Cluster emissions with 132Sn daughter from neutron-rich nuclei

Cluster emissions from neutron-rich 146Ba, 152Ce, 156Nd, 160Sm, and 164Gd nuclei are studied within the preformed cluster model of Malik and Gupta. Q-value estimates of the decays selected on the basis of shell effects in binding energies and their relative preformation probabilities show that these nuclei are stable (Q<0) against 4He and 10Be decays and all the metastable (Q>0) decays are of non-alpha-like heavy clusters. The most probable decays (minimum half-life times) are the ones with a doubly magic 132Sn nucleus as the daughter nucleus, arising due to the WKB penetrability. Compared to the presently measurable alpha-like cluster decays of the corresponding neutron-deficient parents into a 100Sn daughter nucleus, these decays are suppressed by many orders of magnitude. (author)