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In the model calculations of heavy element nucleosynthesis processes thenuclear reaction rates are taken from statistical model calculations whichutilize various nuclear input parameters. It is found that in the case ofreactions involving alpha particles the calculations bear a high uncertaintyowing to the largely unknown low energy alpha-nucleus optical potential.Experiments are typically restricted to higher energies and therefore no directastrophysical consequences can be drawn. In the present work a (p,alpha)reaction is used for the first time to study the alpha-nucleus opticalpotential. The measured 64Zn(p,alpha)61Cu cross section is uniquely sensitiveto the alpha-nucleus potential and the measurement covers the wholeastrophysically relevant energy range. By the comparison to model calculations,direct evidence is provided for the incorrectness of global optical potentialsused in astrophysical models.

Direct study of the alpha-nucleus optical potential at astrophysical energies using the 64Zn(p,alpha)61Cu reaction