科研之友
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摘要
Background: For nuclei heavier than Pb-208 alpha decay is a dominating decay mode, and in the search of new superheavy elements one often observes chains of alpha decays. %26lt;br%26gt;Purpose: Explore and test microscopic descriptions of alpha decay based on theories with effective nuclear interactions. %26lt;br%26gt;Methods: The nuclear ground states are calculated with the Hartree-Fock-Bogoliubov (HFB) method using the Skyrme interaction. Microscopic alpha-decay formation amplitudes are calculated from the HFB wave functions, and the R-matrix formalism is utilized to obtain decay probabilities. %26lt;br%26gt;Results: Using a large harmonic-oscillator basis we obtain converged alpha-decay widths. A comparison with experiment including all spherical even-even alpha emitting nuclei shows that the model consistently predicts too small formation amplitudes while relative values are in good agreement with experiment. %26lt;br%26gt;Conclusions: The method was found to be numerically practical even with a large basis size. The comparison of formation amplitudes suggests that the pairing type correlations included in the HFB approach cannot produce sufficient a-particle clustering.
- 出版日期2013-12-13
