In this paper a short review of the theoretical problems of the pionic radioactivity asa new nuclear mode is presented. The essential theoretical and experimental results obtained in the25 years from the prediction of the nuclear pionic radioactivity are reviewed. Using the fission-likemodel it was shown that most of the SHE-nuclei lie in the region where the pionic fissility parametersattain their limiting value X π F = 1(Figs. 2-3). Hence, the SHE-region is characterized by the absenceof a classical barrier toward spontaneous pion emission. Consequently, both decay modes, the pionicfission and the spontaneous fission of SHE nuclides, essentially will be determined only by shelleffects. Then, it was seen that the usual predicted SHE-island of stability around the double magicnucleus 298-[114], which is not confirmed experimentally, can be explained by the dominant pionicradioactivity of the SHE-nuclei from this region. The bimodal symmetric (Figs. 5ab) as well as, thesupergiant radioactive halos (Fig. 6) as two important signature of the nuclear pionic fission areevidentiated.
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