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HK: Fachverband Physik der Hadronen und Kerne

HK 52: Poster

HK 52.16: Poster

Thursday, March 1, 2018, 16:30–18:45, Audimax Foyer

Dipole strength in ¹⁶⁴Dy below the neutron separation threshold * — •O. Papst¹, T. Beck¹, J. Beller¹, C. Bernards², M. Bhike³, N. Cooper², B. P. Crider^{4, 5, 6}, U. Gayer¹, J. Isaak^{1, 7}, J. Kleemann¹, FNU Krishichayan³, B. Löher¹, F. Naqvi², E. E. Peters⁴, N. Pietralla¹, F. M. Prados-Estevez⁴, P. C. Ries¹, R. S. Ilieva⁸, T. J. Ross⁴, D. Savran⁹, M. Scheck^{1, 10}, M. Schilling¹, W. Tornow³, J. R. Vanhoy^{4, 11}, V. Werner^{1, 2}, S. W. Yates⁴, and M. Zweidinger¹ — ¹IKP, TU Darmstadt — ²WNSL, Yale University, New Haven, CT, USA — ³TUNL, Duke University, Durham, NC, USA — ⁴UKY, Lexington, KY, USA — ⁵MSU, East Lansing, MI, USA — ⁶MSU, Starkville, MS, USA — ⁷RCNP, Osaka, Japan — ⁸UNIS, Guildford, UK — ⁹GSI, Darmstadt — ¹⁰UWS, Paisley, UK — ¹¹USNA, Annapolis, MD, USA

In several nuclei, on the low-energy tail of the giant dipole resonance, concentrated electric dipole strength has been observed that is commonly referred to as the pygmy dipole resonance. In the proposed picture of neutron skin oscillations, this resonance should be sensitive to the nucleus’ symmetry axes, separating into two parts for axially deformed nuclei. However, little data is available for such nuclei. In nuclear resonance fluorescence experiments conducted at the γ³ setup at the High Intensity γ-ray Source (HIγS) in Durham, NC, USA, the dipole strength above 4 MeV of the strongly deformed nucleus ¹⁶⁴Dy has been studied using a completely polarized, quasi-monochromatic γ-ray beam. Contributions to E1 and M1 strength are discussed.

* Supported by the DFG, Collaborative Research Center 1245.