Structure of fission product mass distribution of 235U and 239Pu nuclei by thermal neutrons at fixed energies of the fission products

Relative mass yield have been determined for fission products of 235U and 239Pu nuclei induced by thermal neutrons at six values of the kinetic energy. Esub(k). A fine structure for A=137 and an abnormally low yield for A=139 have been observed. Mass distributions are presented for heavy grouo fission products at fixed values of the total kinetic energy. A structure appearing at low magnetudes of the total kinetic energy has been detected. A Esub(k) dependence of the mass distriubution half-width is given