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, Masakazu Washio, J. Yang

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

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
Volume255-257
Publication statusPublished - 1997
Externally publishedYes

Fingerprint

Cyclotrons
Positrons
cyclotrons
positrons
Polarization
polarization
Proton irradiation
proton irradiation
Zeeman effect
Depolarization
positronium
depolarization
Protons
Quenching
quenching
Magnetic fields
protons
magnetic fields
simulation
energy

Keywords

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

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Kumita, T., Chiba, M., Hamatsu, R., Hirose, M., Hirose, T., Iijima, H., ... Yang, J. (1997). Polarization measurement of a slow positron beam generated with a compact cyclotron. Materials Science Forum, 255-257, 656-658.

Polarization measurement of a slow positron beam generated with a compact cyclotron. / Kumita, T.; Chiba, M.; Hamatsu, R.; Hirose, M.; Hirose, T.; Iijima, H.; Irako, M.; Washio, Masakazu; Yang, J.

In: Materials Science Forum, Vol. 255-257, 1997, p. 656-658.

Research output: Contribution to journalArticle

Kumita, T, Chiba, M, Hamatsu, R, Hirose, M, Hirose, T, Iijima, H, Irako, M, Washio, M & Yang, J 1997, 'Polarization measurement of a slow positron beam generated with a compact cyclotron', Materials Science Forum, vol. 255-257, pp. 656-658.
Kumita T, Chiba M, Hamatsu R, Hirose M, Hirose T, Iijima H et al. Polarization measurement of a slow positron beam generated with a compact cyclotron. Materials Science Forum. 1997;255-257:656-658.
Kumita, T. ; Chiba, M. ; Hamatsu, R. ; Hirose, M. ; Hirose, T. ; Iijima, H. ; Irako, M. ; Washio, Masakazu ; Yang, J. / Polarization measurement of a slow positron beam generated with a compact cyclotron. In: Materials Science Forum. 1997 ; Vol. 255-257. pp. 656-658.
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T1 - Polarization measurement of a slow positron beam generated with a compact cyclotron

AU - Kumita, T.

AU - Chiba, M.

AU - Hamatsu, R.

AU - Hirose, M.

AU - Hirose, T.

AU - Iijima, H.

AU - Irako, M.

AU - Washio, Masakazu

AU - Yang, J.

PY - 1997

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AB - 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.

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