Abstract
In nuclear astrophysics, the nuclides \(^{151}\)Eu and \(^{153}\)Eu are both in the path of the s-process, and their (n, \(\gamma \)) 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,\(\gamma \)) cross section of \(^{nat}\)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\(_{6}\)D\(_{6}\) liquid scintillator detectors and pulse height weighting techniques were used to measure prompt \(\gamma \) 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 \(^{151}\)Eu and \(^{153}\)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 \(^{151}\)Eu is 3417 ± 297 mb and the value of \(^{153}\)Eu is 2718 ± 237 mb.
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Data Availability Statement
This manuscript has no associated data or the data will not be deposited. [Authors’ comment: First, the raw data we acquired in the experiment occupied too much data storage, amounting to 1 T. Second, the cross section data resulting from the data processing we will try to upload to the EXFOR database in the future.]
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Acknowledgements
We are grateful to the members of the CSNS Back-n Collaboration for enlightening discussions. This work is supported by the National Natural Science Foundation of China (Nos. U1832182, 11875328, 11761161001), the Natural Science Foundation of Guangdong Province, China (Nos. 18zxxt65, 2022A1515011184), the Science and Technology Development Fund, Macau SAR (File No. 008/2017/AFJ), the Macao Young Scholars Program of China (No. AM201907), China Postdoctoral Science Foundation (Nos. 2016LH0045, 2017M621573), and the Fundamental Research Funds for the Central Universities (Grant Nos. 22qntd3101, 2021qntd28).
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Li, X., An, Z., Jiang, W. et al. Measurement of the \(\varvec{^{nat}}\)Eu(\(\varvec{n,\gamma }\)) cross section up to 500 keV at the CSNS Back-n facility, and the stellar \(\varvec{^{151,153}}\)Eu(\(\varvec{n,\gamma }\)) cross section at s-process temperatures. Eur. Phys. J. A 58, 251 (2022). https://doi.org/10.1140/epja/s10050-022-00887-4
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DOI: https://doi.org/10.1140/epja/s10050-022-00887-4