Abstract
The superfluid tunneling model is applied to the calculation of ground-state--to--ground-state \ensuremath{\alpha} decay in the even-even neutron-deficient Te-Ba nuclei. We show that there is a larger \ensuremath{\alpha}-particle formation probability in nuclei of this region above $^{100}\mathrm{Sn}$ when compared to analogous nuclei above $^{208}\mathrm{Pb}$. This is consistent with the expected systematic variation of the pair gap $\mathrm{\ensuremath{\Delta}}$ as a function of mass number. The recent experimental data on the \ensuremath{\alpha} decay of the $N=Z$ nuclei $^{104}\mathrm{Te}$ and $^{108}\mathrm{Xe}$ are shown to leave open the possibility of enhanced \ensuremath{\alpha}-particle formation involving nucleon correlations beyond the standard treatment of like-nucleon pairing, which is the mechanism suggested as underlying ``superallowed'' \ensuremath{\alpha} decay.
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