Rajeswari, N S2017-04-012017-04-012014https://ir.avinuty.ac.in/handle/avu/2580Empirical relations for the preformation probability of cluster decay process in terms of the Q-value, mass aisymmetry (?;), mass number of the emitted cluster A2 is analyzed based on the discrepancy between the calculated and experimental half-lives of the cluster emitters. For the different empirical expressions considered corresponding to different physical quantities the preformation probability for the complete binary breakup of ^^®Ra is calculated and the obtained results are compared with the preformed cluster model calculation (Pq(PCM)) and another calculation in which the overlapping penetration probability is treated as the preformation probability (Po(/r)). Our empirical results for the use of Q-value compare well with Po(/r). Results due to the use of Q and its powers along with the combination of mass number A2 of the cluster emitted, and mass asymmetry rj, reveal that preformation factor depends strongly on Q-value rather than A 2 and r/. Calculated half-lives of different cluster decays for the use of emi)iiical Po values are found to be in good agreement with the experimental values.