Münster 2017 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 60: Structure and Dynamics of Nuclei IX

HK 60.1: Gruppenbericht

Freitag, 31. März 2017, 14:00–14:30, F 2

Studying the γ-decay behaviour of the Pygmy Dipole Resonance — •Simon G. Pickstone, Michelle Färber, Miriam Müscher, Sarah Prill, Mark Spieker, Michael Weinert, Julius Wilhelmy, and Andreas Zilges — Institute for Nuclear Physics, University of Cologne

Low-lying electric dipole strength, often denoted by Pygmy Dipole Resonance (PDR), is still not understood in detail. One important observable which could shed light on this is the γ-decay branching ratio to excited states. However, this observable is still only known for a few cases. The SONIC@HORUS setup in Cologne allows to measure branching ratios with high sensitivity. It consists of twelve silicon detectors for particle identification and ejectile-energy determination and the 14 HPGe detector array HORUS for high-resolution γ-ray spectroscopy. Using this setup, the particle-γ coincidence method is employed at the 10 MV FN tandem accelerator. Since the silicon detectors have a good energy resolution (70 keV in-beam) and a high solid-angle coverage (9%), a narrow gate on a specific decay and reaction channel gives a straightforward, state-to-state determination of branching ratios. Branching ratios for 1 states in 92,94Mo, 60Ni, and 120Sn will be presented. Combining these experiments with γ-decay studies from the γ3 setup at HIγS, it is possible to investigate the decay pattern of the PDR systematically and to gain more insight into the underlying structure of low-lying E1 strength.

Supported by DFG(ZI 510/7-1). S.P. and J.W. are supported by the Bonn-Cologne Graduate School of Physics and Astronomy.

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