https://doi.org/10.1140/epja/s10050-022-00887-4
Regular Article - Experimental Physics
Measurement of the 
Eu(
) cross section up to 500 keV at the CSNS Back-n facility, and the stellar 
Eu() cross section at s-process temperatures
1
School of Nuclear Science and Technology, University of South China, 421001, Hengyang, China
2
School of Physics and Astronomy, Sun Yat-sen University, 519082, Zhuhai, China
3
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, 201800, Shanghai, China
4
State Key Laboratory of Lunar and Planetary Sciences, Macau University of Science and Technology, 999078, Macau, China
5
CNSA Macau Center for Space Exploration and Science, 999078, Macau, China
6
Institute of High Energy Physics, Chinese Academy of Sciences, 100049, Beijing, China
7
Spallation Neutron Source Science Center, 523803, Dongguan, China
8
Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-sen University, 519082, Zhuhai, China
9
University of Chinese Academy of Sciences, 100049, Beijing, China
10
Shanghai Advanced Research Institute, Chinese Academy of Sciences, 201210, Shanghai, China
11
Key Laboratory of Nuclear Data, China Institute of Atomic Energy, 102413, Beijing, China
12
College of Mathematics and Physics, Inner Mongolia Minzu University, 028000, Tongliao, China
13
Institute of Nuclear Physics, Inner Mongolia Minzu University, 028000, Tongliao, China
14
Shool of Materials Science and Engineering, Xiangtan University, 411100, Xiangtan, China
15
Key Laboratory of Nuclear Physics and Ion-beam Application (MOE),Institute of Modern Physics,Department of Nuclear Science and Technology, Fudan University, 200433, Shanghai, China
16
Institute of Particle and Nuclear Physics, Henan Normal University, 453007, Xinxiang, China
17
School of Physics, Henan Normal University, 453007, Xinxiang, China
18
Shenzhen Center, Cancer hospital, Chinese Academy of Medical Sciences, 518100, Shenzhen, China
19
Institute for Advanced Study in Nuclear Energy and Safety, College of Physics and Optoelectronic Engineering, Shenzhen University, 518060, Shenzhen, China
20
State Key Laboratory of Nuclear Physics and Technology and CAPT, Peking University, 100871, Beijing, China
21
Beijing Laser Acceleration Innovation Center Huairou, 101400, Beijing, China
Received:
30
July
2022
Accepted:
13
November
2022
Published online:
20
December
2022
In nuclear astrophysics, the nuclides 
Eu and 
Eu are both in the path of the s-process, and their (n, 
) cross sections are important input parameters for the calculation of the nuclear astrophysics network. According to the EXFOR database, the neutron capture cross section of natural europium in the resonance region has not been fully measured. The (n,) cross section of 
Eu was measured using the time-of-flight (TOF) technique at the Back-n white neutron source facility of the China Spallation Neutron Source (CSNS) in the 1 eV–to 500 keV range. Four C
D liquid scintillator detectors and pulse height weighting techniques were used to measure prompt rays and analyze the data. The results of the analysis were compared with the evaluated data of ENDF/B-VIII.0 and JENDL-5.0. It shows that there are some differences between the measurement results and different evaluated data libraries. The resonance parameters of Eu and Eu were extracted in the 1 eV–150 eV region using the R-Matrix code SAMMY. The accurate Maxwellian-averaged capture cross section (MACS) is derived over the temperature range of the s-process nucleosynthesis model. The result shows that at kT=30 keV, the MACS value of Eu is 3417 ± 297 mb and the value of Eu is 2718 ± 237 mb.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2022. 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.
