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The odd-mass $^{117}$Sn nucleus was investigated in nuclear resonancefluorescence experiments up to an endpoint energy of the incident photonspectrum of 4.1 MeV at the bremsstrahlung facility of the Stuttgart University.More than 50 mainly hitherto unknown levels were found. From the measurement ofthe scattering cross sections model independent absolute electric dipoleexcitation strengths were extracted. The measured angular distributionssuggested the spins of 11 excited levels. Quasi-particle phonon modelcalculations including a complete configuration space were performed for thefirst time for a heavy odd-mass spherical nucleus. These calculations give aclear insight in the fragmentation and distribution of the $E1$, $M1$, and $E2$excitation strength in the low energy region. It is proven that the $1^{-}$component of the two-phonon $[2^{+}_{1} \otimes 3^{-}_{1}]$ quintuplet built ontop of the $1/2^{+}$ ground state is strongly fragmented. The theoreticalcalculations are consistent with the experimental data.Comment: 10 pages, 5 figure

physical review. c. nuclear physics/physical review. c, nuclear physics

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