1963•OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information)Requires access
THE KINETIC ENERGY AND THE ANGULAR DISTRIBUTION OF THE NEUTRON- AND PHOTON- INDUCED FISSION FRAGMENTS OF URANIUM-238
B.A. Bochagov, A.P. Komar, V.I. Fadeev
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Abstract
A study was made to determine whether the creation of symmetric and asymmetric fission products is or is not due to the same fission mechanism. The factors studied include the excitation energy of the fissioning atom, the yield of the products, the angular distribution, and the effect of the spin state of the component nuclei. Measurements were made to determine the energy and angalar distribution of the products resulting from the fission of U/sup 238/ by 14- Mev neutrons and by photons with an E/sub max/, = 35 Mev, using a double-pulse type ionization chamber. The most probable total kinetic energy at various given mass ratios of the fission products was determined for 5 integrals of the angle between the direction of the emission of the fission products and that of the neutron beam or gamma -quanta by recording 3 pulses for each fission. A 150 mu g/cm/sup 2/ thick uranyl acetate layer deposited on an aluminized film was used for the tests; a neutron generator and a synchrotron served as the bombarding source. The results indicated that for both symmetric and asymmetric fission product masses the kinetic energy of the products remains unchanged as the angle is varied. Frommore » this it is concluded that the rotation energy is small and even though the moments of inertia of the symmetrically and asymmetrically fissioning nuclei are different, this difference does not affect markedly the rotational energy. (TTT)« less