Heidelberg 2015 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 25: Structure and Dynamics of Nuclei 5

HK 25.2: Talk

Tuesday, March 24, 2015, 15:00–15:15, T/HS2

Dipole polarizability of neutron rich nuclei and the symmetry energy — •Andrea Horvat¹, Thomas Aumann^1,2, Konstanze Boretzky², Jacob Johansen¹, Kenjiro Miki¹, Fabia Schindler¹, and Philipp Schrock¹ for the R3B collaboration — ¹IKP, TU Darmstadt, Germany — ²GSI, Darmstadt, Germany

As a part of a systematic investigation of the dipole response of stable up to very neutron rich tin isotopes, nuclear and electromagnetic excitation of ¹²⁴Sn - ¹³⁴Sn has been investigated at relativistic energies in inverse kinematics induced by carbon and lead targets at the LAND-R3B setup at GSI in Darmstadt. The electric dipole response and the nuclear reaction cross section, total and charge-changing, will be obtained from the kinematically complete determination of momenta of all particles on an event by event basis. The dipole polarizability will be extracted from the Coulomb excitation interaction channel, in order to make use of relevant correlations of this observable with nuclear matter properties such as the symmetry energy at saturation density (J) and it’s slope (L). The systematics of the low-lying "pygmy" dipole strength, the giant dipole resonance (GDR) and the neutron skin thickness will be determined with respect to increasing isospin asymmetry. This talk will also discuss the correlations and sensitivities of these variables and observables obtained within the framework of nuclear energy density functional theory.
This work is supported by HIC for FAIR, GSI-TU Darmstadt cooperation, NAVI and the BMBF project 05P12RDFN8.