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Dedicated to Professor Theo Mayer-Kuckuk on the occasion of his 60th birthdayThe excitation function of the fission probability PI(E~) for 238U has been measured in the reaction 238U(c~, ~'f) at 480 MeV bombarding energy. The reaction mechanism of this reaction is discussed for excitation energies below B,I, the threshold for second chance fission, and above B,I up to Ex = 37 MeV. In comparing with results from fission induced by photons and by particle transfer reactions the (~, c~'f) reaction gives too low values for the fission probability PI at excitation energies well above B,s. The role of the quasi-elastic knock-out process in this reaction is discussed.

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