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Structure of the mass distributions of the products of thermal-neutron fission of /sup 235/U and /sup 239/Pu for a fixed energy of the fission products

A. Belyaev, Z.S. Bikbova, Vladimir Kogan, A. I. Muminov, V.P. Pikul, A.M. Usmandiyarov

Abstract

Relative mass yields of the fission products of thermal-neutron fission of /sup 235/U and /sup 239/Pu have been determined for six values of the kinetic energy E/sub k/. A fine structure is observed at A = 137 and an anomalously low yield at A = 139. Mass distributions of fission products of the heavy group are presented for a fixed value of the total kinetic energy. At low values of the total kinetic energy the appearance of structural features is observed. The dependence of the half-width of the mass distribution on E/sub k/ is given.

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Key concepts: Fission, Kinetic energy, Fission product yield, Fission products, Neutron temperature, Mass distribution, Nuclear physics, Yield (engineering)