Abstract
The role of the charge degree of freedom in the heavy-ion-induced fission was investigated by carrying out a systematic analysis of radiochemically observed charge distribution in the fission of238U with12C ions of the incident energy between 85 and 140 MeV, particularly in connection with the energy given to the compound system. The charge distribution was found to follow essentially identical systematics as those which govern the light-ion fission except for the extremely weak energy dependence of the most probable chargeZ p. That is, values of the derivative ofZ p with respect to the energy were found to be quite small, or nearly zero, in the heavy-ion fission as compared to those of the light-ion fission. According to an analysis combining the derivatives ofZ p and fission neutron data, it was deduced that the excess energy given to the fused system was spent completely in the form of pre-scission neutrons and hence the number of post-scission neutrons remained constant as in the case of light-ion fission. The observed charge distribution was reproduced under the conditions that the relaxation of the charge degree of freedom be very fast and that the separation between the two potential fragments at the moment when the charge degree of freedom has been frozen is determined by usingViola's systematics on the fragment kinetic energy.
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Yokoyama, A., Baba, H., Takahashi, N. et al. Charge degree of freedom as a sensitive probe for fission mechanism. J Radioanal Nucl Chem 223, 99–119 (1997). https://doi.org/10.1007/BF02223370
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DOI: https://doi.org/10.1007/BF02223370