Abstract
The results of coincidence measurements of4He emission with fission fragments in reactions of12C(108 MeV) ions with a197Au target and of16O(144 MeV) ions with a232Th target are presented. On the basis of a Monte Carlo kinematic simulation of nuclear reactions the experimental energy spectra and velocity distributions of alpha particles have been analyzed. A conclusion has been drawn that the main source of4 He emission is evaporation from the fissioning compound nucleus. Substantial part of alpha particles was emitted from fully accelerated fission fragments. Some of4He nuclei with an average energy of about 16 MeV (in the CM system) emitted mainly perpendicular to the fission axis were identified as being similar long-range alpha particles produced in ternary fission of heavy nuclei at a low excitation energy. The emission multiplicities of these particles are considerably higher than those observed at a low excitation energy. The experimental results are compared with the statistical model predictions.
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The authors thank Academician G.N. Flerov and Prof. Yu.Ts. Oganessian for the possibility of carrying out the experiments, Yu.A. Muzychka and B.I. Pustylnik for the statistical model calculations and fruitful discussions, Yu.E. Pienionzhkevich for his help and assistance, as well as V.G. Sandukowski for preparing position-sensitive detectors.
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Sowiński, M., Lewitowicz, M., Kupczak, R. et al. Ternary fission involving4He emission in the16O (144 MeV)+232Th and12C (108 MeV)+197Au reactions. Z. Physik A - Atomic Nuclei 324, 87–95 (1986). https://doi.org/10.1007/BF01290759
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DOI: https://doi.org/10.1007/BF01290759