The calculations of quasistationary Kr and Xe beam-produced plasma parameters were performed in the range of gas densities N_a from 10¹⁹ up to 10²¹ cm^-3 and ionization degrees N_c/N_a from 10^-5 up to 10^-3. The values of ion and electron densities, populations of excited states and electron temperature T_c depending on external ionization rate were obtained in the way of proper balance equation system solving. The main mechanisms responsible for BPP parameters forming were analyzed. Obtained results (specifically, T_c from 0.4 up to 0.8 eV) are distinguished with available information in publications.