Multifragmentation and Symmetry Energy Studied with Antisymmetrized Molecular Dynamics
نویسنده
چکیده
The antisymmetrized molecular dynamics (AMD) simulations suggest that the isospin composition of fragments produced dynamically in multifragmentation reactions is basically governed by the symmetry energy of low-density uniform nuclear matter rather than the symmetry energy for the ground-state finite nuclei. After the statistical secondary decay of the excited fragments, the symmetry energy effect still remains in the fragment isospin composition, though the effect in the isoscaling parameter seems a very delicate problem.
منابع مشابه
Symmetry energy for fragmentation in dynamical nuclear collisions
We extract values for the free symmetry energy as a function of the fragment size (the proton number Z) from antisymmetrized molecular dynamics (AMD) calculations of calcium collisions. Simple statistical physics describe well the distribution of hot nuclei at breakup, provided the surface symmetry term in the free energy is much smaller at high excitation than in ground state nuclei. This resu...
متن کاملIsospin Effect on the Process of Multifragmentation and Dissipation at Intermediate Energy Heavy Ion Collisions
In the simulation of intermediate energy heavy ion collisions by using the isospin dependent quantum molecular dynamics, the isospin effect on the process of multifragmentation and dissipation has been studied. It is found that the multiplicity of intermediate mass fragments Nimf for the neutron-poor colliding system is always larger than that for the neutron-rich system, while the quadrupole o...
متن کاملAntisymmetrized molecular dynamics with quantum branching processes for collisions of heavy nuclei
Antisymmetrized molecular dynamics (AMD) with quantum branching processes is reformulated so that it can be applicable to the collisions of heavy nuclei such as 197Au + 197Au multifragmentation reactions. The quantum branching process due to the wave packet diffusion effect is treated as a random term in a Langevin-type equation of motion, whose numerical treatment is much easier than the metho...
متن کاملFermionic Molecular Dynamics
A quantum molecular model for fermions is investigated which works with antisymmetrized many–body states composed of localized single–particle wave packets. The application to the description of atomic nuclei and collisions between them shows that the model is capable to address a rich variety of observed phenomena. Among them are shell effects, cluster structure and intrinsic deformation in gr...
متن کامل90 20 v 2 1 D ec 2 00 0 Classification of the Nuclear Multifragmentation Phase Transition
The phenomenon of heavy-ion collision induced nuclear multifragmentation (NMF) has been extensively studied over the past decade. Experimentally it is found that nuclei with excitation energies of E/A = 5-10 MeV, i.e. in the region of the binding energy, expand forming a number of intermediate mass fragments [1]. Using subtle and advanced experimental techniques from a number of collision exper...
متن کامل