Abstract
The exclusive measurements of reactions induced by 1050 MeV 84Kr ions incident on natural uranium have been made with the help of mica track detectors used in a 27 π-configuration. The cross sections for ternary and quarternary events have been determined by directly counting the numbers of events of relevant multiplicities. The angular distribution in the case of elastic events has been fitted by a generalized Fresnel model with parameters θ 1 4 ( c.m.) = (33.5 ± 0.5)° and Δ = 8.5 ± 5. A complete kinematical picture of the reaction process has been deduced by converting the three-dimensional track parameters (lengths and angles) into parameters of reaction products (masses and energies) on an event by event basis. An empirical velocity-range relation has been used for this purpose, which has been obtained by an internal calibration procedure. It has been found that the reaction mechanism for the bulk of the data can be described as a sequential fission process. However, non-equilibrium effects appear for a small number of events (about 8%) in the three-body channel and completely dominate the four-body channel. In order to estimate the uncertainties of the computed quantities in relation to the measurement errors, Monte Carlo simulation of the selected data sets has also been performed.
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