@article{oai:repo.qst.go.jp:00048056,
 author = {前川, 雅樹 and 和田, 健 and 宮下, 敦巳 and 河裾, 厚男 and 前川 雅樹 and 和田 健 and 宮下 敦巳 and 河裾 厚男},
 issue = {1},
 journal = {Journal of Physics: Conference Series},
 month = {Feb},
 note = {For the study of surface magnetic phenomena using the spin-polarized positron annihilation method, we developed a surface positronium (Ps) lifetime spectrometer. A spin-polarized slow positron beam is generated by a sodium-22 source and a solid Krypton moderator and transported to the sample chamber by electrostatic lenses. Incident energy is adjusted by a retarding potential using a deceleration tube. For the lifetime measurement, the start signal is obtained from a secondary-electron detector installed in front of the sample. The stop signal is detected by a scintillation detector for annihilation gamma ray. As the performance test, Ps lifetime measurements were carried out and clear decay curves derived from ortho-Ps self-annihilation were successfully observed. This system might be used for the estimation of the spin polarization at the surface of the ferromagnetic materials.},
 pages = {012009-1--012009-5},
 title = {Construction of a surface positronium lifetime spectroscopy apparatus with a spin-polarized low energy positron beam},
 volume = {791},
 year = {2017}
}