Systematics of the electric dipole response in stable tin isotopes

¹ Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
² Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan

^* e-mail: sbassauer@ikp.tu-darmstadt.de

Published online: 16 May 2018

Abstract

The electric dipole is an important property of heavy nuclei. Precise information on the electric dipole response provides information on the electric dipole polarisability which in turn allows to extract important constraints on neutron-skin thickness in heavy nuclei and parameters of the symmetry energy. The tin isotope chain is particularly suited for a systematic study of the dependence of the electric dipole response on neutron excess as it provides a wide mass range of accessible isotopes with little change of the underlying structure. Recently an inelastic proton scattering experiment under forward angles including 0º on ^112,116,124Sn was performed at the Research Centre for Nuclear Physics (RCNP), Japan with a focus on the low-energy dipole strength and the polarisability. First results are presented here. Using data from an earlier proton scattering experiment on ¹²⁰Sn the gamma strength function and level density are determined for this nucleus.