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<p>Zirconium (Zr) and its alloys are critical materials in nuclear reactors because of their low neutron absorption cross section, high-temperature stability, and excellent corrosion resistance. The accuracy and reliability of nuclear data evaluated for Zr isotopes are directly related to the safety and efficiency of nuclear engineering. To provide experimental data for refining Zr nuclear data, we obtained the leakage neutron time-of-flight (TOF) spectra of natural Zr samples with three thicknesses at six angles using the D–T fusion neutron source in an integral experimental setup. The experimental results were compared with simulated TOF spectra generated using the Monte Carlo N-Particle Transport Code and nuclear data libraries, including CENDL-3.2, ENDF/B-VIII.0, JEFF-3.3, and JENDL-5. An analysis of the calculated-to-experimental ratios revealed the following: (1) The CENDL-3.2 library lightly underestimated elastic scattering at small angles but significantly overestimated it at larger angles and in discrete inelastic scattering ranges. (2) The ENDF/B-VIII.0 library significantly underestimated the discrete inelastic scattering ranges. (3) The JEFF-3.3 library consistently overestimated the measurements in both the elastic and discrete inelastic scattering ranges. (4) The JENDL-5 library demonstrated the best agreement with the experimental data among all libraries. These results highlight the inconsistencies in existing nuclear data for Zr isotopes and emphasize the necessity for further refinement to enhance their accuracy and reliability.</p>

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Shielding integral experiment of slab Zr samples based on a D–T neutron source

  • 期刊论文

  • 发表日期：

    2026年4月17日

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  • Xin-Yi Pan,
  • Yang-Bo Nie,
  • Shi-Yu Zhang,
  • Yan-Yan Ding,
  • Qi Zhao,
  • Kuo-Zhi Xu,
  • Xiao-Yu Wang,
  • Bei-Bo He,
  • Hong-Tao Cheng,
  • Xi-Chao Ruan,
  • Jie Ren

摘要

Zirconium (Zr) and its alloys are critical materials in nuclear reactors because of their low neutron absorption cross section, high-temperature stability, and excellent corrosion resistance. The accuracy and reliability of nuclear data evaluated for Zr isotopes are directly related to the safety and efficiency of nuclear engineering. To provide experimental data for refining Zr nuclear data, we obtained the leakage neutron time-of-flight (TOF) spectra of natural Zr samples with three thicknesses at six angles using the D–T fusion neutron source in an integral experimental setup. The experimental results were compared with simulated TOF spectra generated using the Monte Carlo N-Particle Transport Code and nuclear data libraries, including CENDL-3.2, ENDF/B-VIII.0, JEFF-3.3, and JENDL-5. An analysis of the calculated-to-experimental ratios revealed the following: (1) The CENDL-3.2 library lightly underestimated elastic scattering at small angles but significantly overestimated it at larger angles and in discrete inelastic scattering ranges. (2) The ENDF/B-VIII.0 library significantly underestimated the discrete inelastic scattering ranges. (3) The JEFF-3.3 library consistently overestimated the measurements in both the elastic and discrete inelastic scattering ranges. (4) The JENDL-5 library demonstrated the best agreement with the experimental data among all libraries. These results highlight the inconsistencies in existing nuclear data for Zr isotopes and emphasize the necessity for further refinement to enhance their accuracy and reliability.