Exotic cluster decay of very heavy nuclei is studied using the microscopicnuclear potentials obtained by folding density dependent M3Y effectiveinteraction with the densities of the cluster and the daughter nuclei. Themicroscopic nuclear potential, Coulomb interaction and the centrifugal barrierarising out of spin-parity conservation are used to obtain the potentialbetween the cluster and the daughter nuclei. Half life values are calculated inthe WKB framework and the preformation factors are extracted. The latter valuesare seen to have only a very weak dependence on the mass of the emittedcluster.
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