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HK: Fachverband Physik der Hadronen und Kerne

HK 40: Structure and Dynamics of Nuclei VI

HK 40.5: Talk

Wednesday, March 30, 2022, 15:15–15:30, HK-H6

γ-decay Behavior of the Giant Dipole Resonances of ¹⁵⁴Sm and ¹⁴⁰Ce — •J. Kleemann¹, U. Friman-Gayer^2,3, J. Isaak¹, N. Pietralla¹, V. Werner¹, A. D. Ayangeakaa^2,4, T. Beck^1,5, M. L. Cortés¹, S. W. Finch^2,3, M. Fulghieri^2,4, D. Gribble^2,4, K. E. Ide¹, X. James^2,4, R. V. F. Janssens^2,4, S. R. Johnson^2,4, P. Koseoglou¹, FNU Krishichayan^2,3, O. Papst¹, D. Savran⁶, N. Sensharma^2,4, W. Tornow^2,3, and A. Williams^2,4 — ¹IKP, TU Darmstadt — ²TUNL, Durham, NC, USA — ³Duke University, Durham, NC, USA — ⁴UNC, Chapel Hill, NC, USA — ⁵FRIB, MSU, East Lansing, MI, USA — ⁶GSI, Darmstadt

The giant dipole resonance (GDR) is one of the most fundamental nuclear excitations and dominates the dipole response of all nuclei. Yet, its γ-decay behavior, despite being a key property, is still mostly unknown. Recently, novel data on the γ-decay of the GDR of the well-deformed nuclide ¹⁵⁴Sm and the spherical nuclide ¹⁴⁰Ce were obtained through photonuclear experiments at the HIγS facility. Individual regions of the GDR were selectively excited by HIγS’ intense, linearly-polarized and quasi-monochromatic γ-ray beam. This enables an excitation-energy resolved determination of the GDR’s γ-decay behavior. For ¹⁵⁴Sm in particular, the obtained data allow for a first experimental test of the commonly accepted K-quantum-number assignments to the double-humped GDR observed in deformed nuclei.

This work was supported by the State of Hesse under the grant Nuclear Photonics within the LOEWE program and within the Research Cluster ELEMENTS.