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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. Beck^1,4, M. Beuschlein¹, S. W. Finch^5,6, U. Friman-Gayer^{1, 5,6}, E. Hoemann⁷, K. E. Ide¹, R. V. F. Janssens^6,8, N. Kelly⁹, J. Kleemann¹, FNU Krishichayan^5,6, D. R. Little^6,8, B. Löher², M. Müscher⁷, E. E. Peters¹⁰, P. C. Ries¹, M. Scheck⁹, J. Sinclair⁹, M. Spieker⁴, W. Tornow^5,6, S. W. Yates¹⁰, R. Zidarova¹, and A. Zilges⁷ — ¹IKP, 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)