SMuK 2023 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 60: Structure and Dynamics of Nuclei XII

HK 60.4: Vortrag

Donnerstag, 23. März 2023, 14:45–15:00, SCH/A215

γ-decay Behavior of the Giant Dipole Resonances of ¹⁵⁴Sm and ¹⁴⁰Ce — •J. Kleemann¹, U. Friman-Gayer^2,3,4, J. Isaak¹, N. Pietralla¹, V. Werner¹, A. D. Ayangeakaa^2,5, T. Beck^1,6, M. L. Cortés¹, S. W. Finch^2,3, M. Fulghieri^2,5, D. Gribble^2,5, K. E. Ide¹, X. James^2,5, R. V. F. Janssens^2,5, S. R. Johnson^2,5, P. Koseoglou¹, FNU Krishichayan^2,3, O. Papst¹, D. Savran⁷, and W. Tornow^2,3 — ¹IKP, TU Darmstadt — ²TUNL, Durham, NC, USA — ³Duke University, Durham, NC, USA — ⁴ESS, Lund, SE — ⁵UNC, Chapel Hill, NC, USA — ⁶FRIB, MSU, East Lansing, MI, USA — ⁷GSI, Darmstadt

The giant dipole resonance (GDR) is one of the most fundamental nuclear excitations and dominates the dipole response of all nuclei. 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. The regions were chosen to highlight distinct features of the double-humped GDR of ¹⁵⁴Sm. The obtained data allow for a first experimental test of the commonly accepted K-quantum-number assignments to the GDR of ¹⁵⁴Sm. First results of the analysis will be presented and discussed with respect to the textbook interpretation of the GDR in deformed nuclei.

This work is supported by the State of Hesse under the LOEWE research grant Nuclear Photonics and the cluster project ELEMENTS, and by the U.S. Department of Energy, Office of Nuclear Physics.