International Study of Ultra High-Energy Particle Beams

我们研究的目标是探讨国际合作建造高阻止率高强度次级光束的可能性，并有望尽早开始准备工作。对准这样的光束的强度约为10^lt；11；-12粒子/秒，大约是目前可用的光束的一万倍。特别是，我们主要感兴趣的是介子束。如果实现了世界上强度最高的这种束流，可以预期在带有Muon的粒子物理(罕见的Muon衰变和中微子振荡)、核物理和许多其他应用方面将取得重大进展。2000年5月，在美国蒙特利举办了“基于介子储存环的中微子工厂”研讨会。在研讨会上，我们做了许多贡献和重要的演讲，受到了观众的高度赞赏。由于取得了这样的成功，我们被接受于2001年5月在日本举办同一系列中的下一次研讨会。此外，2000年10月，在夏威夷大学举行了另一次重要的研讨会，主题是“轻子味破坏和中微子振荡的新倡议”，许多国外研究人员聚集在一起，讨论了关于高强度Muon源的各种问题。特别是我们日本团体正在推动的“棱镜”项目，其独特性和重要性得到了高度的认可。

The goal of our research is to examine the possibility of international collaboration on the construction of a high-intensity secondary beam with high stopping rates, and to hopefully start its preparation at the earliest time. The intensity aimed at such a beam is about 10^<11>-10^<12> particles/second, which is about ten thousand times the current beam available now. In particular, a muon beam is of our major interest. If that kind of a beam with the highest intensity in the world is achieved, significant progress in particle physics with muons (rare muon decays and neutrino oscillation), nuclear physics and many other applications can be expected. In May, 2000, the workshop on "Neutrino factories based on muon storage rings" were held in Monterey, US.In the workshop, we have given many contributions and important presentations, and they were accepted with high appreciation from the audiences. Owing to such success, we are accepted to hold the next workshop in the same series in Japan in May, 2001. Furthermore, in October, 2000, another important workshop on "New Initiatives of Lepton Flavor Violation and Neutrino Oscillation" was held in University of Hawaii, where many foreign researches gathered to discuss various issues on high-intensity muon source. In particular, the "PRISM" project which we Japanese group are pushing has received high acknowledgment on its uniqueness and significance of the project.