München 2019 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 36: Structure and Dynamics of Nuclei VI

HK 36.3: Vortrag

Mittwoch, 20. März 2019, 14:45–15:00, HS 14

Dipole strength of ¹⁶⁴Dy below the neutron separation threshold — •O. Papst¹, V. Werner^{1, 2}, N. Pietralla¹, T. Beck¹, J. Beller¹, C. Bernards², M. Bhike^{3, 4}, N. Cooper^{2, 5}, B. P. Crider^{6, 7, 8}, U. Gayer¹, J. Isaak¹, J. Kleemann¹, FNU Krishichayan^{3, 4}, B. Löher¹, F. Naqvi^{2, 7}, E. E. Peters⁶, F. M. Prados-Estevez⁶, R. S. Ilieva⁹, T. J. Ross⁴, D. Savran¹⁰, M. Scheck^{1, 11, 12}, W. Tornow^{3, 4}, J. R. Vanhoy^{5, 13}, S. W. Yates⁵, and M. Zweidinger¹ — ¹IKP, TU Darmstadt — ²WNSL, Yale University, New Haven, CT, USA — ³TUNL, Durham, NC, USA — ⁴Duke University, Durham, NC, USA — ⁵UND, Notre Dame, IN, USA — ⁶UKY, Lexington, KY, USA — ⁷MSU, East Lansing, MI, USA — ⁸MSU, Starkville, MS, USA — ⁹UNIS, Guildford, UK — ¹⁰GSI, Darmstadt — ¹¹UWS, Paisley, UK — ¹²SUPA, Glasgow, UK — ¹³USNA, Annapolis, MD, USA

Low-lying E1 strength in heavy nuclei is frequently addressed as a Pygmy Dipole Resonance and associated to a semi-collective neutron-skin oscillation. It can be expected to be sensitive to the nucleus’ symmetry axes, separating into two parts for axially deformed nuclei (K-splitting). Data are sparse for such nuclei. In nuclear resonance fluorescence experiments conducted at the γ³ setup at the High Intensity γ-ray Source (HIγS), the dipole strength above 4 MeV of the deformed nucleus ¹⁶⁴Dy was studied using a polarized, quasi-monochromatic γ-ray beam, such that E1 and M1 strengths can be discussed. Resulting average quantities are compared to statistical model calculations.

* Supported by the DFG, Collaborative Research Center 1245.