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Background <p>High-precision measurement of the Prompt Fission Neutron Spectrum (PFNS) for highly radioactive nuclides constitutes a fundamental prerequisite for ensuring safe and efficient utilization of nuclear resources. However, the combination of strong background particles and the transient timescale characteristic of prompt fission events makes high-precision PFNS measurement exceptionally challenging.</p> Objective <p>To address this challenge, in this paper, a Parallel Plate Avalanche Counter (PPAC) prototype detector with superior fission fragment identification efficiency and rapid response time was fabricated for PFNS measurement.</p> Content <p>The identification ratio of alpha particles against background and the relative fission fragments identification efficiency were investigated using particle discrimination. Furthermore, the effects of key operational factors, including electrode spacing, gas pressure, and the electric field intensity, on PPAC detector performance were comprehensively studied through statistical analysis of amplitude and signal rise time spectra.</p> Results and Conclusion <p>The final results demonstrate that a single PPAC detection unit achieves an alpha particle identification ratio exceeds 1722, a signal rise time below 1.73 ns, and a relative identification efficiency of fission fragments exceeds 98.6%. An even more captivating prospect arising from our study suggests that the alpha particle identification ratio of the PPAC prototype detector could be substantially enhanced through coincident measurements using multiple PPAC detection units. The successful development of a PPAC detector with superior discrimination between background particles and fission fragments in this work heralds a breakthrough in enabling high-resolution PFNS analyses in intense radioactive backgrounds.</p>

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High-performance multiple parallel plate avalanche counter (PPAC) used for prompt fission neutron spectrum measurement: superior fission fragment identification and nanosecond-scale response

  • 期刊论文

  • 发表日期：

    2026年3月9日

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  • Mingzhi Zhang,
  • Cong Yu,
  • Hengwei Yang,
  • Xiao Jin,
  • Bin Tang

摘要

Background

High-precision measurement of the Prompt Fission Neutron Spectrum (PFNS) for highly radioactive nuclides constitutes a fundamental prerequisite for ensuring safe and efficient utilization of nuclear resources. However, the combination of strong background particles and the transient timescale characteristic of prompt fission events makes high-precision PFNS measurement exceptionally challenging.

Objective

To address this challenge, in this paper, a Parallel Plate Avalanche Counter (PPAC) prototype detector with superior fission fragment identification efficiency and rapid response time was fabricated for PFNS measurement.

Content

The identification ratio of alpha particles against background and the relative fission fragments identification efficiency were investigated using particle discrimination. Furthermore, the effects of key operational factors, including electrode spacing, gas pressure, and the electric field intensity, on PPAC detector performance were comprehensively studied through statistical analysis of amplitude and signal rise time spectra.

Results and Conclusion

The final results demonstrate that a single PPAC detection unit achieves an alpha particle identification ratio exceeds 1722, a signal rise time below 1.73 ns, and a relative identification efficiency of fission fragments exceeds 98.6%. An even more captivating prospect arising from our study suggests that the alpha particle identification ratio of the PPAC prototype detector could be substantially enhanced through coincident measurements using multiple PPAC detection units. The successful development of a PPAC detector with superior discrimination between background particles and fission fragments in this work heralds a breakthrough in enabling high-resolution PFNS analyses in intense radioactive backgrounds.