Alpha-decay Half-lives and Fission Barriers for Superheavy Nuclei Predicted by a Nuclear Mass Formula

概要

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We estimate &alpha;-decay half-lives from Q&alpha; values with phenomenological formulas. The parameter values of the formulas are adjusted by using experimental half-lives and Q values of the Evaluated Nuclear Structure Data File (ENSDF) for a wide nuclidic region. The half-lives T&alpha; for unknown nuclei are estimated by this phenomenological formula with the use of Q&alpha; values taken from KUTY mass formula. In addition to the half-lives, we estimate spontaneous fission barriers calculated by the method to obtain the shell energies of KUTY formula. In the superheavy region, the barrier heights of the nuclei near the nucleus 304 122 are about 8 MeV and their widths are fairly wide. Therefore these spontaneous-fission half-lives are expected to be very long. On the other hand, there are some neutron-deficient nuclei whose spontaneous-fission half-lives expected to be rather short because their fission barrier heights are small and the widths of them are narrow.
日本放射化学会の論文
2002-06-01