Basic Science Research with High-Intensity Muon Beams

利用TRIUMF高强度μ子束，在基础μ子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μ子自旋纵向弛豫，成功地探测到（μ ^-O）位顺磁电子与超导电流的相互作用。2）通过测量μ子催化ddmu聚变产生的3 MeV质子，研究了eV（dmu）与固体D_2层的相互作用。结果表明，分子效应的重要性（dmu）与d.所有这些结果加上一些其他的弹性散射截面实现了利用世界上最好的直流μ子源在日本-加拿大超导μ子通道。

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.