Akademik Veri Yönetim Sistemi
Brazilian Journal of Physics, cilt.56, sa.2, 2026 (SCI-Expanded, Scopus)
The preformation probability of the alpha-particle is a crucial factor in accurately describing decay half-lives, yet it is often treated with model-dependent assumptions and limited parameter constraints. This study aims to comprehensively investigate the alpha-particle preformation probabilities across a wide range of nuclei using a diverse set of microscopic interaction potentials, and to assess the model dependence and uncertainty associated with potential parameters. Using the Bohr–Sommerfeld quantization condition and the WKB approximation, we analyze 263 alpha-emitting nuclei from Te to Bh, employing 16 interaction potentials derived from the M3Y, DDM3Y, CDM3Y, and BDM3Y models. These double folding potentials incorporate both direct and exchange components, constructed using a Gaussian density for the alpha-particle and daughter nucleus densities obtained from the Hartree–Fock–Bogoliubov (HFB) calculations with the BSk2 Skyrme force. Preformation factors are extracted from experimental half-lives, and average values are determined for even–even, even–odd, odd–even, and odd–odd nuclei. The arithmetic average preformation probabilities across all interaction potentials are found to be,,, and. The theoretical alpha half-lives calculated using these average values are compared with experimental alpha half-lives, yielding the smallest rms deviations for the M3Y-Reid-ZR and M3Y-Paris-ZR models. The sensitivity of the inner turning point to the potential model and decay energy is also analyzed. Uncertainties due to the global quantum number G and Coulomb radius are taken into account. This work provides a statistically grounded evaluation of alpha preformation probabilities using a broad set of microscopic interaction potentials and highlights the crucial role of the inner turning point in determining alpha decay half-lives.