  Within the Time Dependent Hartree Fock (TDHF) approach, we investigate the
impact of several ingredients of the nuclear effective interaction, such as
incompressibility, symmetry energy, effective mass, derivative of the Lane
potential and surface terms on the exit channel (fusion vs quasifission)
observed in the reaction $^{238}$U+$^{40}$Ca, close to the Coulomb barrier. Our
results show that all the ingredients listed above contribute to the
competition between fusion and quasifission processes, however the leading role
in determining the outcome of the reaction is played by incompressibility,
symmetry energy and the isoscalar coefficient of the surface term. This study
unravels the complexity of the fusion and quasifission reaction dynamics and
helps to understand the microscopic processes responsible for the final outcome
of low energy heavy ion collisions in terms of relevant features of the nuclear
effective interaction and associated equation of state (EoS).
