We present a new theoretical approach to evaluate $\alpha$-decay properties of deformed nuclei, namely the multichannel cluster model (MCCM). The deformed $\alpha$-nucleus potential is taken into full account, and the coupled-channel Schrödinger equation with outgoing wave boundary conditions is employed for quasibound states. Systematic calculations are carried out for well-deformed even-even nuclei with $Z⩾98$ and isospin dependence of nuclear potentials is included in the calculations. Fine structure observed in $\alpha$ decay is well described by the four-channel microscopic calculation, which is performed for the first time in $\alpha$-decay studies. The good agreement between experiment and theory is achieved for both total $\alpha$-decay half-lives and branching ratios to the ground-state rotational band of daughter nuclei. Predictions on the branching ratios to high-spin daughter states are presented for superheavy nuclei, which may be important to interpret future observations.

• Received 31 March 2010

DOI:https://doi.org/10.1103/PhysRevC.81.064318