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Sub-barrier fusion of Si+Si systems: does the deformation of ${}^{28}Si$ play a role?

Colucci G., Montagnoli G., Stefanini A.M., Bourgin D., Colovic P., Corradi L., Faggian M., Fioretto E., Galtarossa F., Haas F., Mazzocco M., Scarlassara F., Stefanini C., Strano E., Urbani M., Zhang G.L.
  Mercoledì 28/09   10:00 - 13:00   Edificio Psicologia 2 - Aula 3F   I - Fisica nucleare e subnucleare
This contribution reports on the results of measurements of near- and sub-barrier fusion cross sections in the system ${}^{30}Si+{}^{30}Si$ performed at the Laboratori Nazionali di Legnaro of INFN. The extension of the excitation function of this system has allowed a detailed comparison with ${}^{28}Si+{}^{28}Si$ system, which is interesting because of the different shape of the ${}^{28}Si$ nucleus, which is deformed, with respect to the spherical ${}^{30}Si$. This condition allows to neglect the rotational states which are strongly present in the nucleus ${}^{28}Si$ and has a remarkable impact on the energy dependence of fusion cross sections at sub-barrier energies.