Polarization measurement of a slow positron beam generated with a compact cyclotron

T. Kumita*, M. Chiba, R. Hamatsu, M. Hirose, T. Hirose, H. Iijima, M. Irako, M. Washio, J. Yang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


We measured polarization of a slow positron beam produced in online-manner via the 27Al(p,n) 27Si reaction caused by proton irradiation. The intensity of this beam is measured to be 5105 e+/sec for protons with the energy of 18MeV and the current of 30mA. The polarization measurement makes use of the magnetic quenching of positronium due to Zeeman effect in a magnetic field of a several kG. The polarization of the beam is evaluated to be 38.44.0(statistical)5.8(systematic)%, which is consistent with the estimation based on our Monte Carlo simulations including depolarization processes in matter.

Original languageEnglish
Pages (from-to)656-658
Number of pages3
JournalMaterials Science Forum
Publication statusPublished - 1997
Externally publishedYes


  • Ortho-Like Positronium
  • Polarimeter
  • Polarized Beam
  • Positron Beam

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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