Abstract
Nuclear fission accompanied by long-range alpha particles has been investigated. Fission was induced by irradiating a natural uranium target with 13.5 MeV deuterons. The alpha energy and angular distributions are similar to those observed in spontaneous or thermal neutron induced fission. The correlation angle between alpha particles and light fission fragments has a most probable value of\(\bar \vartheta _{l f - \alpha } = 82.1^\circ \pm 0.9^\circ \) and a dispersion (FWHM) of Δϑ=18.4°±1.2°. The mean value and dispersion of the energy distribution are\(\bar {\rm E}_\alpha = 14.8 \pm 1.0 MeV\) and ΔE=9.1±1.2 MeV (FWHM), respectively. The peak-to-valley ratio of the ternary fission fragment mass distribution is found to increase with increasing alpha energy. For near-symmetric mass division, a strong broadening of the angular distribution is observed. The results are discussed in the frame of a multichannel-fission model.
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The authors would like to thank Mrs. J. Fiedler and Mrs. R. Förster for technical assistance and the cyclotron staff for providing stable beam conditions.
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Kotte, R., Fromm, W.D., Hentschel, E. et al. In-beam investigation of ternary fission. Z. Physik A - Atomic Nuclei 330, 189–195 (1988). https://doi.org/10.1007/BF01293395
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DOI: https://doi.org/10.1007/BF01293395