Parameter of equilibrium charge states distribution width for calculation of heavy recoil spectra

Energy and time-of-flight spectra of heavy nuclei were calculated using a PC-based code with a q2 scaling of the energy loss in low pressure hydrogen, filling the working volume of the gas filled separator at a pressure of about 1 Torr. The χ2 distribution is used to describe the charge distribution of heavy nuclei passing through hydrogen. The measured recoil spectra used to extract the optimum parameter of equilibrium charge states distribution width were obtained in the heavy ion induced 197Au + 22Ne, natW + 34S and 206Pb + 48Ca reactions. A brief description of the detecting module of the Dubna Gas-Filled Recoil Separator (GFRS) is presented and precedes the calculation description.