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

D (e, ep) 低能量和高动量传递的符合实验。

基本信息

批准号：
04640281
负责人：
TAMAE Tadaaki
金额：
$ 1.47万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

项目摘要

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

在这个实验中，测量质子的角分布与高动量转移时氘阈附近的散射电子相一致。根据初步的理论计算，我们认为介子交换流和相对论效应在实验中起着重要的作用。该实验需要液体氘靶和可靠的探测器系统，麻省理工学院贝茨实验室通常采用圆形靶室。然而，由于质子通过圆形靶的能量损失依赖于反应点，质子能谱扩展了5 MeV。能量损失应该是恒定的，与反应点无关，以满足实验要求的能量分辨率。我们选择了一个矩形靶室，以保持质子在靶中的路径长度恒定。与圆形靶不同，矩形靶对材料的应力分布不是均匀的。该商会有 ...更多信息因为氘是一种爆炸物。为了验证其可靠性和安全性，在美国马萨诸塞州大学对日本建造的几个试验室进行了试验，并将试验数据用于实际的试验室建造中，用两台磁谱仪对散射电子和发射质子进行了分析。测量质子的角度时，目标的分辨率必须优于20 mr。在光谱仪的forcal平面中，安装了检测器系统，包括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。系统的设计指标满足实验要求。但由于考虑到可能存在误差，因此必须从实际的实验中加以证实。因此，我们利用^3He（e，艾德）实验的数据来评估修正的效果和最终的分辨率。实验结果表明，该算法的性能满足实验要求。少