| Vol. 53,
No. 3 September 1999 pp. 443-446 Distinction between pre-formed cluster emission and heavy ion decay by fission G SHANMUGAM and G M CARMEL VIGILA BAI Department of Physics, Manonmanian Sundaranar University, Tirunelveli 627 012, India Abstract. For studying cluster radioactivity in the actinide region as well as trans-tin region two types of models are used: the pre-cluster formation model and the unified fission model. In the case of the actinide region, the cluster-like shapes are preferred for very high asymmetry while fissioning shapes are more suitable for less asymmetry and symmetry (the line of demarcation being around A e = 31 ). In this work this line of demarcation is studied in the case of the trans-tin region. The results of this study show that the transition from cluster mode to fission mode takes place at A e = 16 . Keywords. Cluster radioactivity; pre-formed cluster emission; heavy ion decay by fission; compar-ison. PACS Nos 23.70+j; 23.60+e; 21.60.Gx |