Alpha radioactivity in heavy and super heavy elements

The alpha decay half lives and other characteristics of 190 even–even super heavy elements in the range 100⩽Z⩽120 has been determined within the Coulomb and Proximity Potential Model (CPPM). The computed Q values and log10(T1/2) values plotted against neutron number of parent nuclei were studied and it was found that neutron shell closures in the super heavy region occur at N=162 and N=184. The alpha decay half lives for parent nuclei with atomic number Z=106 onwards were compared with experimental data and are found to be in good agreement with each other. A semi-empirical formula for alpha decay half lives has been formulated by making least squares fit to the available experimental data. The new semi-empirical formula was used for calculating half lives of isotopes of nuclei in the chosen range 100⩽Z⩽120. These results when compared with the corresponding experimental half life values and the values calculated using GLDM and Viola–Seaborg systematics showed good agreement.