https://doi.org/10.1051/epjconf/202532901014
Systematic investigation of photon strength functions with monochromatic γ-ray beams
1 National Institute for Physics and Nuclear Engineering, Horia Hulubei (IFIN-HH), 30 Reactorului, 077125 Bucharest-Magurele, Romania
2 Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, 64289, Germany
3 Shanghai Advanced Research Institute, Chinese Academy of Sciences, No.99 Haike Road, Zhangjiang Hi-Tech Park, 201210 Pudong Shanghai, China
4 Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
5 Institute for Integrated Radiation and Nuclear Science, Kyoto University, 2-1010 Asashiro-nishi, Kumatori, Sennan, Osaka 590-0494, Japan
6 Konan University, Department of Physics, 8-9-1 Okamoto, Higashinada, Kobe 658-8501, Japan
7 Department of Physics, University of Oslo, N-0316 Oslo, Norway
8 Lomonosov Moscow State University, Faculty of Physics, 119991 Moscow, Russia
9 Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics, 119991 Moscow, Russia
10 Cyclotron Institute, Texas A*M University, College Station, Texas 77843, USA
11 Faculty of Physics, University of Bucharest, 405 Atomistilor Str., 077125 Bucharest-Magurele, Romania
12 Institut d’Astronomie et d’Astrophysique, Université Libre de Bruxelles, Campus de la Plaine CP 226, 1050 Brussels, Belgium
13 Laboratory of Advanced Science and Technology for Industry, University of Hyogo, 3-1-2 Kouto, Kamigori, Ako-gun, Hyogo 678-1205, Japan
* e-mail: ioana.gheorghe@nipne.ro
Published online: 25 June 2025
Following the main objective of the IAEA Coordinated Research Project on Photonuclear Data and Photon Strength Functions (Code F41032; Duration 2016-2019), new measurements of photoneutron and photofission cross sections in the Giant Dipole Resonance energy region have been performed at the laser Compton-scattering γ-ray source of the NewSUBARU synchrotron radiation facility. Nuclei in a wide mass range spanning from 9Be to 238U have been investigated. Quasi-monochromatic γ-ray beams with typical energy resolution 3% in full width at half maximum have been employed. The spectral distributions of the incident γ-ray beams have been modeled with the eliLaBr Monte Carlo simulation code for Compton interaction between continuous, unsynchronized laser and electron beams sent head-on against each other, with realistic modeling of the spatial overlap between the polarized laser and unpolarized electron beams along the interaction region and full modeling of the scattered photon polarization state. The neutron multiplicity sorting has been performed using an energy-dependent statistical treatment of neutron coincidence events associated with a flat-efficiency moderated neutron detection array. We report updates on the experimental technique and methodology and selected experimental results on total photoabsorption cross sections for 208Pb, 232Th and 238U.
© The Authors, published by EDP Sciences, 2025
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
