Basic Science Research with High-Intensity Muon Beams

利用TRIUMF提供的高强度Muon束流，在基础Muon科学的实验研究中取得了以下成果：1)首次测量了LaSrCuO高T_c超导体氧位零场下的负Muon自旋纵向弛豫，并成功地探测到了(Mu^-O)位的顺磁电子与超导电流的相互作用。此外，还对该体系进行了理论团簇计算，阐明了(Mu^-O)位可能在顶氧附近的位置。2)通过测量Muon催化的DDMU聚变的3 MeV质子，研究了EV(DMU)与固体D_2层的相互作用。结果表明分子效应在DMU与d的弹性散射截面中的重要性。所有这些结果以及其他一些结果都是利用日本-加拿大超导Muon通道提供的世界上最好的DC Muon源实现的。

By using high intensity muon beam available at TRIUMF,the following achievements have been obtained in the experimental researches on basic muon science.1) Negative muon spin longitudinal relaxation under zero field at oxygen sites of LaSrCuO high T_c superconductors was measured for the first time.There, the interaction of paramagnetic electrons at (mu^-O) sites with supercurrents was successfully detected. Also, theoretical cluster calculations have been done for this system, clarifying the possible location of (mu^-O) sites being around the apical oxygen.2) The interaction of eV (dmu) with solid D_2 layr was studied by measuring 3 MeV protons from muon catalyzed ddmu fusion which occur only after slowing-down of (dmu). The results indicate importance of molecular effect in elastic scattering cross section of the (dmu) with d.All of these results plus some other were realized by utilizing the world-best dc muon sources available at Japan-Canada superconducting muon channel.