Cross section of the californium 249 photofission

Measurements of 249Cf nuclei photofission cross sections are carried out, in particular, the measurements of 232Th and 238U nuclei photofission yields are repeated. Bremsstrahlung of MT-22 microtron is used for nuclei fission. The experimental techniques are described. Experimental values of 232Th, 238U and 249Cf photofission yields are presented depending on the energy of electrons which bombard the bremsstrahlung target. Calculated cross sections are compared with the experimental values of the photofission yield of the nuclei under consideration; their approximation functions are derived. The reduced cross sections of the photofission of these nuclei depending on the energy of bremsstrahlung photons are presented. The cross section of 249Cf photofission which has been measured for the first time, equals 310 mb. 8 refs., 3 figs., 1 tab