München 2019 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 42: Structure and Dynamics of Nuclei VIII
HK 42.5: Vortrag
Mittwoch, 20. März 2019, 17:45–18:00, HS 14
Study of dipole excitations in 124Sn via inelastic proton scattering @ 15 MeV — •M. Färber1, A. Bohn1, V. Everwyn1, M. Müscher1, S.G. Pickstone1, S. Prill1, P. Scholz1, M. Spieker2, M. Weinert1, J. Wilhelmy1, and A. Zilges1 — 1University of Cologne, Institute for Nuclear Physics, Germany — 2NSCL, Michigan State University, MI 48824, USA
The E1 strength distribution of a nucleus can be investigated via different excitation mechanisms. The tin isotopic chain is perfect for systematic studies, favoured by their magic proton number. Experiments on 124 Sn using (α,α’γ) [1], (γ,γ’) [2] as well as ( 17 O, 17 O’γ) [3] were already performed. The different excitation pattern observed in experiments with hadronic probes compared to electromagnetic probes might indicate a more isospin-mixed character of the Pygmy Dipole Resonance in contrast to the isovector character of the Giant Dipole Resonance [4]. To further investigate this phenomenon, a (p,p’γ) experiment at Ep=15 MeV was performed at the Cologne Tandem accelerator. The combined setup SONIC@HORUS was used, enabling a coincident measurement of the scattered protons and γ-rays. Apart from the excitation response, preliminary results on branching ratios will be presented. Supported by DFG(ZI 510/7-1). A.B. is supported by the Bonn-Cologne Graduate School of Physics and Astronomy.
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[2] K. Govaert et al., Phys. Rev. C 57, 2229 (1998).
[3] L. Pellegri et al., Phys. Lett. B 738, 519 (2014).
[4] D. Savran et al., Prog. Part. Nucl. Phys. 70, 210 (2013).