Accessing the Single-Particle Structure of the Pygmy Dipole Resonance in ${}^{208}$Pb

Abstract

New experimental data on the neutron single-particle character of the Pygmy Dipole Resonance (PDR) in ${}^{208}$Pb are presented. They were obtained from $(d,p)$ and resonant proton scattering experiments performed at the Q3D spectrograph of the Maier-Leibnitz Laboratory in Garching, Germany. The new data are compared to the large suite of complementary, experimental data available for ${}^{208}$Pb and establish $(d,p)$ as an additional, valuable, experimental probe to study the PDR and its collectivity. Besides the single-particle character of the states, different features of the strength distributions are discussed and compared to Large-Scale-Shell-Model (LSSM) and energy-density functional (EDF) plus Quasiparticle-Phonon Model (QPM) theoretical approaches to elucidate the microscopic structure of the PDR in ${}^{208}$Pb.

arXiv comment9 pages, 4 figures

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• Nuclear structure and direct reaction studies in particle-$\gamma$ coincidence experiments at the FSU John D. Fox Superconducting Linear Accelerator Laboratory
• A detailed view at magnetic dipole strengths: The case of semi-magic ${}^{50}$Ti