EuNPC2015

The existence of long lived superheavy nuclei(SHN) is controlled mainly by spontaneous fission and alpha decay processes. The systematics of α-decay lifetimes formulated by Geiger and Nuttall empirically formed straight lines. The half-life is extremely sensitive to Qα. Almost all the theories use either the extrapolated values of Audi et al., or the measured KE to calculate the experimental Qαexp in the calculation of Tα. We proposed a corrected formula for Qα(cf~ln2) for the SHN which gives a very close agreement of the Qαexp. The earliest systematics of α-decay lifetimes of natural emitters from actinides region was obtained by plotting the experimental values of log10Tα vs Qα-1/2 and the data for a given Zd value fall roughly on a straight line with a large scatter between the lines. To reduce this separation, Zd is incorporated with the Qα and hence log10Tα vs Zd xQα-1/2 plot became a better plot for half-lives since the lines for different Zd values have a common slope. The universal straight line drawn by Silisteanu et al for 90 even-even SHN from Zd=100-118 (rms=0.1257) and from Zd=102-120 (rms=0.4187). Our modified Qα in the log10Tα (Viola-Seaborg) and (Brown) formula shows the rms value of 0.2252 and 0.0007 respectively. Hence the Brown Formula fit with our modified Qα may be the best fit for future studies of new alpha emitters in the superheavy region.