Influence of the impact parameter on element distributions in dissipative heavy-ion collisions

摘要: The $^{209}\mathrm{Bi}$+ $^{136}\mathrm{Xe}$ reaction at laboratory bombarding energies of 940, 1130, and 1422 MeV is interpreted on the basis a phenomenological classical model diffusion for damped collisions. Initial angular momenta, interaction times, charge coefficients are deduced with above models from experimental data reported previously. energy dependence parameters effect deformation dinuclear system in exit channel discussed. An analytical relation suggested between variance ${{\ensuremath{\sigma}}_{Z}}^{2}$ element distribution ratio $\frac{E}{{l}_{g}}$, where $E$ measured final total kinetic ${l}_{g}$ grazing orbital momentum. This semiempirical formula applied to sixteen heavy-ion systems well Coulomb barrier. In plot $\mathrm{ln}{{\ensuremath{\sigma}}_{Z}}^{2}$ versus $\frac{E}{{l}_{g}}$ all fall parallel lines displacements that reasonably correlated $\frac{{E}_{0}}{{l}_{g}}$, ${E}_{0}$ c.m. system. model-dependent explanation this empirical relation, evidence found distributions determined by initial relative momentum $\frac{l}{{l}_{g}}$.NUCLEAR REACTIONS $^{209}\mathrm{Bi}$($^{136}\mathrm{Xe}$,HI), ${E}_{\mathrm{lab}}=940, \mathrm{and} 1422$ MeV; momentum, time coefficient; strongly reaction; systematics heavyion data.