D (e, e'p) Coincidence Experiment at Low Energy and High Momentum Transfer.

在这个实验中，在高动量转移时，质子的角分布被测量到了与氚的阈值附近的散射电子相符合。根据初步的理论计算，预计介子交换电流和相对论效应在本实验中是重要的。这项实验需要一个液重靶和一个可靠的探测系统。在麻省理工学院-贝茨实验室，通常使用圆形靶室。然而，由于质子通过圆靶的能量损失与反应点有关，质子能谱展宽为5 MeV，能量损失应与反应点无关，以满足实验所需的能量分辨率。为了保持靶中质子的路径长度不变，我们选择了一个重角靶室。与圆靶相反，再角室对材料的应力并不是不均匀的。这个房间里有…更需要仔细设计，因为氚是一种爆炸性物质。为了证明其可靠性和安全性，在美国马萨诸塞大学对日本建造的几个试验室进行了测试。在建造一个实际的试验室时，使用了测试数据。在这个实验中，用两个磁谱仪分析了散射电子和发射质子。质子的角度必须在目标处以优于20mR的分辨率进行测量。在光谱仪的作用力平面上，安装了探测器系统，由测量粒子位置和角度的垂直漂移室、产生定时信号的闪烁计数器、将电子与其他粒子分离的气凝胶切伦科夫计数器组成。系统的设计值达到了实验要求的性能指标。但由于可能存在考虑之外的误差，必须从实际实验中加以验证。因此，我们使用^3He(e，ed)实验的数据来评估修正和最终分辨率的影响。实验结果表明，最终结果满足实验要求。较少

Inthis experiment, the angular distributions of protons are measured in coincidence with the scattered electrons near the threshold of the deuteron at high momentum transfer. According to the preliminary theoretical calculations, it is expected that the meson exchange currents and the relativistic effects are important in this experiment. This experiment needs a liquid-deuterium target and a reliable detector system.At the MIT-Bates laboratory, a round target chamber is usually used. However, because the energy loss of the proton through the round target is dependent of the reaction point, the proton energy spectrum is spread by 5 MeV.The energy loss should be constant independent of the reaction point to satisfy the energy resolution the experiment demands. We have chosen a recutangular target chamber in order to keep the path length of the protons in the target constant. Contrary to the round target, the stress to materials is not unform for the recutangular chamber. The chamber have … More to be carefully designed because the deuterium is an explosive. Several trial chambers constructed in Japan were tested to prove its reliability and safety in University of Massachusetts in USA.The data of the test were used when a practical chamber was constructed.In this experiment, scattered electrons and emitted protons are analyzed with two magnetic spectrometers. The angle of the proton has to be measured with a resolution better than 20 mr at the target. In the forcal plane of the spectrometers, the detector system is installed, consisting of vertical drift chambers which measure the position and angle of the particles, scintillation counters which create timing signals, an Aerogel Cherenkov counter which separates electrons from other particles. The design values of the system satisfy the demanded performance for the experiment. However they have to be confirmed from the actual experiments, because there may exist errors out of consideration. We therefore evaluated the effects of the corrections and the final resolution using data of the ^3He (e, ed) experiment. It has been shown that the final results satisfy the performance our experiment demands. Less