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HK: Fachverband Physik der Hadronen und Kerne

HK 72: Poster

HK 72.4: Poster

Thursday, March 14, 2024, 17:15–18:45, HBR 14: Foyer

Study of the dipole response of ²⁴²Pu with nuclear resonance fluorescence — •M. Beuschlein¹, J. Birkhan¹, J. Kleemann¹, O. Papst¹, N. Pietralla¹, R. Schwengner², S. Weiß², V. Werner¹, U. Ahmed¹, T. Beck^1,3, I. Brandherm¹, A. Gupta¹, J. Hauf¹, K. E. Ide¹, P. Koseoglou¹, H. Mayr¹, C. M. Nickel¹, K. Prifti¹, M. Singer¹, T. Stetz¹, and R. Zidarova¹ — ¹IKP, TU Darmstadt, Germany — ²HZDR, Dresden, Germany — ³FRIB, East Lansing, MI, USA

Nuclear structure data of transuranium actinides play an important role in understanding the stellar nucleosynthesis. However, available information on photonuclear reactions is sparse. A first nuclear resonance fluorescence (NRF) experiment on the nucleus ²⁴²Pu was conducted under various safety precautions at the Darmstadt High-Intensity Photon Setup to probe its low-energy dipole response. The superconducting linear electron accelerator S-DALINAC at TU Darmstadt produced bremsstrahlung up to 3.7 MeV to irradiate a sample of PuO₂ with a total mass of about 1 g. Measured NRF γ rays reveal evidence for dipole-excited states with intrinsic projection quantum numbers K=0 and K=1. The latter indicates a potential fragment of the scissors mode, a collective low-energy M1 excitation of deformed nuclei. The isotope ²⁴²Pu is now the heaviest nuclide for which NRF information is available. Details of the experiment, γ-ray spectra, and preliminary results will be presented.

This work is supported by the LOEWE project ’Nukleare Photonik’ by the State of Hesse and by the DFG under grant No. GRK 2891.

Keywords: scissors mode; transuranium actinides; nuclear resonance fluorescence; dipole response