Cluster decays of the neutron-deficient Xe, Ba, Ce, Nd, Sm, and Gd parents are studied within the preformed cluster model of Malik and Gupta. The calculated preformation probabilities (Pa) and decay half-lives show that the a-nuclei (A2 --4n, Zq --N2) clusters, like Be, C, 0, Ne, Mg, and Si, emitted from N = Z parents are the most probable cases for measurements. Many of these clusters are shown to be within the upper limit of present experimental methods. This stresses the importance of 50 Sn-daughter in these decays.The fact that A2 --4n cluster decays are more probable than A2 --4n+2 clusters demonstrates that Sn radioactivity is associated with A2 --4n, Zq = N2 (o-nuclei) clusters. Structure effects of the nuclear (proximity) potential and binding energies (the shell effects) in GN plots and in variation of Po with the parent mass A are also pointed out.PACS number(s): 23.60.+e, 27.60. +j, 23.90.+w, 21.60.Gx
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