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It is shown, that the Gamow-like model with only one adjustable parameter -radius constant is able to reproduce well the alpha-decay half-lives for alleven-even nuclei with the proton number larger than 50. The systematics forodd-A and odd-odd isotopes can be also well described when ones introduces anadditional hindrance factor. Similar model based on the W. J. Swiatecki ideafrom 1955 is developed to reproduce the spontaneous fission half-lives oftransactinide nuclei. The achieved accuracy of reproduction of the data isbetter than that obtained in more advanced theories.

On spontaneous fission and alpha-decay half-lives of atomic nuclei