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HK: Fachverband Physik der Hadronen und Kerne

HK 20: Structure and Dynamics of Nuclei V

HK 20.5: Vortrag

Dienstag, 15. März 2016, 15:15–15:30, S1/01 A03

Pygmy-dipol resonance in nerutron-rich Sn-isotopes — •Joachim Tscheuschner and Thomas Aumann for the DALI-LaBr RIBF-Collaboration collaboration — TU Darmstadt, Darmstadt, Germany

To investigate the pygmy-dipole resonance (PDR) in the unstable Sn-128 and Sn-132 isotopes, an alpha-scattering experiment was performed at RIKEN, Japan. The photons of the excited states are measured with a high efficiency detector-array consisting of NaI crystals (DALI2) and in forward-directions large volume LaBr crystals (HECTOR). With alpha-scattering mainly the isoscalar modes are excited, through comparison with Coulomb-excitation it is possible to disentangle the isovector and the isoscalar part of the PDR. The aim of the experiments is to study the the development of the PDR as a function of the neutron-excess. In this contribution the experiments and first results of the ongoing analysis are presented. This project is supported by HIC for FAIR.