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The microscopic description of nuclear fission still remains a topic ofintense basic research. Un- derstanding nuclear fission, apart from atheoretical point of view, is of practical importance for energy production andthe transmutation of nuclear waste. In nuclear astrophysics, fission sets theupper limit to the nucleosynthesis of heavy elements via the r-process. In thiswork we initiated a systematic study of intermediate energy proton-inducedfission using the Constrained Molecu- lar Dynamics (CoMD) code. The CoMD codeimplements an effective interaction with a nuclear matter compressibility ofK=200 (soft EOS) with several forms of the density dependence of thenucleon-nucleon symmetry potential. Moreover, a constraint is imposed in thephase-space occu- pation for each nucleon restoring the Pauli principle at eachtime step of the collision. A proper choice of the surface parameter of theeffective interaction has been made to describe fission. In this work, wepresent results of fission calculations for proton-induced reactions on : a)232 Th at 27 and 63 MeV, b) 235 U at 10, 30, 60 and 100 MeV, and c) 238 U at100 and 660 MeV. The calculated observables include fission-fragment massdistributions, total fission energies, neutron multiplicities and fissiontimes. These observables are compared to available experimental data. We showthat the microscopic CoMD code is able to describe the complicated many-bodydynamics of the fission process at intermediate and high energy and give areasonable estimate of the fission time scale. Sensitivity of the results tothe density dependence of the nucleon symmetry potential (and, thus, thenuclear symmetry energy) is found. Further improvements of the code arenecessary to achieve a satisfactory description of low energy fission in whichshell effects play a dominant role.

Microscopic dynamical description of proton-induced fission with the Constrained Molecular Dynamics (CoMD) Model