A segmented total energy detector (sTED) for (n, ?) cross section measurements at n_TOF EAR2
A segmented total energy detector (sTED) for (n, ?) cross section measurements at n_TOF EAR2
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用于在 n_TOF EAR2 处进行 (n, ?) 横截面测量的分段总能量探测器 (sTED)
DOI：
10.1051/epjconf/202328401043
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发表时间：
2023
影响因子：
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通讯作者：
Alcayne V
中科院分区：
文献类型：
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作者：
Alcayne V
中子飞行时间设施n_TOF的特点是其高瞬时中子强度、高分辨率和宽中子能谱，专为中子感生反应截面测量而设计。该设施有两个飞行时间（TOF）实验区：实验区1（EAR 1），位于距离Spartum目标185米水平飞行路径的末端，实验区2（EAR 2），位于垂直方向距离目标20米处。在相关的飞行时间窗口中，EAR 2的中子注量比EAR 1强300倍。EAR 2设计用于对低质量样品（约1 mg）进行具有挑战性的横截面测量，对小横截面或/和高放射性样品进行反应。EAR 2的高瞬时能量密度导致高计数率，这对现有的捕获系统提出了挑战。因此，sTED探测器的设计旨在减轻这些影响。2021年，完成了一项专门的活动，以验证探测器在至少300 keV中子能量下的性能。在此活动之后，探测器已用于在n_TOF EAR 2处执行各种捕获截面测量。
The neutron time-of-flight facility n_TOF is characterised by its high instantaneous neutron intensity, high-resolution and broad neutron energy spectra, specially conceived for neutron-induced reaction cross section measurements. Two Time-Of-Flight (TOF) experimental areas are available at the facility: experimental area 1 (EAR1), located at the end of the 185 m horizontal flight path from the spallation target, and experimental area 2 (EAR2), placed at 20 m from the target in the vertical direction. The neutron fluence in EAR2 is 300 times more intense than in EAR1 in the relevant time-of-flight window. EAR2 was designed to carry out challenging cross-section measurements with low mass samples (approximately 1 mg), reactions with small cross-sections or/and highly radioactive samples. The high instantaneous fluence of EAR2 results in high counting rates that challenge the existing capture systems. Therefore, the sTED detector has been designed to mitigate these effects. In 2021, a dedicated campaign was done validating the performance of the detector up to at least 300 keV neutron energy. After this campaign, the detector has been used to perform various capture cross section measurements at n_TOF EAR2.