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Mainz 2022 – scientific programme

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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-Gayer2,3, J. Isaak1, N. Pietralla1, V. Werner1, A. D. Ayangeakaa2,4, T. Beck1,5, M. L. Cortés1, S. W. Finch2,3, M. Fulghieri2,4, D. Gribble2,4, K. E. Ide1, X. James2,4, R. V. F. Janssens2,4, S. R. Johnson2,4, P. Koseoglou1, FNU Krishichayan2,3, O. Papst1, D. Savran6, N. Sensharma2,4, W. Tornow2,3, and A. Williams2,41IKP, 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.

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