Investigation of spatial and energy distribution of neutrons in the uranium-lead assembly under bombardment with relativistic protons with energy of 1,5 GeV

Investigation of spatial and energy distribution of neutrons in the uranium-lead assembly consisting of the extended lead target and the blanket from natural uranium surrounding it under bombardment with relativistic protons with the energy of 1,5 GeV obtained at the synchrophasotron of the laboratory of High Energy of the JINR (Dubna, Russia) are described. The results of measurement and calculation of fission rater distribution of U 235, U 238 and Th 232 are presented, as well as threshold spectral indices σf232Th/σf235U as to the radius of the target and the blanket of the U/Pb-assembly. The result of measurement and calculation of fission rates of U 234, U 236, Np 237 an spectral indices σfi/σf235U (i - U 234, U 236, Np 237) in the blanket of the installation are also given. Measurements have been carried out using the method of solid state track detectors and been accompanied by calculations executed by the Monte-Carlo simulation using DCM/CEM program (authors)