Systematics of the pygmy dipole resonance in stable tin isotopes from resonant photon scattering

The 112,120Sn( γ , γ ′ ) 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 112Sn...

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Bibliographic Details
Published in:Nuclear physics. A 2007-05, Vol.788 (1), p.385-388
Main Authors: Özel, B., Enders, J., von Neumann-Cosel, P., Poltoratska, I., Richter, A., Savran, D., Volz, S., Zilges, A.
Format: Article
Language:English
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Summary:The 112,120Sn( γ , γ ′ ) 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 112Sn; the analysis of 120Sn is still in progress. In the case of 112Sn a concentration of dipole excitations is observed between 5 and 8 MeV . Combining with existing data for 116,124Sn 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.
ISSN:0375-9474
DOI:10.1016/j.nuclphysa.2007.01.069