Quark Nuclear Physics at Multi-GeV Accelerator

一个名为“SPring-8项目”的项目正在进行中，目的是利用后康普顿散射高能伽马射线在SPring-8设施发展核物理学。这个项目现在已经朝着它成功的目标有了一个良好的开端。1997年11月举行了一次国际用户小组会议，来自国外的几位杰出科学家参加了会议，其中包括印第安纳大学的约翰·卡梅伦教授。我们讨论了如何组织合作团队建设SPring-8的实验设施。在1998年秋季，BL33B2梁线的部分建设将完成。我们参观了几个用真实光子研究核物理的主要研究所。我们发现在SPring-8的夸克核物理得到了世界上许多科学家的强烈兴趣。在美国印第安纳大学回旋加速器实验室进行了非弹性质子散射实验，研究了原子核中的M1激发。实验很成功，数据正在分析中。另一项研究（p, p’）反应的实验已被提出，并在项目咨询委员会上得到批准。太阳中微子问题是当前有关中微子振荡的一个热点问题。发现^<176>Yb和^<160>Gd对太阳中微子的在线探测非常有用。我们利用“大雷电”光谱仪研究了450 MeV下的^<176>Yb和^<160>Gd（^3He, t）反应。电荷交换反应如（^3He, t）反应提供了天体物理学和粒子物理学的宝贵信息。研究原子核中的自旋激发是很重要的。这些研究是通过非弹性质子散射和核荧光实验进行的。后者在SPring-8中是可行的。

A Project called "SPring-8 Project" is in progress in order to develop Nuclear Physics at the SPring-8 facility using the back Compton scattered high-energy gamma rays. This project has now a good start toward its successful goal. In November 1997, a international users-group meeting was held with several distingushed scientists from abroad including Professor John Cameron of Indiana University. We discussed how to organize the cooperative teams to construct the experimental facilities in SPring-8. In the fall of 1998, a part of the construction of the BL33B2 beam line will be finished. We visited several major institites which investigate nuclear physics with real photons. We found that the quark nuclear physics at SPring-8 gets strong interest from many scientists in the world.An inelastic proton scattering experiment was performed at the cyclotron laboratory of Indiana University to study the M1 excitations in nuclei. The experiment was suceesful and the data is now in analysis. Another experiment to studiy the (p, p') reaction has benn proposed and it was approved in the Program Advisary Commettee.The solar neutrino problem is a current topics relating to the neutrino oscillation. Neuclei ^<176>Yb and ^<160>Gd were found to be very usefull for the on-line detection of the solar neutrinos. We studied the ^<176>Yb and ^<160>Gd(^3He, t) reactions at 450 MeV using the spectrometer "Grand Raiden". The charge-exchange reactions such as (^3He, t) reactions give precious informantion on astrophysics as well as on particle physics. Studies of spin excitations in nuclei is important. These studies are made via inelastic proton scattering and nuclear fluorecence experiments. The latter will be feasible in SPring-8.