Abstract
The systems of intermediate fissility 132 Ce and 158 Er have been studied experimentally and theo- retically in order to investigate the dissipation properti es of nuclear matter. Cross sections of fusion-fission and evaporation residues channels together with charged particles multiplicities in both channels, their spectra, an- gular correlations and mass-energy distribution of fission fragments have been measured. Theoretical analysis has been performed using multi-dimensional stochastic approach with realistic treatment of particle evaporation. The results of analysis show that full one-body or unusually strong two-body dissipation allows to reproduce experimental data. No temperature dependent dissipation was needed.
Highlights
The dissipation properties of nuclear matter are still an attractive subject in experimental and theoretical investigations with heavy-ion reactions
In the case of two-body dissipation one needs to use unusually strong value of ν0 ≃ 0.15 ×10−21 MeV s f m−3 in order to get the best description of the experimental data in agreement with previous findings of Ref. [15], where the value ν0= 0.125 ×10−21 MeV s f m−3 has been found more suitable for the description of experimental npre, σFF, and σER values for 200Pb
To summarize the findings of our study, one can conclude that full one-body or unusually strong two-body dissipation allows to reproduce a wide set of observables
Summary
The dissipation properties of nuclear matter are still an attractive subject in experimental and theoretical investigations with heavy-ion reactions. During last decades many efforts have been undertaken to a precise determination of the fission time scale, the nature of dissipation and its dependence on the temperature and deformation. At issue is whether nuclear dissipation proceeds primarily by means of individual two-body collision (two-body friction [1]), as the case of ordinary fluids, or by means of nucleons colliding with a moving potential wall (onebody friction [2]). The estimations given by different authors predict a quite wide range of dissipation strengths and different dependencies on temperature and deformation (see reviews [3,4] and references therein). The lack of experimental constraints to the model appears to be, in several cases, one of the source of controversial results
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