Darmstadt 2016 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 20: Structure and Dynamics of Nuclei V
HK 20.1: Gruppenbericht
Dienstag, 15. März 2016, 14:00–14:30, S1/01 A03
Studying the γ-decay behaviour of the Pygmy Dipole Resonance — •Simon G. Pickstone, Vera Derya, Andreas Hennig, Mark Spieker, Michael Weinert, Julius Wilhelmy, and Andreas Zilges — Institute for Nuclear Physics, University of Cologne
The Pygmy Dipole Resonance (PDR) has been studied extensively in the past decade [1,2]. However, one important property, the γ-decay branching ratio to excited states, is still not known systematically. To access this observable, the particle-γ coincidence method is used at the dedicated SONIC@HORUS setup. It consists of up to twelve silicon detectors for particle identification and ejectile energy determination and the 14 HPGe detector array HORUS for high-resolution γ-ray spectroscopy. Due to the good energy resolution of the silicon detectors, a narrow gate on a specific excitation energy can be set, which allows for a sensitive and straightforward state to state determination of branching ratios.
Branching ratios for 1− states in 92Mo and 94Mo from (p,p’γ) experiments and the decay pattern of 1− states in 120Sn from a (d,pγ) experiment will be shown, as well as possible theoretical interpretations. Together with γ-decay studies from the γ3 setup at HIγS, these experiments allow for a systematic study of the PDR decay pattern to better understand the underlying structure of low-lying E1 strength.
Supported by DFG(ZI 510/7-1). S.G.P., M.S., and J.W. are support-ed by the Bonn-Cologne Graduate School of Physics and Astronomy.
[1] D. Savran, T. Aumann, and A. Zilges, PPNP 70 (2013) 210
[2] A. Bracco, F.C.L. Crespi, and E.G. Lanza, EPJ A 52 (2015) 99