Quasifission processes in $^{40,48}$Ca+$^{144,154}$Sm reactions
Résumé
Mass-energy and angular distributions of fission fragments for the $^{48}$Ca+$^{144,154}$Sm \to $^{192,202}$Pb, $^{40}$Ca+$^{154}$Sm \to $^{194}$Pb reactions have been measured. Fusion suppression and the presence of quasifission at energies near and below the Coulomb barrier have been observed for the reactions with the deformed target $^{154}$Sm. In the case of the spherical $^{144}$Sm target no evidence of quasifission has been found. Quasifission cross sections have been extracted from total fission-like events by analysis of their mass and angular distributions.