Microscopic Analysis of the alpha-DECAY in Heavy and Superheavy Nuclei

We analyze the alpha-decay along N-Z chains in heavy and superheavy nuclei. The a-particle preformation amplitude is estimated within the pairing model, while the penetration part by the deformed WKB approach. We show that for N > 126 the plateau condition is not fulfilled along any a-chain, namely the logarithmic derivative of the Coulomb function changes much faster in comparison with that of the preformation factor. We correct this deficiency by considering an a-cluster factor in the preformation amplitude, depending upon the Coulomb parameter. For superheavy region an additional dependence upon the number of interacting a-particles indicates a clustering feature connected with a larger radial component.