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HK: Fachverband Physik der Hadronen und Kerne

HK 52: Structure and Dynamics of Nuclei X

HK 52.1: Vortrag

Mittwoch, 13. März 2024, 17:30–17:45, HBR 19: C 5a

Absolute photon flux determination for nuclear resonance fluorescence experiments above the neutron separation threshold — •K. Prifti¹, 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. Cortes¹, 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, East Lansing, MI, USA — ⁷GSI, Darmstadt

The giant dipole resonance (GDR) is a fundamental nuclear excitation that dominates the dipole response of all nuclei. The present work aims at quantifying the branching ratio of the decay of the GDR of ¹⁵⁴Sm and ¹⁴⁰Ce, via emission of γ-rays or neutrons as a function of excitation energy. An activation measurement has been performed simultaneously to a nuclear resonance fluorescence (NRF) measurement in the energy range from 11.22 MeV to 17.5 MeV at the HIγS facility. Natural samples of Sm, Ce and Au were used as targets in the activation measurements. By determining their activation after irradiation and then comparing it to the GDR-NRF events that are observed, the γ- to neutron-decay branching ratio was determined.

Supported by the State of Hesse within Cluster project ELEMENTS and the LOEWE project, DFG Project-ID 499256822-GRK 2891 and U.S. DOE grant Nos DE-FG02-97ER41041 and DE-FG02-97ER41033.

Keywords: Photonuclear reactions; Giant Dipole Resonance; Photoactivation; Photoneutron cross sections; Decay branching ratios