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中性子共鳴反応における時間、空間反転非保存の研究

Research Project

Project/Area Number 04244101
Research Category

Grant-in-Aid for Scientific Research on Priority Areas

Allocation TypeSingle-year Grants
Research InstitutionKyoto University

Principal Investigator

政池 明  京都大学, 大学院・理学研究科, 教授 (40022587)

Co-Investigator(Kenkyū-buntansha) 増田 康博  高エネルギー物理学研究所, 助手 (60150009)
森本 喜三夫  高エネルギー物理学研究所, 教授 (10011579)
松木 征史  京都大学, 化学研究科, 助教授 (50037941)
舟橋 春彦  京都大学, 大学院・理学研究科, 助手 (00283581)
延与 秀人  京都大学, 大学院・理学研究科, 助教授 (30213606)
今井 憲一  京都大学, 大学院・理学研究科, 教授 (70025493)
清水 裕彦  京都大学, 高エネルギー研究所, 助手 (50249900)
Project Period (FY) 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥120,700,000 (Direct Cost: ¥120,700,000)
Fiscal Year 1996: ¥5,800,000 (Direct Cost: ¥5,800,000)
Fiscal Year 1995: ¥8,900,000 (Direct Cost: ¥8,900,000)
Fiscal Year 1994: ¥38,000,000 (Direct Cost: ¥38,000,000)
Fiscal Year 1993: ¥45,000,000 (Direct Cost: ¥45,000,000)
Fiscal Year 1992: ¥23,000,000 (Direct Cost: ¥23,000,000)
Keywords弱いマトリックス・エレメント / スピン回転 / パリティ非保存効果 / ペンタセン / ヘリウム3偏極 / 時間反転 / 減偏極 / レーザーによる陽子偏極 / 増幅メカニズム / 陽子偏極法 / レーザーによる偏極 / 空間・時間対称性 / 共鳴吸収 / 弱い相互作用 / 熱外中性子 / ランタン核 / 透過中性子 / ガンマ線 / 陽子偏極 / 空間・時間反転対称性 / p波共鳴吸収 / 入射ヘリシティー / ランタン標的
Research Abstract

1.スポレーション中性子をアンモニアを用いた偏極陽子フィルターで偏極させてトリウム、インジウム、銀、よう素、すず、アンチモン、キセノン等の原子核に当て、透過中性子及び中性子捕獲ガンマ線を精度よく測定した。これにより中性子の核によるp波共鳴吸収における弱いマトリックス・エレメントを統計的解析法を用いて決定することができた。
2.ビームの進行方向に垂直に偏極させた0.734eVの中性子をランタン核に当てたとき透過して出てくる中性子のスピン方向が入射中性子のスピン方向に対して回転する角度を測定し、パリティ非保存項の実数部を決定する試験的研究を行なった。
3.ペンタセンをドープしたナフタレン及びp-タフェニールにレーザービームを照射し、triplet状態に励起した状態でマイクロ波によって動的偏極を起こさせる陽子偏極法を開発した。これによって陽子を約30%偏極することに成功し、中性子偏極用フィルターとして用いることが可能であることを実証した。
4.時間反転パラメターの測定に必要な中性子偏極度測定装置として偏極ヘリウム3フィルターを製作した。またその偏極度をNMR測定法と中性子透過法で測定し、それらの相対的較正を行なった。
3.偏極中性子と整列した原子核の反応における時間反転の破れを探索するためにホルミウム中での低速中性子の減偏極データを解析し、20eV以上の中性子では減偏極が顕著とはならないことを確認した。

Report

(5 results)
  • 1996 Annual Research Report
  • 1995 Annual Research Report
  • 1994 Annual Research Report
  • 1993 Annual Research Report
  • 1992 Annual Research Report
  • Research Products

    (29 results)

All Other

All Publications (29 results)

  • [Publications] J.J.Szymanski,et al.: "Observation of a large parity nonconserving analyzing power in Xe" Phys.Rev.C. 53. R2576-2580 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] T.Kawai,et al.: "An improvement of the detection effciency of the detection efficiency of a solid state UCN detector with a ^6Li/Ti multilayer neutron converter" Nucl.Instrum.Methods. A378. 561-563 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] K.Maehata,et al.: "Detection of synchrotron radiation by Nd-based superconducting tunnel junctions" Jpn.J.Appl.2,Lett.35. L178-181 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] H.Funahashi,et al.: "Interferometer for cold neutrons using multilayer mirrors" Phys.Rev.A. 54. 649-651 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] A.Rusek,et al.: "Strangelet search and light nucleus production in relativistic Si+Pt and Au+Pt collisions" Phys.Rev.C. 54. R15-19 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] I.Ogawa,et al.: "Interactions of cosmic axions with Rydberg atoms in resonant cavities via the Primakoff process" Phys.Rev.D. 53. R1740-1744 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] M.B.Johnson: "Microscopic,Model-space Apporoach to Parity Nonconservation in Compound Nuclei" Phys.Rev.C51. 999-1013 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] P.P.J.Delheij: "The TRIPLE Spin Filter" Nucl.Inst.Meth.A336. 120-121 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Yi-Fen Yen: "Studies of Gamma Background in a Pulsed Epithermal Neutron Beam and the Neutron-Boron Capture in a B-loaded Hydorogenous Scinti" Proc.of the First International Workshop on Accelerator-based Neutron sources for Boron Neutron. 351-355 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] S.J.Seestrom: "New Results from Los Alamos in the Study of Parity Violation in Neutron Resonances" Proc.of Second International Seminer on Interaction of Neutron with Nuclei(JINR,Dubna,Russia,1995). 50-53 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] J.D.Bowman: "Parity Violation in the Compound Nucleus" Proc.of Fifth Conference on Interactions of Particle & Nuclear Physics(AIP 335,New York,1995). 532-534 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Yi-Fen Yen: "Study of Parity and Time-Reversal Violation in Neutron-Nucleus Interactions)" Proc.of Polarization Phenomena in Nuclear Physics(AIP339,New York,1995). 120-135 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 避井健二: "Neutron spin rotation and P-violation" Hyperfine Interact.84. 199-204 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 佐藤広海: "Polarized ^3He system for T- and P- violation neutron experiments" Hyperfine Interact.84. 337-344 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 安達利一: "Test of parity violation and time reversal invariance in slow neutron absorption reactions" Nucl. Phys. A. 577. 433-441 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 高橋義朗: "A new design of a polarized target for the test of time reversal" Phys. Lett. B. 326. 27-30 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 安達利一: "Test of Space-Time Symmetries using Slow Neutron in Japan" Proc. of Int. Workshop on Time Reversal Invariance and Parity Violation in Neutron Reaction,Dubna. 96-110 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 清水裕彦: "Polarized Target for T-Violation Experiment" Proc. of Int. Workshop on Time Reversal Invariance and Parity Violation in Neutron Reaction,Dubna. 135-137 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 醍醐元正: "High Proton Polarization at Room Temperature" Proc. of Spin 94 conference, Bloomington. (to be publishied). (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 清水裕彦: "Longitudinal Asymmetry and Gamma Ray Angular Distribution in Neutron Radiative Capture Reactions" Nuclear Physics. A552. 293-305 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 高橋義朗: "Possible Nuclear Polarization of ^<137>La in Nd^<3+>:LaAlo_3 for the Test of Time Reversal Invariance" Nuclear Instrument and Method. A336. 586-590 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 清水裕彦: "Polarized Target for T-violation Experiment" Proc.of the Int.Workshop on Time Reversal Invariance and Parity Violation in Neutron Reactions,Dubna,Russia. (to be published). (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] J.D.Bowman: "Data on PV in the Compound Nucleus and it's interpretation" Proc.of the Int.Workshop on Time Reversal Invariance and Parity Violation in Neutron Reactions,Dubna,Russia. (to be published). (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] 安達利一: "Test of Space-Time Symmetries using Slow Neutrons in Japan" Proc.of the Int.Workshop on Time Reversal Invariance and Parity Violation in Neutron Reactions,Dubna,Russia. (to be published). (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] 増田康博: "Symmetry Violations under Space Reflection and Time Reversal and Neutron Spin Rotation" Proc.of 10th Int.Symp.on High-Energy Spin Physics,Nagoya,Japan. 745-751 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] H.M.SHIMIZU: "Longitudinal Asymmetry and γ-ray Angular Distribution in Neutron Radiative Capature Reactions" KEK Preprint To be published in Nucl.Phys.A.92-52. 1-25 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Y.MASUDA: "Neutron Polarization for P-and T-Violation Experiments" KEK Preprint To be published in Hyperfine Interactions. 92-124. 1-8 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] H.SATO: "Polarized ^3He System for T-and P-Violation Neutron Experiments" KEK Preprint To be published in Hyperfine Interactions. 92-125. 1-7 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] K.SAKAI: "Neutron Spin Rotation and P-Violation" KEK Preprint To be published in Hyperfine Interactions. 92-126. 1-6 (1992)

    • Related Report
      1992 Annual Research Report

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Published: 1992-04-01   Modified: 2017-10-06  

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