FISSION OF HEAVY-NUCLEI INDUCED BY STOPPED ANTIPROTONS .2. CORRELATIONS BETWEEN FISSION FRAGMENTS

Antiproton-induced fission has been investigated with a novel double-a rm fission fragment spectrometer. The correlations in mass, energy, an d velocity between two fragments were measured. The dependence of tota l kinetic energy, velocity, momentum of the fissioning nucleus, and mo mentum of the fission fragments on the mass loss was deduced and analy zed in the framework of the dynamical statistical model. This model ta kes into account all stages before, during and after <(p)over bar-indu ced> fission (atomic cascade, intranuclear cascade, evaporation cascad e, fission of the compound nucleus, evaporation from the fission fragm ents). The mass loss was used as a measure of the excitation energy to classify the fission events according to the corresponding excitation energies. Some discrepancies between the model calculation and the ex periment show the important role of dissipative effects in the <(p)ove r bar-induced> fission process.