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Spin-polarization of an electro-static positron beam

Authors
Journal
Applied Surface Science
0169-4332
Publisher
Elsevier
Publication Date
Volume
255
Issue
1
Identifiers
DOI: 10.1016/j.apsusc.2008.05.181
Keywords
  • Positron Beam
  • Spin-Polarization
  • Polarimeter

Abstract

Abstract We constructed an electro-static positron beam apparatus. We fabricated a simple spin-polarimeter composed of a permanent magnet with a surface magnetic field of 0.65 T and an iron pole piece. The longitudinal spin-polarization of the positron beam was determined to be 0.3 by analyzing the magnetic field dependence of the Doppler broadening of annihilation radiation from a fused silica specimen. The effect of spin rotation was examined using an iron poly-crystal and a simple E × B filter.

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