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Alpha-decay half-lives for 104,105,106Te and 108,109,110Xe close above thedoubly-magic 100Sn are calculated from systematic double-folding potentials.The derived alpha preformation factors are compared to results for212,213,214Po and 216,217,218Rn above the doubly-magic 208Pb. Alpha-decayenergies of Q_alpha = 5.42 \pm 0.07 MeV and 4.65 \pm 0.15 MeV are predicted for104Te and 108Xe; the corresponding half-lives are T_{1/2} approx 5 ns for 104Teand of the order of 60 \mu s for 108Xe. Additionally, the properties ofrotational bands in 104Te are analyzed, and the first excited 2+ state in 104Teis predicted at E_x = 650 \pm 40 keV; it decays preferentially by gammaemission with a reduced transition strength of 10 Weisskopf units to the groundstate of 104Te and with a minor branch by alpha emission to the ground state of100Sn.Comment: 6 pages, 3 figures, to appear in Europ. Phys. J. A; two misprints in  Tables 1 and 3 correcte

Super-allowed α decay above doubly-magic 100Sn and properties of 104Te = 100Sn ⊗ α