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Bonn 2020 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 6: Structure and Dynamics of Nuclei I

HK 6.1: Gruppenbericht

Montag, 30. März 2020, 16:30–17:00, J-HS E

Constraints on the symmetry energy from dipole excitations and neutron-removal cross-sections — •Andrea Horvat1,2, Thomas Aumann1,2, Konstanze Boretzky2, Ashton Falduto1,2, Dominic Rossi1,2, Heiko Scheit1, Dmytro Symochko1, Patrick van Beek1, and Lorenzo Zanetti1,21Technische Universität Darmstadt — 2GSI Helmholtzzentrum, Darmstadt

The understanding of the equation of state (EOS) of isospin-asymmetric nuclear matter around saturation density is of crucial importance for the description of exotic nuclei and astrophysical processes. The symmetry energy, describing the isospin-dependence of the EOS, is parametrized by its value at saturation (J) and the slope (L), with the latter quantity still poorly constrained. For this purpose, we aim to experimentally determine the values of selected observables exhibiting sensitivity to varying L in calculations within the scope of energy density functional theory. The newly upgraded R3B setup with the R3B-GLAD spectrometer and the NeuLAND neutron detector at GSI provide a unique opportunity to determine the Coulomb excitation and neutron-removal cross sections of heavy neutron-rich nuclei at energies between 400 and 1000 MeV/nucleon. The dipole response of stable nuclei will be investigated using monoenergetic (GACKO, NewSUBARU) and energy-tagged photons (NEPTUN, S-DALINAC) , complementing the approach with rare isotope beams.

Supported by BMBF via project No. 05P15RDFN1, GSI-TU Darmstadt cooperation agreement, DFG through grant No. SFB 1245, and HMWK through the LOEWE centre *Nuclear Photonics*.

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