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HK: Fachverband Hadronen und Kerne
HK 82: Nuclear Structure and Dynamics I
HK 82.5: Talk
Friday, March 20, 2009, 12:15–12:30, H-ZO 40
Nuclear Resonance Fluorescence of 203,205Tl — •Fabian Pfeifer1, Mathias Fritzsche1, Norbert Pietralla1, Gencho Rusev2, Deniz Savran1, Anton P. Tonchev2, Werner Tornow2, Henry Weller1, Andreas Zilges3, and Markus Zweidinger1 — 1Institut für Kernphysik, Technische Universität Darmstadt, Germany — 2Triangle Universities Nuclear Laboratory, Duke University Durham, USA — 3Institut für Kernphysik, Universität zu Köln, Germany
In order to investigate the dipole strength distribution in Thalium isotopes we have studied Nuclear Resonance Fluorescence of a sample composed of natural Thalium (consisting of 30% 203Tl and 70% 205Tl). Unpolarized bremsstrahlung with photo energies up to 7.5 MeV was used at the High Intensity Photon Setup (HIPS) at S-DALINAC at the IKP Darmstadt. 24 fluorescent γ-ray transitions were observed, 19 of them for the first time. For the assignment of the polarity[1] of two prominent γ-ray transitions, one at 4.7 MeV and one at 4.9 MeV, the polarized photon beam of the High Intensity γ-ray Source (HIγS) at Duke University was used. The experiment at HIγS revealed the existence of a photo-excited state of 205Tl at an excitation energy of 4.971 MeV that exhibits a transition to the first excited state at 203 keV. The data will be presented and discussed
[1] N. Pietralla et al., Phys. Rev. Lett. 88, 012502 (2002)