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>Effects of nuclear collective vibrations on the alpha-decay fine structure of vibrational nuclei with A approximate to 220
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Effects of nuclear collective vibrations on the alpha-decay fine structure of vibrational nuclei with A approximate to 220
The multichannel cluster model (MCCM) is generalized to investigate the effect of nuclear collective vibrations on the alpha-decay fine structure. Vibrational excitations up to two-phonon states are taken into account and coupled-channels calculations are performed for vibrational Rn, Ra, Th, and U isotopes. Without introducing any additional adjustable parameter, the calculated alpha-decay branching ratios to various vibrational states show good agreement with the experimental data. In particular, it is shown that the alpha-decay fine structure is strongly correlated with vibrational excitations, offering an alternative tool to explore the phonon states in daughter nuclei. Despite the N = 126 shell closure, the calculated alpha-decay half-lives are also found to be in good agreement with the experimental data. A unified description of the alpha-decay fine structure has been achieved by the MCCM for both rotational and vibrational nuclei.
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