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arXiv · 2009.01151

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

M. Spieker·A. Heusler·B. A. Brown·T. Faestermann·R. Hertenberger·G. Potel·M. Scheck·N. Tsoneva·M. Weinert·H. -F. Wirth·A. Zilges
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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.

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M. Spieker, A. Heusler, B. A. Brown, T. Faestermann, R. Hertenberger, G. Potel, M. Scheck, N. Tsoneva, M. Weinert, H. -F. Wirth, A. Zilges. 2020-09-02. Accessing the Single-Particle Structure of the Pygmy Dipole Resonance in $^{208}$Pb. https://doi.org/10.1103/physrevlett.125.102503

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