Bonn 2020 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 7: Structure and Dynamics of Nuclei II
HK 7.1: Group Report
Monday, March 30, 2020, 16:30–17:00, J-HS H
Investigation of the low-lying dipole response in photon-scattering experiments — •Miriam Müscher1, Johann Isaak2, Deniz Savran3, Ronald Schwengner4, Werner Tornow5, Julius Wilhelmy1, and Andreas Zilges1 — 1Institute for Nuclear Physics, University of Cologne — 2Institute for Nuclear Physics, TU Darmstadt — 3GSI, Darmstadt — 4Helmholtz-Zentrum Dresden-Rossendorf — 5Department of Physics, Duke University
The photoabsorption cross sections of atomic nuclei have great impact on reaction rates in nucleosynthesis processes. For instance, the occurrence of additional dipole strength below and around the particle separation threshold, often denoted by Pygmy Dipole Resonance [1], enhances the reaction rates in the rapid neutron-capture process [2].
Photon-scattering experiments are well-suited to selectively study dipole excited states [3]. Photoabsorption cross sections as well as spin and parity quantum numbers can be extracted in a model-independent way. Recent results of complementary (γ,γ′) experiments with "white" bremsstrahlung beams (at DHIPS [4] and γELBE [5]) and with quasi-monoenergetic photons (at HIγS [6]) will be presented.
This work is supported by the BMBF (05P18PKEN9).
[1] D. Savran et al., Prog. Part. Nucl. Phys. 70 (2013) 210
[2] S. Goriely, Phys. Lett. B 436 (1998) 10
[3] U. Kneissl et al., Prog. Part. Nucl. Phys. 37 (1996) 349
[4] K. Sonnabend et al., Nucl. Instr. and Meth. A 640 (2011) 6
[5] R. Schwengner et al., Nucl. Instr. and Meth. A 555 (2005) 211
[6] H.R. Weller et al., Prog. Part. Nucl. Phys. 62 (2009) 257