  $\alpha-$decay through a deformed potential barrier produces significant
mixing of angular momenta when mapped from the nuclear interior to the outside.
Using experimental branching ratios and either semi-classical or
coupled-channels transmission matrices, we have found that there is a set of
internal amplitudes which are essentially constant for all even--even actinide
nuclei. These same amplitudes also give good results for the known anisotropic
$\alpha-$particle emission of the favored decays of odd nuclei in the same mass
region.
  PACS numbers: 23.60.+e, 24.10.Eq, 27.90.+b
