https://doi.org/10.1140/epja/s10050-026-01828-1
Regular Article - Experimental Physics
New measurement of 
Lu(
, n) cross section at SLEGS and inference of neutron capture cross section for 
Lu
1
School of Nuclear Science and Technology, University of South China, 421001, Hengyang, China
2
Shanghai Advanced Research Institute, Chinese Academy of Sciences, 201210, Shanghai, China
3
Key Laboratory of Advanced Nuclear Energy Design and Safety, Ministry of Education, 421001, Hengyang, China
4
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, 201800, Shanghai, China
5
University of Chinese Academy of Science, 100049, Beijing, China
6
School of Physics, Henan Normal University, 453007, Xinxiang, China
7
Institute of Nuclear Science and Technology, Henan Academy of Sciences, 450015, Zhengzhou, China
8
Shanghai Tech University, 201210, Shanghai, China
9
School of Physics, Zhengzhou University, 450001, Zhengzhou, China
a
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b
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Received:
4
August
2025
Accepted:
26
February
2026
Published online:
25
March
2026
Abstract
The photoneutron cross sections of Lu were measured in the energy range of 7.90−13.89 MeV using a quasi-monochromatic, energy-tunable gamma-ray beam produced by the Shanghai Laser Electron Gamma Source (SLEGS) at the Shanghai Synchrotron Radiation Facility (SSRF). Neutron counts were detected by a newly developed neutron flat-efficiency detector (FED) array, and the -ray spectrum distribution from the SLEGS was precisely determined using a BGO detector with a 100% detection efficiency. The unfolded Lu(, n) data were obtained with an uncertainty of less than 5% using an unfolding iteration method, and were compared with the available experimental and TENDL-based evaluated data. The gamma-ray strength function (SF) values of Lu above the neutron threshold were extracted using the experimentally measured Lu(, n) data. Furthermore, an innovative Bayesian optimization framework was introduced to constrain the SF model parameters in the TALYS code, and the optimized SF model was then applied calculate the neutron capture cross section and Maxwell-averaged cross section of Lu.
Copyright comment Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
Communicated by Robert Janssens.
Zhi-Cai Li and Zi-Rui Hao are co-first authors.
© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2026
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
