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We present an experimental study of thermally activated flux creep in asuperconducting ring-shaped epitaxial YBCO film as well as a new way ofanalyzing the experimental data. The measurements were made in a wide range oftemperatures between 10 and 83 K. The upper temperature limit was dictated byour experimental technique and at low temperatures we were limited by acrossover to quantum tunneling of vortices. It is shown that the experimentaldata can very well be described by assuming a simple thermally activatedhopping of vortices or vortex bundles over potential barriers, whereby thehopping flux objects remain the same for all currents and temperatures. The newprocedure of data analysis also allows to establish the current and temperaturedependencies of the flux-creep activation energy U, as well as the temperaturedependence of the critical current Ic, from the flux-creep rates measured atdifferent temperatures. The variation of the activation energy with current,U(I/Ic), is then used to reconstruct the profile of the potential barriers inreal space.Comment: 12 pages, 13 Postscript figures, Submitted to Physical Review

Critical currents, flux-creep activation energy, and potential barriers for the vortex motion from flux-creep experiments