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Production of highly spin-polarized positron source

Kawasuso, Atsuo; Maekawa, Masaki; Fukaya, Yuki  ; Yabuuchi, Atsushi

We attempt to produce the $$^{68}$$Ge-$$^{68}$$Ga radioisotope as a highly spin-polarized positron source. We irradiated 20 MeV or 25 MeV proton beam for $$^{69}$$Ga targets. We confirmed the production of $$^{68}$$Ge-$$^{68}$$Ga radioisotopes by a nuclear reaction of $$^{69}$$Ga(p,2n)$$^{68}$$Ge. From the magnetic field dependence of two-$$gamma$$ self-annihilation intensity of positronium in a fused silica, we determined the spin polarization of emitted positrons to be more than 80% as theoretically predicted using the positron helicity.

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