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Spin polarizations of positron beams generated using electrostatic and magnetic transportation systems with $$^{68}$$Ge and $$^{22}$$Na sources

静電場および磁場を用いて輸送する$$^{68}$$Geと$$^{22}$$Na線源を用いたスピン偏極陽電子ビーム発生

前川 雅樹; 深谷 有喜   ; Zhang, H.; Li, H.; 河裾 厚男

Maekawa, Masaki; Fukaya, Yuki; Zhang, H.; Li, H.; Kawasuso, Atsuo

Spin polarizations of electrostatic positron beams generated using a $$^{68}$$Ge and a $$^{22}$$Na sources with tungsten moderators were 47% and 30%, respectively. A comparable spin polarization (27%) was obtained with much reduced beam diameter (0.5 mm), when electromagnetic lenses, a $$^{22}$$Na source and a tungsten moderator were used. Replacing the tungsten moderator with a solid neon moderator in this system, the beam flux was significantly enhanced with maintaining the spin polarization. The Doppler broadening of annihilation radiation spectra of polycrystalline Fe measured using the above beams showed clear asymmetry upon field reversal.

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