205 research outputs found
On the need of nuclear data and codes for the evaluation of heavy ion reaction cross sections
No full text
The Boltzmann Master Equation Theory, nuclear thermalization and pre-equilibrium reactions
No full textNuclear Thermalization
No full textThe thermalization of a composite nucleus formed when two heavy ion fuse, that is the transformation of the orderly translational motion energy of the two ions into chaotic, thermal motion energy may be described by a set of Boltzmann master equations which allow one to calculate the time evolution of the single nucleon energies within the composite nucleus. The theoretical assumptions and the results of the analysis of the experimental data are discussed
Intermediate mass fragment emission in Boltzmann master equation theory of pre–equilibrium reactions
No full textA coalescence model originally proposed to account for the emission of nucleons and light particles in nuclear reactions is extended to account for intermediate mass fragment (IMF) emission. This theory uses a set of Boltzmann master equations to evaluate the time evolution of the occupation probability of nucleon states in the course of the de-excitation cascade during which the IMF are emitted. The internal structure of the IMF and the depletion of nucleon states due to IMF emission are explicitly considered. The theoretical predictions reproduce satisfactorily the experimental multiplicity spectra measured in central collisions of36Ar ions with197Au at incident energies of 35 MeV/nucleon
Ejectile angular distributions in Boltzmann master equation theory of nuclear reactions
No full textIn this letter we discuss how one may evaluate the ejectile angular distributions with the Boltzmann Master Equation theory of nuclear reactions. The comparison of the calculations with the experimental ejectile double differential spectra is satisfactory confirming the validity of the theory. The possibility, offered by present calculations, of estimating how the nucleon momentum correlation disappears with increasing time, allows one to predict more accurately than with previous calculations the absolute value of the cross-sections for complex particle emission
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