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We have fabricated and measured superconducting single-electron transistorswith Al leads and Nb islands. At bias voltages below the gap of Nb we observeclear signatures of resonant tunneling of Cooper pairs, and of Coulomb blockadeof the subgap currents due to linewidth broadening of the energy levels in thesuperconducting density of states of Nb. The experimental results are in goodagreement with numerical simulations.Comment: 4 pages, 3 figure

Cooper-pair resonances and subgap Coulomb blockade in a superconducting single-electron transistor