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HK: Fachverband Physik der Hadronen und Kerne

HK 52: Structure and Dynamics of Nuclei X

HK 52.3: Vortrag

Mittwoch, 13. März 2024, 18:00–18:15, HBR 19: C 5a

γ-decay Behavior of the Giant Dipole Resonances of ¹⁵⁴Sm and ¹⁴⁰Ce — •J. Kleemann¹, U. Friman-Gayer^2,3,4, J. Isaak¹, O. Papst¹, 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, 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. Geometrically it is pictured as an isovector oscillation of the proton against the neutron body. 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’s intense, linearly-polarized and quasi-monochromatic γ-ray beam. The obtained data allow for a novel close experimental assessment of the geometrical model of the GDR, in particular for ¹⁵⁴Sm with its double-humped GDR and respective K-quantum-number assignments.

Supported by the BMBF under grant No. 05P21RDEN9, by the DFG under GRK 2891, Project-ID 499256822 and the U.S. DOE under grant Nos. DE-FG02-97ER41041 and DE-FG02-97ER41033.

Keywords: Giant Dipole Resonance; Nuclear Deformation; Geometrical Model; Photonuclear Reactions; Nuclear Resonance Fluorescence