Darmstadt 2016 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 68: Structure and Dynamics of Nuclei XII
HK 68.3: Talk
Friday, March 18, 2016, 14:45–15:00, S1/01 A03
Selective excitation and γ-decay studies of the Pygmy Dipole Resonance in 120Sn with SONIC@HORUS — •Michael Weinert, Vera Derya, Andreas Hennig, Simon G. Pickstone, Mark Spieker, Julius Wilhelmy, and Andreas Zilges — Institute for Nuclear Physics, University of Cologne.
The excitation of states belonging to the Pygmy Dipole Resonance (PDR) in 120Sn was observed in a 119Sn(d,pγ) experiment, using the SONIC@HORUS setup at the 10 MV Tandem accelerator in Cologne. The setup, consisting of 6 ΔE-E silicon and 14 HPGe detectors, allows a selection of reaction, excitation, and deexcitation channels in an offline analysis, due to complete kinematics. Several excited states were identified as Jπ=1(−) states by comparison with results from a nuclear resonance fluorescence experiment [1], establishing the (d,p) reaction as an additional tool to study the PDR. Preliminary analysis shows that a γ-decay branching to the first 2+ state is observed and branching ratios can be determined. The contribution will present the experiment and principles of the data analysis needed to select transitions from Jπ=1− states. Furthermore, the latest status of the analysis will be presented, including branching ratios and branching-corrected B(E1) values, which will allow a more stringent comparison with recent inelastic proton scattering data [2].
Supported by DFG (ZI 510/7-1). S.G.P., M.S., and J.W. are supported by the Bonn-Cologne Graduate School of Physics and Astronomy.
[1] B. Özel et al., Phys. Rev. C 90 (2014) 024304
[2] A.M. Krumbholz et al., Phys. Lett. B 744 (2015) 7-12