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Inelastic proton scattering experiments were performed at the Research Centerfor Nuclear Physics, Osaka, with a 295 MeV beam covering laboratory angles0{\deg}-6{\deg} and excitation energies 6-22 MeV. Cross sections due to E1 andM1 excitations were extracted with a multipole decomposition analysis and thenconverted to reduced transition probabilities with the "virtual photon method"for E1 and the "unit cross section method" for M1 excitations, respectively.Including a theory-aided correction for the high excitation energy region notcovered experimentally, the electric dipole polarizability was determined fromthe E1 strength distributions. Total photoabsorption cross sections derivedfrom the E1 and M1 strength distributions show significant differences comparedto those from previous ($\gamma$,xn) experiments in the energy region of theisocvector giant dipole resonance (IVGDR). The widths of the IVGDR deduced fromthe present data with a Lorentz parameterization show an approximately constantvalue of about 4.5 MeV in contrast to the large variations between isotopesobserved in previous work. The IVGDR centroid energies are in goodcorrespondence to expectations from systematics of their mass dependence.Furthermore, a study of the dependence of the IVGDR energies on bulk matterproperties is presented. The E1 strengths below neutron threshold show fairagreement with results from ($\gamma$,$\gamma$') experiments on112,116,120,124Sn in the energy region between 6 and 7 MeV. At higherexcitation energies large differences are observed pointing to a differentnature of the excited states with small ground state branching ratios. Theisovector spin-M1 strengths exhibit a broad distribution between 6 and 12 MeVin all studied nuclei.

Electric and magnetic dipole strength in 112,114,116,118,120,124Sn