la barriere de Coulomb et ont ete interpretees a l'aide de calculs en voies couplees et Hartree-Fock dependants du temps (TDHF). Les resultats montrent l'importance de l'excitation a un phonon octupolaire dans le noyau 40Ca et les excitations a un phonon quadripolaire dans les noyaux 58Ni et 64Ni, ainsi que l'importance des voies de transfert de nucleons dans le systeme riche en neutrons 40Ca + 64Ni. Dans une experience complementaire, les probabilites de transfert de nucleons de 40Ca + 58,64Ni ont ete mesurees dans le meme domaine d'energie que l'experience precedente et ont ete interpretees en effectuant des calculs TDHF+BCS. Les resultats confirment l'importance des voies de transfert de nucleons dans 40Ca + 64Ni. Une description conjointe des probabilites de transfert de nucleons et des sections efficaces de fusion a ete realisee pour les deux reactions etudiees en utilisant une approche en voies couplees. (auteur)Original Title
Reactions de fusion entre ions lourds par effet tunnel quantique: le cas des collisions entre calcium et nickel
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26 Sep 2016; 183 p; 117 refs.; Available from the INIS Liaison Officer for France, see the INIS website for current contact and E-mail addresses; These Docteur de l'Universite de Strasbourg, Specialite: Constituants elementaires
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