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Development and Application of Spin-Polarized Positron Beam
Positrons emitted from radioisotopes are known to be longitudinally spin-polarized due to the parity non-conservation in the weak interaction. This property has been used for the study of positronium atoms. Polarized positrons are considered to be useful for the study of magnetic substances and spin-related phenomena, too. However, as compared to the conventional positron annihilation study on metals, semiconductors and polymers, there is only a limitted number of researches on magnetic substances using polarized positrons. To extract potential of polarized positrons, we newly develop spin-polarized positron beams by producing radioisotopes emitting highly polarized positrons. We apply the polarized positron beams for the study of magnetic substances and spin-related phenomena. We will demonstrate the advantages of polarized positron beam.
