Experimental simulation of a stellar photon bath by bremsstrahlung: the   astrophysical $\gamma$-process
  The nucleosynthesis of heavy proton-rich nuclei in a stellar photon bath at temperatures of the astrophysical $\gamma$-process was investigated where the photon bath was simulated by the superposition of bremsstrahlung spectra with different endpoint energies. The method was applied to derive ($\gamma$,n) cross sections and reaction rates for several platinum isotopes. 
P.Mohr, K.Vogt, M.Babilon, J.Enders, T.Hartmann, C.Hutter, T.Rauscher,   S.Volz, A.Zilges