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Half life values for $\alpha$-decay in the mass region $A=150-200$ have beencalculated in the Microscopic Super Asymmetric Fission Model. The interactionbetween the $\alpha$-particle and the daughter nucleus has been obtained in thedouble folding model with the microscopic interaction DDM3Y1. Theoreticaldensities for the nuclei involved have been calculated in Relativistic MeanField approach with the Lagrangian density FSU Gold. Spectroscopic factors for$\alpha$-decay, calculated as the ratios of the theoretically calculated andexperimentally measured half life values, show a simple dependence on the massnumber and the product of the number of valence protons and neutrons. Theimplications of the parameterization have been discussed. Finally, based onthis simple relation, $\alpha$-decay half life values in a number of nucleihave been predicted.

Simple parametrization of $\alpha$-decay spectroscopic factor in $150\le A\le200$ region