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Two methods based on bremsstrahlung were applied to the stable even Moisotopes for the experimental determination of the photon strength functioncovering the high excitation energy range above 4 MeV with its increasing leveldensity. Photon scattering was used up to the neutron separation energies Snand data up to the maximum of the isovector giant resonance(GDR) were obtainedby photo-activation. After a proper correction for multi-step processes theobserved quasi-continuous spectra of scattered photons show a remarkably goodmatch to the photon strengths derived from nuclear photo effect data obtainedpreviously by neutron detection and corrected in absolute scale using the newactivation results. The combined data form an excellent basis to derive a shapedependence of the E1 strength in the even Mo isotopes with increasing deviationfrom the N = 50 neutron shell, i.e. with the impact of quadrupole deformationand triaxiality. The wide energy coverage of the data allows for a stringentassessment of the dipole sum-rule, and a test of a novel parameterizationdeveloped previously which is based upon. This parameterization for theelectric dipole strength function in nuclei with A>80 deviates significantlyfrom prescriptions generally used previously. In astrophysical networkcalculations it may help to quantify the role the p-process plays in the cosmicnucleosynthesis. It also has impact on the accurate analysis of neutron capturedata of importance for future nuclear energy systems and waste transmutation.

Experimental study of the electric dipole strength in the even Mo nuclei and its deformation dependence