Elsevier

Nuclear Physics A

Volume 99, Issue 1, 15 June 1967, Pages 41-54
Nuclear Physics A

Mesure précise, dans la région des masses symétriques, de l'énergie cinétique des fragments de la fission thermique de l'235U

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Abstract

Energy correlation experiments with fission fragments are strongly perturbed by false events in the symmetric region. We show that the measurement of an additional parameter, namely the difference in time-of-flight between the fragments, enables us to eliminate these difficulties.

For thermal fission of 235U, values of mass yields in the symmetric region are found to agree quantitatively with radiochemical values. Moreover, the average total kinetic energy as a function of the pre-neutron-emission mass has been calculated. This curve presents a large dip at symmetry with a maximum to minimum difference of 21.2 ± 0.8 MeV, which is smaller than previously published results.

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