NIFFTE裂变tpc中235U(n,f)/6Li(n,t) α反应事件的鉴定

M. Anastasiou
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引用次数: 0

摘要

虽然核数据在核物理应用中发挥着重要作用,但更好地理解数据并尽量减少不确定性已变得非常重要。特别是需要对可裂变核进行精确的中子诱导裂变截面测量。中子引起的裂变截面通常用比率来测量,在分母中有一个众所周知的标准。虽然235U(n,f)反应是一个很好的测量标准,但一些轻粒子反应也是众所周知的,它们作为参考可以提供信息,以消除仅锕系元素比中存在的共同系统不确定性。最近在洛斯阿拉莫斯中子科学中心使用NIFFTE合作的裂变时间投射室(fissionTPC)对235U(n,f)反应进行了测量,以标准的6Li(n,t)反应作为参考。该fissionTPC是2×2π带电粒子跟踪设计用于测量中子诱导裂变。对反应产物进行详细的三维轨迹重建,可以评估系统效应和相应的不确定度,这是其他测量技术无法直接获得的。本文主要对裂变tpc中6Li(n,t)α反应的事件识别进行了分析。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
6Li(n,t)α reaction event-identification for the 235U(n,f)/6Li(n,t) cross section ratio measurement in the NIFFTE fissionTPC
While nuclear data play an important role in nuclear physics applications, it has become important to have a better understanding of the data and try to minimize the uncertainties. In particular, there is a need for precision neutron-induced fission cross section measurements on fissile nuclei. Neutron-induced fission cross sections are typically measured as ratios, with a well-known standard in the denominator. While the 235U(n,f) reaction is a well measured standard, some light particle reactions are also well-known and their use as reference can provide information to remove shared systematic uncertainties that are present in an actinide-only ratio. A recent measurement of the 235U(n,f) reaction using as a reference the standard 6Li(n,t) reaction, was conducted at the Los Alamos Neutron Science Center using the NIFFTE collaboration’s fission time projection chamber (fissionTPC). The fissionTPC is a 2×2π charged particle tracker designed for measuring neutron-induced fission. Detailed 3D track reconstruction of the reaction products enables evaluation of systematic effects and corresponding uncertainties which are less directly accessible by other measurement techniques. This work focuses on the analysis for the event identification of the 6Li(n,t)α reaction in the fissionTPC.
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