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HK: Fachverband Physik der Hadronen und Kerne
HK 4: Structure and Dynamics of Nuclei I
HK 4.1: Gruppenbericht
Montag, 27. März 2017, 16:45–17:15, F 2
Measurements of total reaction cross sections in neutron-rich Sn isotopes at R3B - A method to constrain the EOS — •Fabia Schindler1,2, Thomas Aumann1,2, Konstanze Boretzky2, Andrea Horvat1,2, Philipp Schrock3, and Jacob Johansen4 for the R3B collaboration — 1TU Darmstadt — 2GSI Helmholtzzentrum — 3CNS, University of Tokyo — 4Aarhus University
Nuclei with a large neutron excess are expected to form a neutron-rich surface layer which is often referred to as the neutron skin. The investigation of this phenomenon is of great interest in nuclear-structure physics and offers a possibility to constrain the equation-of-state (EOS) of neutron-rich matter. Due to the short-range nature of the nuclear interaction, nuclear-induced reactions are a good tool to probe nuclear sizes. Measured reaction cross sections can be used to constrain the density distributions of protons and neutrons in the nucleus and therefore the neutron-skin thickness.
Total reaction, charge changing, and neutron-removal cross sections of neutron-rich tin isotopes in the mass range from A=124 to A=134 have been measured on carbon targets at the R3B setup at GSI in inverse kinematics and, for the first time, with very large acceptance and in a kinematically complete manner. The measurements are compared to calculations based on different energy-density functionals and the impact on the neutron-skin thickness and key parameters of the EOS will be discussed.
This work is supported by HIC for FAIR, NAVI, the GSI-TU Darmstadt cooperation, and the BMBF project 05P15RDFN1.