  Alpha-decay half-lives for 104,105,106Te and 108,109,110Xe close above the
doubly-magic 100Sn are calculated from systematic double-folding potentials.
The derived alpha preformation factors are compared to results for
212,213,214Po and 216,217,218Rn above the doubly-magic 208Pb. Alpha-decay
energies of Q_alpha = 5.42 \pm 0.07 MeV and 4.65 \pm 0.15 MeV are predicted for
104Te and 108Xe; the corresponding half-lives are T_{1/2} approx 5 ns for 104Te
and of the order of 60 \mu s for 108Xe. Additionally, the properties of
rotational bands in 104Te are analyzed, and the first excited 2+ state in 104Te
is predicted at E_x = 650 \pm 40 keV; it decays preferentially by gamma
emission with a reduced transition strength of 10 Weisskopf units to the ground
state of 104Te and with a minor branch by alpha emission to the ground state of
100Sn.
