Abstract
Deep subthreshold photofission data of238U are analysed. Spectroscopic properties of highly deformed states from experiments in the literature are introduced into a model calculation based on the doorway state formalism which is extended to fission at energies as low as the isomeric level. It is shown that starting from the results of a detailed analysis of the photofission measurements near the top of the fission barrier it is possible to describe the process in the energy range covered by the intermediate well in the double-humped deformation potential. In particular, the so-called “shelf effect” in the low energy photofission is reproduced in terms of delayed isomeric fission through a few undamped vibrational states localised in the pairing gap region above the isomer.
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Bellia, G., Del Zoppo, A., Maiolino, C. et al. Towards a better understanding of deep subthreshold photofission of238U. Z Physik A 314, 43–47 (1983). https://doi.org/10.1007/BF01411827
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DOI: https://doi.org/10.1007/BF01411827