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Photon strength functions describing the average response of the nucleus toan electromagnetic probe are key input information in the theoretical modellingof nuclear reactions. Consequently they are important for a wide range offields such as nuclear structure, nuclear astrophysics, medical isotopeproduction, fission and fusion reactor technologies. They are also sources ofinformation for widely used reaction libraries such as the IAEA Reference InputParameter Library and evaluated data files such as EGAF.  In the past two decades, the amount of reaction gamma-ray data measured todetermine photon strength functions has grown rapidly. Different experimentaltechniques have led to discrepant results and users are faced with the dilemmawhich (if any) of the divergent data to adopt.  We report on a coordinated effort to compile and assess the existingexperimental data on photon strength functions from the giant dipole resonanceregion to energies below the neutron separation energy. The assessment of thediscrepant data at energies around or below the neutron separation energy hasbeen possible only in a few cases where adequate information on themodel-dependent analysis and estimation of uncertainties was available. In thegiant dipole resonance region, we adopt the recommendations of the new IAEAphotonuclear data library. We also present global empirical andsemi-microscopic models that describe the photon strength functions in theentire energy region and reproduce reasonably well most of the experimentaldata.  The compiled experimental photon strengths and recommended model calculationsare available from the PSF database hosted at the IAEA(URL:www-nds.iaea.org/PSFdatabase).

Reference Database for Photon Strength Functions