Münster 2017 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 60: Structure and Dynamics of Nuclei IX

HK 60.5: Vortrag

Freitag, 31. März 2017, 15:15–15:30, F 2

Pygmy Skin and Core Polarization Modes in Pb isotopes — •Nadia Tsoneva and Horst Lenske — Institut fur Theoretische Physik, Universität Gießen, Heinrich-Buff-Ring 16, D-35392 Gieβen, Germany

We have analysed theoretically recent high resolution measurements of the electromagnetic dipole response of 206Pb below the neutron separation energy which was performed at the HIγS facility of Duke University. The obtained experimentally spectral distributions and values for the total electric and magnetic dipole strength are compared to EDF+QPM calculations. The detailed theoretical study of the fragmentation pattern of low-energy electric dipole excitations allows for the first time to separate the pygmy dipole resonance from the tail of the giant dipole resonance and multi-phonon excitations showing striking difference of their decay patterns. Furthermore, based on the experiment and the comparison with EDF+QPM and relativistic RPA theories, the dipole polarizability αD=122.18±9.72 mb/MeV and the neutron skin thickness rskin= 0.151 fm in 206Pb are extracted. The newly obtained experimental and theoretical information is used to predict the Maxwellian-averaged cross section of the 205Pb(n,γ′)206Pb reaction at 30 keV. The astrophysical impact of different counterparts of the electric and magnetic dipole spectra related to the s-process of stellar nucleosynthesis is discussed.

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