Measurement of total fission gamma spectrum of 252Cf(s.f.)

IF 2.6 3区物理与天体物理 Q2 PHYSICS, NUCLEAR

The European Physical Journal A Pub Date : 2024-11-21 DOI:10.1140/epja/s10050-024-01439-8

Tomáš Czakoj, Michal Košťál, Evžen Losa, Stanislav Simakov, Evžen Novák, Martin Schulc, Zdeněk Matěj, Filip Mravec, František Cvachovec, Roberto Capote

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Abstract

The paper presents a first comprehensive measurement of the total fission gamma spectrum (TFGS) of ²⁵²Cf(s.f.) spanning an energy range from 0.2 to 14.3 MeV using stilbene scintillator spectroscopy. The measurement was performed with the ²⁵²Cf(s.f.) source placed in a flexo-rabbit ending, with a stilbene detector located at a distance of 100 cm from the source. The room effect was determined by separate measurement with a 50 cm long lead shielding cylinder placed between the source and the detector. The obtained spectrum was corrected for the effect of the ²⁵²Cf source structural parts and the flexo-rabbit ending, using correction function obtained by simulation with the MCNP6.2 code. The main benefit of this independent measurement is the wide energy range, from 0.2 up to 14.3 MeV, in a single experiment, whereas existing measurements typically cover narrower intervals. The knowledge of the TFGS is crucial for various applications involving ²⁵²Cf(s.f.) sources, including the design and analysis of nuclear systems, the validation of nuclear data, and the estimation of radiation in the nuclear medicine. The comparison of TFGS with the recently evaluated ²⁵²Cf(s.f.) prompt fission gamma spectrum (PFGS) indicates that delayed gammas may contribute above 2 MeV up to the highest energies; the current assumption was that delayed gammas contribution above 2 MeV was negligible.

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测量 252Cf（s.f.）的总裂变伽马能谱

本文介绍了首次使用石榴石闪烁体光谱法对 252Cf（s.f.）总裂变伽马能谱（TFGS）进行的全面测量，能量范围从 0.2 到 14.3 MeV。测量时，252Cf(s.f.)源被放置在一个挠性兔结束装置中，而闪烁体探测器则与源保持 100 厘米的距离。房间效应是通过在辐射源和探测器之间放置一个 50 厘米长的铅屏蔽圆筒进行单独测量来确定的。利用 MCNP6.2 代码模拟获得的校正函数，对获得的光谱进行了校正，以消除 252Cf 源结构部件和挠性兔结尾的影响。这次独立测量的主要优点是在一次实验中获得了从 0.2 到 14.3 MeV 的宽能量范围，而现有的测量通常覆盖较窄的区间。对于涉及 252Cf（s.f.）源的各种应用，包括核系统的设计和分析、核数据的验证以及核医学中的辐射估算，了解 TFGS 至关重要。TFGS 与最近评估的 252Cf(s.f.)瞬裂变伽马能谱（PFGS）的比较表明，延迟伽马在 2 MeV 以上直至最高能量都可能有贡献；目前的假设是，延迟伽马在 2 MeV 以上的贡献可以忽略不计。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

The European Physical Journal A 物理-物理：核物理

CiteScore

5.00

自引率

18.50%

发文量

216

审稿时长

3-8 weeks

期刊介绍： Hadron Physics Hadron Structure Hadron Spectroscopy Hadronic and Electroweak Interactions of Hadrons Nonperturbative Approaches to QCD Phenomenological Approaches to Hadron Physics Nuclear and Quark Matter Heavy-Ion Collisions Phase Diagram of the Strong Interaction Hard Probes Quark-Gluon Plasma and Hadronic Matter Relativistic Transport and Hydrodynamics Compact Stars Nuclear Physics Nuclear Structure and Reactions Few-Body Systems Radioactive Beams Electroweak Interactions Nuclear Astrophysics Article Categories Letters (Open Access) Regular Articles New Tools and Techniques Reviews.