Construction of polarized slow-positron beams using a compact cyclotron

T. Kumita; M. Chiba; R. Hamatsu; M. Hirose; T. Hirose; H. Iijima; M. Irako; N. Kawasaki; Y. Kurihara; T. Matsumoto; H. Nakabushi; T. Omori; Y. Takeuchi; M. Washio; J. Yang

doi:10.1016/S0169-4332(96)00964-6

Construction of polarized slow-positron beams using a compact cyclotron

T. Kumita, M. Chiba, R. Hamatsu, M. Hirose, T. Hirose, H. Iijima, M. Irako, N. Kawasaki, Y. Kurihara, T. Matsumoto, H. Nakabushi, T. Omori, Y. Takeuchi, M. Washio, J. Yang

Research output: Contribution to journal › Article

10 Citations (Scopus)

Abstract

We have constructed a polarized positron beam using positrons provided from the β ⁺ decay of ²⁷ Si with the half-life of 4.1 s and the maximum β ⁺ energy of 3.85 MeV. This isotope is produced via the ²⁷ Al(p, n) ²⁷ Si reaction caused by proton irradiation using a compact proton cyclotron. The intensity of this beam is measured to be 5 × 10 ⁵ e ⁺ /s for protons with the energy of 18 MeV and the current of 30 μA. A pair of Monte Carlo simulation programs has been developed to calculate depolarization of positrons in our beam channel. One program simulates spin motion of the positron under electric and magnetic fields, while the other simulates depolarization due to multiple Coulomb scattering in matter. Using these simulators, we designed a special polarimeter by means of magnetic quenching of ortho-positronium and measured a quenched lifetime of ortho-positronium under the magnetic field of 0.4, 2.5 and 4.0 kG leading to the average polarization of 33.4 ± 5.3%, which is consistent with the estimation based on the Monte Carlo simulations.

Original language	English
Pages (from-to)	1-6
Number of pages	6
Journal	Applied Surface Science
Volume	116
DOIs	https://doi.org/10.1016/S0169-4332(96)00964-6
Publication status	Published - 1997 May
Externally published	Yes

Keywords

Depolarization
Ortho-like positronium
Polarimeter
Polarized beam
Positron beam

ASJC Scopus subject areas

Chemistry(all)
Condensed Matter Physics
Physics and Astronomy(all)
Surfaces and Interfaces
Surfaces, Coatings and Films

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Kumita, T., Chiba, M., Hamatsu, R., Hirose, M., Hirose, T., Iijima, H., Irako, M., Kawasaki, N., Kurihara, Y., Matsumoto, T., Nakabushi, H., Omori, T., Takeuchi, Y., Washio, M., & Yang, J. (1997). Construction of polarized slow-positron beams using a compact cyclotron. Applied Surface Science, 116, 1-6. https://doi.org/10.1016/S0169-4332(96)00964-6

@article{622e01bc5eb44ee9ae14b1abad2e80d2,

title = "Construction of polarized slow-positron beams using a compact cyclotron",

abstract = " We have constructed a polarized positron beam using positrons provided from the β + decay of 27 Si with the half-life of 4.1 s and the maximum β + energy of 3.85 MeV. This isotope is produced via the 27 Al(p, n) 27 Si reaction caused by proton irradiation using a compact proton cyclotron. The intensity of this beam is measured to be 5 × 10 5 e + /s for protons with the energy of 18 MeV and the current of 30 μA. A pair of Monte Carlo simulation programs has been developed to calculate depolarization of positrons in our beam channel. One program simulates spin motion of the positron under electric and magnetic fields, while the other simulates depolarization due to multiple Coulomb scattering in matter. Using these simulators, we designed a special polarimeter by means of magnetic quenching of ortho-positronium and measured a quenched lifetime of ortho-positronium under the magnetic field of 0.4, 2.5 and 4.0 kG leading to the average polarization of 33.4 ± 5.3%, which is consistent with the estimation based on the Monte Carlo simulations. ",

keywords = "Depolarization, Ortho-like positronium, Polarimeter, Polarized beam, Positron beam",

author = "T. Kumita and M. Chiba and R. Hamatsu and M. Hirose and T. Hirose and H. Iijima and M. Irako and N. Kawasaki and Y. Kurihara and T. Matsumoto and H. Nakabushi and T. Omori and Y. Takeuchi and M. Washio and J. Yang",

year = "1997",

month = may,

doi = "10.1016/S0169-4332(96)00964-6",

language = "English",

volume = "116",

pages = "1--6",

journal = "Applied Surface Science",

issn = "0169-4332",

publisher = "Elsevier",

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TY - JOUR

T1 - Construction of polarized slow-positron beams using 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 - Kawasaki, N.

AU - Kurihara, Y.

AU - Matsumoto, T.

AU - Nakabushi, H.

AU - Omori, T.

AU - Takeuchi, Y.

AU - Washio, M.

AU - Yang, J.

PY - 1997/5

Y1 - 1997/5

N2 - We have constructed a polarized positron beam using positrons provided from the β + decay of 27 Si with the half-life of 4.1 s and the maximum β + energy of 3.85 MeV. This isotope is produced via the 27 Al(p, n) 27 Si reaction caused by proton irradiation using a compact proton cyclotron. The intensity of this beam is measured to be 5 × 10 5 e + /s for protons with the energy of 18 MeV and the current of 30 μA. A pair of Monte Carlo simulation programs has been developed to calculate depolarization of positrons in our beam channel. One program simulates spin motion of the positron under electric and magnetic fields, while the other simulates depolarization due to multiple Coulomb scattering in matter. Using these simulators, we designed a special polarimeter by means of magnetic quenching of ortho-positronium and measured a quenched lifetime of ortho-positronium under the magnetic field of 0.4, 2.5 and 4.0 kG leading to the average polarization of 33.4 ± 5.3%, which is consistent with the estimation based on the Monte Carlo simulations.

AB - We have constructed a polarized positron beam using positrons provided from the β + decay of 27 Si with the half-life of 4.1 s and the maximum β + energy of 3.85 MeV. This isotope is produced via the 27 Al(p, n) 27 Si reaction caused by proton irradiation using a compact proton cyclotron. The intensity of this beam is measured to be 5 × 10 5 e + /s for protons with the energy of 18 MeV and the current of 30 μA. A pair of Monte Carlo simulation programs has been developed to calculate depolarization of positrons in our beam channel. One program simulates spin motion of the positron under electric and magnetic fields, while the other simulates depolarization due to multiple Coulomb scattering in matter. Using these simulators, we designed a special polarimeter by means of magnetic quenching of ortho-positronium and measured a quenched lifetime of ortho-positronium under the magnetic field of 0.4, 2.5 and 4.0 kG leading to the average polarization of 33.4 ± 5.3%, which is consistent with the estimation based on the Monte Carlo simulations.

KW - Depolarization

KW - Ortho-like positronium

KW - Polarimeter

KW - Polarized beam

KW - Positron beam

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DO - 10.1016/S0169-4332(96)00964-6

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EP - 6

JO - Applied Surface Science

JF - Applied Surface Science

SN - 0169-4332

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