Bonn 2020 – wissenschaftliches Programm
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HK 26.1: Gruppenbericht
Mittwoch, 1. April 2020, 14:00–14:30, J-HS E
Systematics of the Electric Dipole Response in Stable Tin Isotopes* — •Sergej Bassauer1, Peter von Neumann-Cosel1, and Atsushi Tamii2 for the E422 collaboration — 1Institut für Kernphysik, TU Darmstadt, Darmstadt, Germany — 2RCNP, Osaka, Japan
The electric dipole response is an important property of heavy nuclei. Precise knowledge of the electric dipole response provides information on the dipole polarisability which in turn allows to extract important constraints on neutron-skin thickness in heavy nuclei and parameters of the symmetry energy. Another important property of nuclei which
can be extracted from the electric dipole response is the
gamma strength function (GSF). GSFs serve as input in calculations of cross sections in astrophysics, reactor design and waste transmutation within statistical models. Using the so called fluctuation analysis it is also possible to determine level densities in the GDR region. 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. An inelastic proton scattering experiment under forward angles on even-even 112−124Sn was performed with a focus on the low energy strength and polarisability. In this talk results on the dipole polarisability, gamma strength function and level density extracted from these data will be presented.
*Supported by the DFG through SFB 1245.