论文标题
在n_tof处的裂变横截面“绝对”测量的检测系统，在200 meV以下的能量范围内
A detector system for 'absolute' measurements of fission cross sections at n_TOF in the energy range below 200 MeV
论文作者
论文摘要
$^{235} $ u（n，f）横截面的新测量是在CERN的中子飞行时间N_TOF上进行的。该实验集中在中子能量从20 MeV到数百MeV上，并归一化为氢的中子散射。这是该设施的首先进行的测量，直到现在一直尚未经常探索，因此检测器开发阶段对其成功至关重要。提出了两个探测器，一个平行的板裂变室（PPFC）和一个后座质子望远镜（RPT），均致力于在入射中子能量范围内进行测量，从30 MeV到200 MeV。该实验旨在最大程度地减少分配的运行时间中的统计不确定性。做出了几项努力，以确保对系统的影响得到理解并受到控制。结果表明，检测器适用于在30 MEV以上的N_TOF上进行测量，并指示了可能的未来发展线的路径。
A new measurement of the $^{235}$U(n,f) cross section was performed at the neutron time-of-flight facility n_TOF at CERN. The experiment focused on neutron energies from 20 MeV to several hundred MeV, and was normalized to neutron scattering on hydrogen. This is a measurement first of its kind at this facility, in an energy range that was until now not often explored, so the detector development phase was crucial for its success. Two detectors are presented, a parallel plate fission chamber (PPFC) and a recoil proton telescope (RPT), both dedicated to perform measurements in the incident neutron energy range from 30 MeV to 200 MeV. The experiment was designed to minimize statistical uncertainties in the allocated run time. Several efforts were made to ensure that the systematic effects were understood and under control. The results show that the detectors are suited for measurements at n_TOF above 30 MeV, and indicate the path for possible future lines of development.
