Hassan M T, Bateman F, Collett B, Darius G, DeAngelis C, Dewey M S, Jones G L, Komives A, Laptev A, Mendenhall M P, Nico J S, Noid G, Stephenson E J, Stern I, Trull C, Wietfeldt F E
Department of Physics and Engineering Physics, Tulane University, New Orleans, LA 70118, USA.
National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
Nucl Instrum Methods Phys Res A. 2017;867. doi: 10.1016/j.nima.2017.05.029.
Backscatter of electrons from a beta spectrometer, with incomplete energy deposition, can lead to undesirable effects in many types of experiments. We present and discuss the design and operation of a backscatter-suppressed beta spectrometer that was developed as part of a program to measure the electronantineutrino correlation coefficient in neutron beta decay (aCORN). An array of backscatter veto detectors surrounds a plastic scintillator beta energy detector. The spectrometer contains an axial magnetic field gradient, so electrons are efficiently admitted but have a low probability for escaping back through the entrance after backscattering. The design, construction, calibration, and performance of the spectrometer are discussed.
来自β谱仪的电子背散射，由于能量沉积不完全，会在许多类型的实验中导致不良影响。我们介绍并讨论了一种背散射抑制型β谱仪的设计与运行情况，该谱仪是作为测量中子β衰变中电子反中微子相关系数（aCORN）项目的一部分而开发的。一组背散射否决探测器环绕着一个塑料闪烁体β能量探测器。该谱仪包含一个轴向磁场梯度，因此电子能够有效地进入，但在背散射后从入口反向逃逸的概率很低。文中讨论了该谱仪的设计、构造、校准和性能。
