Microscopic studies on the demagnetization effect on permanent magnets induced by radiations from accelerators

为了研究加速器辐射（主要是中子）引起永磁体退磁的机理，测量了核反应堆和加速器产生的不同能量中子的退磁程度。用放射性核作探针，对辐射引起的磁体内部电磁结构的变化进行了微观研究。此外，还介绍了不稳定核探针和放射性束流技术的发展。

To investigate the mechanism on the demagnetization of permanent magnets caused by radiations (mainly neutrons) from accelerators, the degrees of demagnetization were measured for neutrons of various energies produced by a nuclear reactor and accelerators. The microscopic studies on the changes of electromagnetic structures inside the magnet caused by radiations are also performed by using radioactive nuclei as probes. Additionally, developments on the unstable nuclei as probes and the techniques on radioactive beam are performed.