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HK: Fachverband Physik der Hadronen und Kerne

HK 40: Structure and Dynamics of Nuclei VI

HK 40.3: Talk

Wednesday, March 30, 2022, 14:45–15:00, HK-H6

γ-decay of the Pygmy Dipole Resonance of 150Nd — •O. Papst1, J. Isaak1, N. Pietralla1, D. Savran2, V. Werner1, G. Battaglia3, T. Beck1,4, M. Beuschlein1, S. W. Finch5,6, U. Friman-Gayer1, 5,6, E. Hoemann7, K. E. Ide1, R. V. F. Janssens6,8, N. Kelly9, J. Kleemann1, FNU Krishichayan5,6, D. R. Little6,8, B. Löher2, M. Müscher7, E. E. Peters10, P. C. Ries1, M. Scheck9, J. Sinclair9, M. Spieker4, W. Tornow5,6, S. W. Yates10, R. Zidarova1, and A. Zilges71IKP, TU Darmstadt — 2GSI, Darmstadt — 3U. Strathclyde, Glasgow, UK — 4MSU, East Lansing, MI, USA — 5Duke U., Durham, NC, USA — 6TUNL, Durham, NC, USA — 7IKP, U. Köln — 8UNC, Chapel Hill, NC, USA — 9UWS, Paisley, UK — 10UKY, Lexington, KY, USA

The sensitivity of the Giant Dipole Resonance to axial nuclear deformation results in a separation into two parts (K-splitting). For heavy nuclei, low-lying E1 strength called Pygmy Dipole Resonance [1], often attributed to a semi-collective oscillation of a neutron skin, is expected to exhibit a similar sensitivity. Mean properties of the dipole strength of 150Nd were studied using a new high-resolution mode of the High Intensity γ-ray Source (HIγS) in photon scattering experiments with polarized γ-ray beams below separation thresholds. For the first time for a heavy deformed nucleus, different mean decay branches to the ground-state band could be resolved individually in the Pygmy-region.

* Supported by the State of Hesse under grant “Nuclear Photonics” within the LOEWE program.

[1] D. Savran et al., Prog. Part. Nucl. Phys. 70, 210 (2013)

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