Erlangen 2026 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 14: Structure and Dynamics of Nuclei IV

HK 14.2: Talk

Tuesday, March 17, 2026, 16:45–17:00, AM 00.021

Investigating the GDR of ¹⁶⁴Dy using NRF — •M. Heumüller¹, J. Kleemann¹, N. Pietralla¹, A. D. Ayangeakaa^2,3, S. W. Finch^2,4, D. Gribble^2,3, J. Hauf¹, J. Isaak¹, X. K.-H. James^2,3, R. V. F. Janssens^2,3, S. R. Johnson^2,3, T. Kowalewski^2,3, B. Löher⁵, O. Papst¹, K. Prifti¹, A. Saracino^2,3, D. Savran⁵, N. Sensharma^2,3, and V. Werner¹ — ¹IKP, TU Darmstadt — ²TUNL, Durham, NC, USA — ³U. of NC, Chapel Hill, USA — ⁴Duke U., Durham, USA — ⁵GSI, Darmstadt

The GDR’s geometrical model provides predictions for the γ-decay behavior in elastic photon and 2₁⁺ Raman scattering reactions. To rigorously test these for the first time, a photonuclear experiment was recently performed on the GDRs of the spherical and deformed nuclides ¹⁴⁰Ce and ¹⁵⁴Sm, respectively, at the High Intensity γ-ray Source (HIγS) at TUNL, USA [1]. HIγS’s quasi-monochromatic, polarized, and tunable photon beam was employed to selectively photoexcite energy slices of the GDR and subsequently measure their γ-decay. The results are in stunning agreement with the geometrical model predictions. A similar NRF experiment was conducted on the GDR of the strongly deformed ¹⁶⁴Dy at HIγS. ¹⁶⁴Dy is of particular interest due to its suspected higher degree of triaxiality. Experimental γ-ray spectra and the current status of the data analysis will be presented.

This work is supported by the DFG under Project-ID 499256822 – GRK 2891 ’Nuclear Photonics’ – and US DOE under No. DE-FG02-97ER41041 (UNC), No. DE-FG02-97ER41033 (TUNL).

[1]J. Kleemann et al., Phys. Rev. Lett. 134, 022503 (2025).

Keywords: Nuclear Resonance Fluorescence; Giant Dipole Resonance; Nuclear Photonics; Nuclear Structure