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[en] The derivation of a collision term extending time-dependent mean-field theories to describe the equilibration in finite fermion systems due to the residual interaction is discussed. Numerical results based on a relaxation ansatz for the collision term exhibit its qualitative effect. The equation for the time-dependent occupation numbers of the s.p. orbits is reduced to a non-linear partial differential equation which is solved analytically. In the equilibrium limit, a Fermi-type distribution for the occupation numbers is attained

[en] The forward scattering amplitude approximation and impulse approximation in the framework of Kerman-McManus-Thaler formalism, generalized to include the case of nucleus-nucleus scattering, is used to derive an analytical expression for the α-nucleus absorptive potential. Application to α-₁₂C and α-₁₆O scattering is made

[en] The angular-momentum distributions of both fragments in deeply inelastic collisions are calculated in a nonequilibrium statistical model. The distribution functions are obtained analytically on the basis of a transport equation. Fragment angular-momentum distributions are computed as functions of energy loss and compared to data

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[en] In order to investigate the behaviour of nucleon transfer near the Coulomb barrier through the produced radioactivities, we have studied the ₆₀Ni+₁₂₄Sn system, the residual activity measurements were done at three lab energies of 237, 247 and 258 MeV (Bsub(c)(lab) = 234 MeV). For the highest energy we measured also the angular distribution. In addition to activities corresponding to a few nucleon transfers and evaporation residues, a large number of radioactive nuclei was found, which could be attributed to another class of reaction mechanism. Here, we report on this new phenomenon, which might be due to a super-multi-nucleon transfer, on the basis of the measured angular and mass distributions

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[en] Slow collective nuclear motions such as heavy-ion collision slightly above the Coulomb barrier and induced nuclear fission imply collective velocities. In the vicinity of quasi-crossings of adiabatic levels the nuclear single-particle motion changes completely. A nucleon in the lower level before the crossing will find itself in the upper level if this has been unoccupied before and the nucleon will stay in the diabatic level. The diabatic potential now corresponds to the extra energy pumped into the system due to the diabatic production of particle-hole state. An interesting aspect of diabatic s.p. states is their connection with non-equilibrium neutron or proton emission in heavy-ion collisions. Several neutrons could be emitted of the s.p. states to the collective motion which produces highly excited s.p. states

No abstract available