Abstract
The Sn-112,Sn-120(gamma, gamma `) reactions were studied for different
endpoint energies of the incident bremsstrahlung spectrum below the
neutron separation energies at the superconducting Darmstadt electron
linear accelerator S-DALINAC. Dipole transition strength distributions
have been extracted for Sn-112; the analysis of Sn-120 is Still in
progress. In the case of Sn-112 a concentration of dipole excitations is
observed between 5 and 8 MeV. Combining with existing data for
Sn-116,Sn-124 provides a systematics of the pygmy dipole resonance (PDR)
in stable Sn nuclei which serves as a benchmark test of recent
microscopic calculations aiming at a description of the PDR in exotic
neutron-rich Sn isotopes.
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