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Construction of a polarized positron generator at low energy

Research Project

Project/Area Number 06554004
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section試験
Research Field 素粒子・核・宇宙線
Research InstitutionTOKYO METROPOLTAN UNIVERSITY

Principal Investigator

HIROSE Tachishige  Tokyo Metropolitan Univ. Faculty of Science Professor, 理学部, 教授 (70087162)

Co-Investigator(Kenkyū-buntansha) NAKABUSHI Hiromitsu  Sumitomo Heavy Industry. Quantum Equipment Group Director, 量子機器事業部, 取締役
KUMITA Tetsuro  Tokyo Metropolitan Univ. Faculty of Science Research Associate, 理学部, 助手 (30271159)
IRAKO Mitsuhiro  Tokyo Metropolitan Univ. Faculty of Science Research Associate, 理学部, 助手 (60087004)
CHIBA Masami  Tokyo Metropolitan Univ. Faculty of Science Research Associate, 理学部, 助手 (60128577)
HAMATSU Ryosuke  Tokyo Metropolitan Univ. Faculty of Science Associate Professor, 理学部, 助教授 (20087092)
Project Period (FY) 1994 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥15,800,000 (Direct Cost: ¥15,800,000)
Fiscal Year 1996: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1995: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1994: ¥13,800,000 (Direct Cost: ¥13,800,000)
KeywordsPolorized positron / Zeeman effect / Spin rotation / Positronium / Depolarization / guenching / Annihilation delta-ray / ソレノイド磁場 / 磁場クエンチング
Research Abstract

Positrons emitted from beta-decay is longitudinally polarized and have a helicity of v / c where v and c are the velocity of the positron and light respectively. Furthermore if one utilizes a radio-isotope, one can hardly obtain positron beams with definite energy and sufficient intesitiy.
What we have achieved in this project is :
1. We developed the new method to produced polarized positrons by means of the nuclear reaction ^<27>Al (p, n) ^<27> Si where incident protons of 18 Me Vare produced by a compact cycrotron.
2. We established the reliable method to measure positron polarizations by utilizing the Zeeman effect.
3. We completed the Monte Carlo simulator which can describe positron depolarizations in electric and magnetic fields as well as in materials. These achivements have been lectured in the international conferences and symposiums.
On the basis of knowledges obtained in this research, we could construct the unique facility to provide high quality polarized positron beams i. e. TOPPS (TOkyo metropolitan university Polarized Positron beam System) which will enable us to perform various experimental studies concerning elementary particle physics, solid states physics and biological physics.

Report

(4 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • 1994 Annual Research Report
  • Research Products

    (20 results)

All Other

All Publications (20 results)

  • [Publications] T.Okugi et al.: "Proposed method to produce a highly polarized e^+ beam for future linear colliders" Jpn.J.Appl.Phys.35. 3677-3680 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Hirose: "Important role of polarized positron beam infuture linean colliders" Proc.of Internat.Workshop on physics and exp.748-752 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Matsumoto et al.: "Measurement of five photon annihilation of ortho-positronium" Phys.Rev.A54. 1947-1951 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Matsumoto et al.: "Four photon decay of ortho-positronium" Phys.Rev.A54. 1952-1957 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Kumita et al.: "Construction of polarized slow positron ninga compact cyclotron" To be published in Appl.Surface Science.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] J.Yang et al: "Study on spin precession of polarized slow positrons in solids" Jpn.J.Appl.Phys.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Okugi, M.Chiba, R.Hamatsu, T.Hirose, T.Kumuta et al.: "Proposed method to produce a highly polarized e+ beam for future linear colliders" Jpn. J.Appl. Phys.35. 3677-3680 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Hirose: "Impotant role of polarozed positron beam in future linear colliders" Proc. of Internat. Workshop on Physics and experiments with linear colliders (Morioka Iwate, 8-12 Sep.1995) ed. A.Miyamoto Y.Fujii. T.Matsui and S.Iwata, (World Science, Singapore 1996). 748-752

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Matsumoto, M.Chiba, R.Hamatsu, T.Hirose and J.Yu: "Measurement of five photon annihilation of ortho-positronium" Phys. Rev.A54. 1947-1951 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Matsumoto, M.Chiba, R.Hamatsu, T.Hirose and J.Yu: "Four-photon decay of orthopositronium : A test of charge conjugation invariance" Phys. Rev.A54. 1952-1957 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Kumita, M.Chiba, R.Hamatsu, T.Hirose, M.Irako et al.: "Construction of Polarized Slow-Positron Beams Using a Compact Cyclotron" To be published in Appl. Surface Science.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] J.Yang, M.Chiba, R.Hamatsu, T.Hirose M.Irako and T.Kumita: "Study on spin-precession of polarized slow positrons in solids" To be published in Jpn. J.Appl. Phys.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Okugi 他 9名: "Proposed method to produce a highly polarized e^+ beam for future linear collider" Jpn.J.Appl.phys.35. 3677-3680 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] T.Kumita 他 5名: "Construction of polarized slow-positron beams using a compact cyclotron" Appl.Surf.Sci. [to be published]. (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] J.Yang 他 5名: "Study on spin-precession of polarized slow positrons in solids" Jpn.J.Appl.phys. [to be published]. (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] T.Hirose: "Important role of Polarized positron beams for future linear colliders" Proceedings of Workshop on Physics and Experiments with linear Colliders at Iwate Japan on Sept.8-12,1995. (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] 広瀬立成: "偏極陽電子ビームの開発" 第2回 PF低速陽電子源研究会報告書. 47-64 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 広瀬立成: "スピン偏極陽電子ビームの構築と応用" 理研シンポジウム報告書. (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] T.Hirose,M.Chiba 他3名: "Prlcise Meaeurement of ete annihilation at rest into four photons and the search for exotic particles." Physical Review. 49. 3201-3208 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 広瀬立成: "質量の起源" 講談社, 274 (1994)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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