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Quasi-one-dimensional superconductors or nanowires exhibit a transition intoa nonsuperconducting regime, as their diameter shrinks. We present measurementson ultrashort nanowires (~40-190 nm long) in the vicinity of this quantumtransition. Properties of all wires in the superconducting phase, even thoseclose to the transition, can be explained in terms of thermally activated phaseslips. The behavior of nanowires in the nonsuperconducting phase agrees withthe theories of the Coulomb blockade of coherent transport through mesoscopicnormal metal conductors. Thus it is concluded that the quantum transitionoccurs between two phases: a "true superconducting phase" and an "insulatingphase". No intermediate, "metallic" phase was found.Comment: 7 pages, 4 figures; published in Europhysics Letters; revised title,  text, and figures reflecting changes made during review proces

Dichotomy in short superconducting nanowires: Thermal phase slippage vs. Coulomb blockade