Measurement of neutron capture cross sections of copper from 1 eV to 700 keV at CSNS Back-n.

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Abstract
The neutron capture cross sections of copper play a crucial role in the s process of stellar nucleosynthesis, the production of the medical isotope 64 Cu for PET imaging and radiotherapy, and Neutron Resonance Capture Analysis for determining the elemental and isotopic compositions of archaeological and cultural heritage materials. The Cu(n,γ) cross section was measured from 1 eV to 700 keV at the Back-n facility of the Chinese Spallation Neutron Source using the time-of-flight method. Prompt γ-rays were detected by four C 6 D 6 liquid scintillator detectors, and the data were analyzed using the pulse height weighting technique. The results are generally consistent with the evaluated data in the major library; however, some discrepancies were observed, offering valuable insights into the differences between five prominent evaluated data libraries. The R -matrix SAMMY code was used to extract the resonance parameters for 63,65 Cu in the resolved resonance region. Maxwellian-averaged cross sections were calculated within the temperature range relevant to the s process nucleosynthesis model, spanning kT =5-100 keV, based on the averaged cross sections in the unresolved resonance region. At kT =30 keV, the MACSs values for 63 Cu (88.1±8.8 mb) and 65 Cu (42.1±4.2 mb) were higher than the corresponding recommendations in the Karlsruhe Astrophysical Database of Nucleosynthesis in Stars.
Funding Information
  • National Natural Science Foundation of China (12035017)
  • National Natural Science Foundation of China (12475152)
  • National Natural Science Foundation of China (U1832182)
  • National Natural Science Foundation of China (U2032137)
  • Innovation Project of Guangxi Graduate Education (YCSW2024217)
  • Natural Science Foundation of Guangdong Province (2022A1515011184)

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