Scholarlink

<p>Accurate evaluation of the independent fission yields of mass chain A = 135 isobars is crucial for reactor kinetics, control, and fuel burnup calculations, as these nuclides contribute to the buildup of Xe-135, one of the most dominant neutron poisons in thermal reactors. Significant discrepancies are observed among the evaluated independent fission yields for A = 135 isobars in major nuclear data libraries, including ENDF/B-VIII.1, JEFF-3.3, and JENDL-5. This, in turn, highlights the continuing need for improved evaluation and validation of the A = 135 isobar family. In this study, the independent and cumulative fission yields of the A = 135 isobars, which contribute to the formation of Xe-135, were measured for thermal fission of U-235. This work was carried out within the framework of the Coordinated Research Project (CRP) entitled <i>“Updating Fission Yield Data for Applications”</i>, organized by the International Atomic Energy Agency (IAEA). The measurements were performed using gamma-ray spectrometry of the induced radioactivity in natural UO₂ samples following irradiation in a well-thermalized neutron flux position at the ETRR-2 research reactor. The experimental results were compared with evaluated data from the ENDF/B-VIII.1, JEFF-3.3, and JENDL-5 nuclear data libraries. In addition, the decay branching of I-135 to Xe-135m and Xe-135 was evaluated and discussed.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Measuring the fission yield of Xe-135 for applications

  • 期刊论文

  • 发表日期：

    2026年3月25日

查看全文
  • Nader M. A. Mohamed,
  • D. H. Daher

摘要

Accurate evaluation of the independent fission yields of mass chain A = 135 isobars is crucial for reactor kinetics, control, and fuel burnup calculations, as these nuclides contribute to the buildup of Xe-135, one of the most dominant neutron poisons in thermal reactors. Significant discrepancies are observed among the evaluated independent fission yields for A = 135 isobars in major nuclear data libraries, including ENDF/B-VIII.1, JEFF-3.3, and JENDL-5. This, in turn, highlights the continuing need for improved evaluation and validation of the A = 135 isobar family. In this study, the independent and cumulative fission yields of the A = 135 isobars, which contribute to the formation of Xe-135, were measured for thermal fission of U-235. This work was carried out within the framework of the Coordinated Research Project (CRP) entitled “Updating Fission Yield Data for Applications”, organized by the International Atomic Energy Agency (IAEA). The measurements were performed using gamma-ray spectrometry of the induced radioactivity in natural UO₂ samples following irradiation in a well-thermalized neutron flux position at the ETRR-2 research reactor. The experimental results were compared with evaluated data from the ENDF/B-VIII.1, JEFF-3.3, and JENDL-5 nuclear data libraries. In addition, the decay branching of I-135 to Xe-135m and Xe-135 was evaluated and discussed.