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HK: Fachverband Physik der Hadronen und Kerne
HK 7: Structure and Dynamics of Nuclei II
HK 7.2: Vortrag
Montag, 30. März 2020, 17:00–17:15, J-HS H
Test of photon strength functions for the well-deformed 164Dy — •O. Papst1, V. Werner1, 2, N. Pietralla1, T. Beck1, C. Bernards2, N. Cooper2, B.P. Crider3,4, U. Friman-Gayer1, J. Isaak1, J. Kleemann1, FNU Krishichayan5, B. Löher6, F. Naqvi2, 7, E.E. Peters3, F.M. Prados-Estevez3, R.S. Ilieva2,8, T.J. Ross3, D. Savran6, M. Scheck1,9, W. Tornow5, and J.R. Vanhoy10 — 1IKP, TU Darmstadt — 2WNSL, Yale U., New Haven, CT, USA — 3UKY, Lexington, KY, USA — 4MSU, East Lansing, MI, USA — 5Duke U. & TUNL, Durham, NC, USA — 6GSI, Darmstadt — 7U. Delhi, India — 8UNIS, Guildford, UK — 9UWS, Paisley & SUPA, Glasgow, UK — 10USNA, Annapolis, MD, USA
For heavy nulei, low-lying E1 strength referred to as Pygmy Dipole Resonance is often related to a semi-collective oscillation of a neutron skin. A sensitivity to the nucleus’ symmetry axes can be expected, resulting in a separation into two parts (K-splitting) for axially deformed nuclei. Data is sparse for such nuclei. In nuclear resonance fluorescence experiments performed at the High Intensity γ-ray Source (HIγS), the dipole strength of the deformed 164Dy was probed using a polarized, quasi-monochromatic γ-ray beam.
Above 4 MeV, a dominance of E1 strength is observed. Due to high level densities, only mean properties such as the average decay behavior are accessible above 5 MeV. The results are compared to experiments using complementary probes and statistical model simulations.
* Supported by the DFG under grant SFB1245 and by the State of Hesse under grant “Nuclear Photonics” within the LOEWE program.