Quark Nuclear Physics with Polarized Photons in GeV Region

“GeV区具有偏振光子的夸克核物理”项目以亚核结构研究为主题。在这项研究中，我们将利用激光光子的康普顿-背散射来使用高能、密集、单色和极化的γ光束。我们的目标是在8 GeV的存储环（SPing8）上构建它。大范围的中高能核物理实验将在这里进行。为了启动该项目，我们研究了激光康普顿-背散射设施，如LEGS（美国布鲁克海文国家实验室）和GRAAL（法国欧洲同步辐射设施）。我们与这些设施的人员讨论了在存储环上安装激光设备和光子标记系统的难点。在杰弗逊实验室进行了高能光核实验的研究。大型接收谱仪（CLAS）正在为高能谱仪的研制做准备。我们还讨论了杰弗逊实验室的偏振光子方案。在本研究中，我们可以得出结论，高能偏振光子探针的唯一性将为研究核和亚核结构提供新的视角。利用极化光子束作为电磁探针，为利用极化和非极化原子核进行广泛的光子核物理实验提供了可能。虽然我们已经开始在调查的基础上准备实验和建议，但必须继续与研究人员进行进一步的讨论。

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.