Abstract

The slowing down of fission fragments from the spontaneous fission of 252-californium has been studied in the absorbers Au, Ag, Cu, Al, C and in plastic material (Formvar). The energy degradation of the mean light and heavy fragment after passage through sell-supporting foils of different thicknesses was measured using semiconductor detectors. The measurements were carried through in an energy range, where electronic collisions predominate, the lower energy limit being approx. 20 and 30 MeV for the heavy and light fragments respectively. Comparison with existing theories shows the specific energy loss to be higher than the predicted one.

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