Quark Nuclear Physics with Polarized Photons in GeV Region

“夸克核物理GeV区极化光子夸克核物理”项目是以亚核结构研究为主题的。在这项研究中，我们将使用高能量，强，单色和偏振的γ光束通过康普顿背散射的激光光子。我们的目标是在8 GeV储存环（SPing8）上建造它。为了启动这一项目，我们对美国布鲁克海文国家实验室（Brookhaven National Laboratory，U. S. A.）和GRAAL（欧洲同步辐射设施，法国）。我们与这些设施中的人员讨论了在储存环上安装激光设备和光子标记系统的困难。杰斐逊实验室（TJNAF）进行了高能光核实验研究。一个大的接受光谱仪（CLAS）是准备为高能量范围。我们还讨论了Jefferson实验室提出的极化光子探测方案，认为高能极化光子探测的独特性将为研究核和亚核结构提供新的视角。利用偏振光子束作为电磁探针，为利用极化核和非极化核进行广泛的光核物理实验提供了可能。虽然我们已经开始准备的实验和建议的基础上，这项调查，进一步的讨论，研究必须继续。

The project of "Quark nuclear physics Quark Nuclear Physics with Polarized Photons in GeV Region" is subjected on the investigations of sub-nuclear structure. In this study, we will use high energy, intensive, monochromatic and polarized γ-beams by Compton-back scattering of laser photons. We aim to build it at the 8 GeV storage ring (SPing8). The broad range experiments of intermediate and high energy nuclear physics will be done at this facility.In order to start the project, we investigated the laser Compton-back scattering facilities as LEGS (Brookhaven National Laboratory, U. S. A. ) and GRAAL (European Synchrotron Radiation Facility, France). We discussed with people in these facilities on the difficulties of the installation of laser equipment on the storage ring and the photon tagging system. The investigation on high energy photo-nuclear experiments have been done at TJNAF (Jefferson Laboratory). A large acceptance spectrometer (CLAS) is preparing for the high energy range. We also discuss about the polarized photon proposals at Jefferson Laboratory.In this investigation, we could conclude that the uniqueness of high energy polarized photon probe will provide the new point of view on the nuclear and sub-nuclear structure. Usage of the polarized photon beam as an electromagnetic probe opens possibility to provide the wide range of the photonuclear physics experiments with polarized and unpolarized nuclei. Although we have began to prepare the experiments and proposals on the basis of this investigation, further discussions with researches must be continued.