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Münster 2011 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 1: Hauptvorträge I

HK 1.1: Hauptvortrag

Montag, 21. März 2011, 11:45–12:15, HS1

Structure of the Pygmy Dipole Resonance — •Janis Endres — Institut für Kernphysik, Universität zu Köln

Atomic nuclei show collective phenomena like other strongly interacting many-body quantum systems. Especially giant resonances in atomic nuclei have been studied intensively in the last decades. Besides the well known isovector giant dipole resonance (IVGDR), an additional concentration of electric dipole strength is located energetically below the IVGDR, namely the pygmy dipole resonance (PDR). In recent years, the PDR has been investigated in great detail using different experimental techniques and various theoretical approaches. Besides systematic studies in nuclear resonance fluorescence experiments, α-scattering experiments at medium energies have been performed using the (α,α′γ) technique which revealed a splitting of the PDR [1,2]. In addition, the PDR could be observed in exotic nuclei using radioactive beams [3]. An overview of recent experimental results and theoretical calculations will be presented.
Supported by the DFG (ZI 510/4-1 and SFB 634), EURONS, and EMMI.

[1] D. Savran et al., Phys. Rev. Lett. 97 (2006) 172502.

[2] J. Endres et al., Phys. Rev. Lett. 105 (2010) 212503.

[3] P. Adrich et al., Phys. Rev. Lett. 95 (2005) 132501.

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