Host: The organizing committee of JWPS2013
Name : 2nd Japan-China Joint Workshop on Positron Science (JWPS2013)
Location : Tsukuba, Japan
Date : December 20, 2013 - December 23, 2013
A spin-polarized positron beam generated using a 22Na source, solid neon moderator and magnetic lens was developed. The beam diameter, beam flux and spin polarization were 0.5 mm, 1 × 105 e+ s−1 and 27%, respectively. An electromagnet system, which can generate ±1 T magnetic field, was also developed and equipped with the beam apparatus. Using this apparatus, Doppler broadening of annihilation radiation spectra under a high magnetic field were measured for bulk polycrystalline Fe, Co, and Ni samples and a thin film Co2MnSi sample. These spectra showed a clear asymmetry upon field reversal.