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In this thesis, the author develops new high-power millimeter wave techniques for measuring the hyperfine structure of positronium (Ps-HFS) directly for the first time in the world.

In this thesis, the author develops new high-power millimeter-wave techniques for measuring the hyperfine structure of Positronium (Ps-HFS) directly for the first time. Indirect measurement of Ps-HFS reported in the literature might have systematic uncertainties related to the use of a static magnetic field. Development of the millimeter-wave devices supports the precise determination of Ps-HFS by directly measuring the Breit Wigner resonant transition from o-Ps to p-Ps without the magnetic field.At the same time, the width of the measured Breit-Wigner resonance directly provides the lifetime...

It is my great pleasure to publish New Frontiers in Lifestyle-Related Dis eases, the proceedings of the Showa University International Symposium for Life Sciences, 3rd Annual Meeting, held at Showa University on Sep tember 13, 2006. This symposium was supported, in part, by Grants for the Promotion of the Advancement of Education and Research in Graduate Schools and Ordinary Expenses for Private Schools from the Ministry of Education, Culture, Sports, Science, and Technology of Japan. On behalf of Showa University, I would like to express my deepest thanks to all the authors and editors for...