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D(e.e'p)Coincidence Measurement at Threshold Region

阈值区域的 D(e.ep) 重合测量

基本信息

批准号：
07044055
负责人：
TAMAE Tadaaki
金额：
$ 4.03万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1995
资助国家：
日本
起止时间：
1995 至无数据
项目状态：
已结题

项目摘要

Coincidence measurements will be made for the d (e.e'p) reaction at low relative n-p energy and high four-momentum transfer. In the experiment, a liquid-deuterium target is irradiated with a high-energy continuous electron beam from the pulse-stretcher under construction at MIT-Bates laboratory. Cross sections will be measured as a function of proton angle in order to determine the non-interference o_Lo_T and interference o_<LT> cross sections.Study of the deuteron, the most simple nucleus which consists of one proton and one neutron. occupies a special position to understand nuclear structure and reactions. Recently, degrees of freedom beyond nucleons particularly draw the attension of physisits. The contribution of meson-exchange currents was clearly observed at the break-up threshold of the deuteron in single-arm electron scattering about 10 years ago. Coincidence experiments, however, have never been made in the region. Several calculations shows the sigma_<LT> interference cross section is sensitive to relativistic effects there.A pulse stretcher has been constructed in MIT-Bates laboratory. Our proposal has been accepted as one of experiments using continuous beams from the stretcher ring. The construction was completed at the end of the last year, and it is under commissioning now.Our experiment is made in the region where the cross section is small. It needs carefull preparation of equipments. we chose, therefore, an experiment at the quasi-elastic scattering region as the first experiment to contribute, that has been proposed by several gropes in USA.This experiment is capable with a pulsed beam available now. It uses a polarized electron beam, and an extra term can be obtained to extract a spetial term that depends on the spin of the electron. In the experiment, protons are detected out of the scatterig plane using four spectrometers in addition to a coincided electron. The experiment will be made in the spring of 1996.

在低相对n-p能量和高四动量转移条件下，将对d （e - e'p）反应进行符合性测量。在实验中，液体氘靶被来自麻省理工学院贝茨实验室正在建造的脉冲拉伸器的高能连续电子束照射。为了确定不干涉o_Lo_T和干涉o_<LT>的截面，将测量截面作为质子角的函数。氘核是由一个质子和一个中子组成的最简单的原子核。在理解核结构和核反应方面占有特殊地位。最近，核子以外的自由度特别引起了物理学家的注意。大约10年前，在单臂电子散射中，在氘核的分裂阈值处就清楚地观察到介子交换电流的贡献。然而，巧合实验从未在该地区进行过。一些计算表明，sigma_<LT>干涉截面对相对论效应很敏感。一个脉冲拉伸器已经在麻省理工学院贝茨实验室建成。我们的建议已被接受为使用从担架环连续梁的实验之一。该工程于去年年底完工，目前正在调试中。我们的实验是在截面小的区域进行的。这需要精心准备设备。因此，我们选择了在准弹性散射区域的实验作为第一个有贡献的实验，这个实验已经由美国的几个研究组提出。这个实验可以用现在可用的脉冲光束来完成。它使用极化电子束，并且可以获得一个额外的项来提取依赖于电子自旋的特殊项。在实验中，除了一个重合的电子外，还使用四台光谱仪在散射平面外检测到质子。这项试验将于1996年春季进行。