Results of the 244 Cm, 246 Cm and 248 Cm neutron-induced capture cross sections measurements at EAR1 and EAR2 of the n_TOF facility
Results of the 244 Cm, 246 Cm and 248 Cm neutron-induced capture cross sections measurements at EAR1 and EAR2 of the n_TOF facility
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n_TOF 设施 EAR1 和 EAR2 的 244 Cm、246 Cm 和 248 Cm 中子诱发俘获截面测量结果
DOI：
10.1051/epjconf/202328401009
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发表时间：
2023
影响因子：
--
通讯作者：
Alcayne V
中科院分区：
文献类型：
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作者：
Alcayne V
次锕系元素（MA）的准确中子俘获截面数据需要在轻水反应堆，第四代系统等临界快堆和加速器驱动系统（ADS）等其他创新反应堆系统中估计MA的产生和嬗变率。特别地，244 Cm、246 Cm和248 Cm在当前核反应堆的核废物的运输、储存和嬗变中起作用，这是由于这些同位素对乏核燃料中的放射性毒性、中子发射和衰变热的贡献。此外，这些Cm同位素的俘获反应为形成更重的元素开辟了道路。本文介绍了在CERN n_TOF装置上进行的~（244）Cm、~（246）Cm和~（248）Cm俘获截面的测量结果。值得注意的是，在n_TOF实验中使用的Cm样品以前曾在J-PARC的一个实验中使用过，这个实验和70年代的核爆炸实验是这些同位素的唯一捕获实验。在n_TOF条件下，用3个C6 D 6总能量探测器在20 m垂直飞行轨迹（EAR 2）上测量了244 Cm、246 Cm和248 Cm的俘获截面。此外，244 Cm的横截面测量在185米的飞行路径（EAR 1）与总吸收量热计（TAC）。EAR 1和EAR 2中的测量组合有助于控制和减少结果中的系统不确定性。本文介绍了不同测量方法的兼容性和获得结果的技术，以及获得共振参数的过程。
Accurate neutron capture cross section data for minor actinides (MAs) are required to estimate the production and transmutation rates of MAs in light water reactors, critical fast reactors like Gen-IV systems, and other innovative reactor systems such as accelerator driven systems (ADS). In particular,244Cm,246Cm and248Cm play a role in the transport, storage and transmutation of the nuclear waste of the current nuclear reactors, due to the contribution of these isotopes to the radiotoxicity, neutron emission, and decay heat in the spent nuclear fuel. Also, capture reactions in these Cm isotopes open the path for the formation of heavier elements. In this work, the results of the capture cross section measurement on244Cm,246Cm and248Cm performed at the CERN n_TOF facility are presented. It is important to notice that the Cm samples used in the experiment at n_TOF have been used previously in an experiment at J-PARC, this experiment and the previous one done in the 70s with a nuclear explosion were the only previous capture experiments for these isotopes. At n_TOF, the capture cross section measurements of244Cm,246Cm and248Cm were performed at the 20 m vertical flight path (EAR2) with three C6D6total energy detectors. In addition, the cross section of 244Cm was measured at the 185 m flight path (EAR1) with a Total Absorption Calorimeter (TAC). The combination of measurements in EAR1 and EAR2 has contributed to controlling and reducing the systematic uncertainties in the results. The compatibility of the different measurements performed and the techniques to obtain the results are presented in this paper as well as the procedure to obtain the resonance parameters.