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The number of prompt neutrons emitted in the fission event have been measured separately for each complementary fragment in coincidence with fragment mass and kinetic energies in spontaneous fusion of 252 Cf, 244Cm, and 248 Cm. Two highly efficient Gd-loaded liquid scintillator tanks were used for the neutron registration. Approximately 3 x 10(6) fission events coincident with prompt neutron emission have been accumulated for each isotope. The mean neutron multiplicity, the dispersion and the covariance of the multiplicity distributions have been obtained as a function of fission fragment mass and kinetic energy. Dependencies of the moments of the multiplicity distributions on the fragment mass and total kinetic energy for different mass bins, as well as mass and total kinetic energy distributions of the fission fragments are presented, discussed and compared for the different isotopes investigated. The results showed a different behaviour of the moments of the multiplicity distribution depending on the fragment mass asymmetry that reflects changes in the dynamical effects for different fission modes. Possible reasons for the decrease of the neutron yield at low TKE of fission fragments are discussed.

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Authors: KALININ V A ET AL, V.G.Khlopin Radium Institute, St Petersburg (RU);VOROBYEV A S ET AL, Petersburg Nuclear Physics Institute, Gatchina (RU);HAMBSCH F-J, European Commission, Joint Research Centre, Institute for Reference Materials and Measurements, Geel (BE)
Bibliographic Reference: An oral report given at: 5th Conference on Dynamical Aspects of Nuclear Fission, 2001 Organised by: JINR, Dubna, Institute of Physics, Slovak Academy of Science Held at: Casta-Papernicka (SK), 23-27 October 2001
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