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Research on Violation of Space-Time Symmetires with Slow Neutrons

Research Project

Project/Area Number 01420003
Research Category

Grant-in-Aid for General Scientific Research (A)

Allocation TypeSingle-year Grants
Research Field 核・宇宙線・素粒子
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

MASAIKE Akira  Kyoto Univ. Fac.of Science Professor, 理学部, 教授 (40022587)

Co-Investigator(Kenkyū-buntansha) MASUDA Yasuhiro  National Lab. High Energy Physics Research Assistant, 助手 (60150009)
ENYO Hideto  Kyoto Univ. Fac.of Science Research Assistant, 理学部, 助手 (30213606)
IMAI Kenichi  Kyoto Univ. Fac.of Science Associate Prof., 理学部, 助教授 (70025493)
三宅 弘三  京都大学, 理学部, 教授 (60025260)
Project Period (FY) 1989 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥18,700,000 (Direct Cost: ¥18,700,000)
Fiscal Year 1992: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1991: ¥4,700,000 (Direct Cost: ¥4,700,000)
Fiscal Year 1990: ¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 1989: ¥8,400,000 (Direct Cost: ¥8,400,000)
KeywordsParity / Time Reversal / Resonance Abosrption / La nucleus / Hilicity Asymmetry / Epithermal Neutron / ランタン核 / γ線角分布 / 空間反転の破れの効果 / γ線放出非対称性 / 時間反転 / p波共鳴準位 / パリティ- / ヘリシティ- / パルス中性子 / 中性子捕獲断面積 / 偏極中性子 / α線放出度 / α線エネルギ- / 偏極低速中性子 / 空間反転の破れ / 中性子捕獲反応 / ヘリシティ-非対称性 / 中性子補獲反応
Research Abstract

The study of parity-violating processes in hadronic interactions is useful to obtain information on the weak flavor conserving force between hadrons.
The parity non-conserving effect was investigated in low energy (n.gamma) reactions for several nuclei with mass number of -100. The longitudinal asymmetries (A_L) were measured in p-wave resonances. It was found to be independent of the gamma-ray energy thresholds. The A 's were measured for the targets of ^<81>Br, ^<93>Nb, ^<108>Pd, ^<111>Cd, ^<124>Sn and ^<139>La. The obtained non-zero values are A_L=(9.8 0.3)%, (2.1 0.1)% and -(1.3+0.7-0.4)% for ^<139>La (E_n=0.734 eV), ^<81>Br(E_n=0.88 eV) and ^<111>Cd(E_n=4.53 eV), respectively. The results can be explained in terms of the interference between two amplitudes of s- and p-wave incident neutrons.
The sigma^^*_n.K^^*_<gamma> correction term for ^<139>La has been also measured. The result suggests the existence of exit-channel parity-mixing in a single gamma-ray transitions.
In addition, we have carried out a test of the measurement of the neutron spin rotation due to the interaction with the ^<139>La nuclei. It was found that the parity violation effect could be observed in the p-wave resonance region. For T-violation experiments, a triple correlation among the neutron spin, the neutron momentum and the target nuclear spin has to be observed. We have found sizable polarization of ^<139>La in crystals of LaF_3and LaA1O_3. It is the first step of the T-violation measurement.
Polarization experiments of the ^3He and the proton in room temperature have been carried out using laser beams. These are quite useful for the polarizer and the polarization analyzer of neutrons in future.

Report

(5 results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report
  • 1990 Annual Research Report
  • 1989 Annual Research Report
  • Research Products

    (47 results)

All Other

All Publications (47 results)

  • [Publications] Akira Masaike: "Topics on Fundamental Symmetries in Particle Physics" Hyperfine Interactions. 74. 139-148 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 政池 明: "超低エネルギー中性子による素粒子物理学" 日本物理学会誌. 44. 649-656 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Y.Masuda: "Present Status of P-violation and Future T-violation Experiments on Neutron-Nucleus Interaction at KEK" Proceedings of 18th INS International Symposiumon Physics with High Intensity Hadron Accelerators. 293-303 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Y.Masuda: "Lanthanum Nuclear Polarization for T-violation Experiment" Proceedings of International Conference on Advanced Neutron Source(ICANS)XI. 1002-1005 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T.Adachi: "Parity-nonconservation in Neutron Radiative Capture Reaction" AIP Conf.Proc.(Intersection between Particle and Nuclear Physics). 243. 946-948 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Y.Masuda: "A Resonance Spectrometer without Doppler Broadening" Physics B. 181B. 965-966 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Y.Masuda: "T-violation Neutron Experiment and Polarized 3He" KEK Preprint. 91-127. 1-8 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Y.Masuda: "Neutron Spin as a Probe Concerning P and T Violation" KEK Preprint. 92-123. 1-8 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 政池 明: "超低エネルギー極限状態の中性子物理学" 研究報告(超低エネルギー極限状態の中性子物理学). 1-88 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Hirohiko Shimizu: "parity Nonconservation in Neutron Radiative Capture Reactions" Memoirs of the Faculty of Science,Kyto University,Series A. 32-2-6. 203-254 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] H.Shimizu: "Longitudinal Asymmetry and γ-ray angular Distribution in Neutron Radiative Capture Reactions" KEK Preprint. 92-52. 1-25 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] A.Masaike: "Capture γ-ray Measurement Using VME Data Acquisition System(LAMPF 1992)" Procceedings on TRIPLE-Collaboration. 1-16 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] H.Sato: "Polarized ^3He System for T-and P-Violation Neutron Experiments" KEK Preprint. 92-125. 1-7 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] K.Sakai: "Neutron Spin Rotation and P-Violation" KEK Preprint. 92-126. 1-6 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Y.Masuda: "Neutron Polarization for P-and T-Violation Experiments" KEK Preprint. 92-124. 1-8 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Akira Masaike: "Topics on Fundamental Symmetries in Particle Physics" Hyperfine Interactions. 74. 139-148 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Akira Masaike: "Particle Physics with Ultra Low Energy Neutron" Journal of the Physical Sociaty of Japan. 44. 649-656 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Y.Masuda: "Present Status of P-violation and Future T-viola Experiments on Neutron-Nucleus Interaction at KEK" Proceedings of 18th INS International Symposium on Physics with High Intensity Hadron Accelerators. 293-303 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Y.Masuda: "Lanthanum Nuclear Polarization for-T-violation Experiment" Proceedings of International Conference on Advanced Neutron Source (ICANS) XI. 1002-1005 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T.Adachi: "Parity-nonconservation in Neutron Radiative Capture Reaction" AIP Conf. Prof.(Intersection between Particle and Nuclear Physics). 243. 946-948 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Y.Masuda: "A Resonance Spectrometer without Doppler Broaden" Physics B. 181B. 965-966 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Y.Masuda: "T-violation Neutron Experiment and Polarized 3He" KEK Preprint. 91-127. 1-8 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Y.Masuda: "Neutron Spin as a Probe Concerning P and T Violation" KEK Preprint. 92-123. 1-8 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] A.Masaike: "Neutron Physics with Ultra Low Energy Neutron" Reprint. 1-88 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Hirohiko Shimizu: "Parity Nonconservation in Neutron Radiative Capture Reactions" Memoirs of the Faculty of Science,Kyoto University,Series A. 32-2-6. 203-254 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] H.Shimizu: "Longitudinal Asymmetry and gamma-ray Angular Distribution in Neutron Radiative Capture Reactions" KEK Preprint. 92-52. 1-25 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] A.Masaike: "Capture gamma-ray Measurement Using VME data Acquisition System (LAMPF 1992)" Proceedings on TRIPLE-Collaboration. 1-16 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] H.Sato: "Polarized ^3He System for T- and P-Violation Neutron Experiments" KEK Preprint. 92-125. 1-7 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] K.Sakai: "Neutron Spin Rotation and P-Violation" KEK Preprint. 92-126. 1-6 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Y.Masuda: "Neutron Polarization for P- and T-Violation Experiments" KEK Preprint. 92-124. 1-8 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Y.Masuda: "Neutron Spin as a Probe Concerning P and T Violation" KEK-Preprint(Proc.III International Symp.on Weak and Electricmaqnetic Interaction in Nuclei). 92-123. 1-8 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] H.Shimizu: "Parity Nonconservation in Neutron Radiative Capture Reactions" Memoirs of the Faculty of Science,Kyoto University,Series A. 32-2-6. 203-254 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 政池 明: "超低エネルギー極限状態の中性子物理学" 研究会報告(論文課題に同じ). 1-88 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] H.Shimizu: "Lonqitudinal Asymmetry and γ-ray Anqular Distribution in Neutron Radiative Capture Reactions" KEK Preqrint. 92-52. 1-25 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] A.Masaike: "Capture γ-ray Measurement Using VME Data Acquisition Systen(LAMPF1992)" Proceedings on TRIPLE-Collaboration. 1-16 (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] H.Sato: "Polarized He^3 System for T-and P-Violation Neutron Experiments" Kek Preprint. 92-125. 1-7 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] H.M.Shimizu: "Parity Nonconservation in Neutron Radiative Capture Reactions" Memoirs of Faculty of Science,Kyoto University,Sevies of Phisics. Vol.38. NO.2 (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] Y.Masuda: "A Resonance Spectrometer without Dopper Broadening" Proc.of International Conference on Neutron Scattering,Oxford,1991. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] H.M.Shimizu: "Scintillation Detector System in NucleonーNucleus Experiments" KEK Report(ICANSーXI). 90ー25. 1 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] Y.Masuda: "Lanthanum Nuclear Polarization for Tーviolation Experiment" KEK Report(ICANSーXI). 90ー25. 1 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] T.Adachi: "Parity NonーConservation in Neutron Radiative Capture Reaction" Proc.of 4th Conference on Intersections between Particals and Nuclean Phisics,(Tucsan). (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] Y.Masuda: "T Violation Neutron Experiment and Polarized ^3He" KEK Report(Hyperfine Interaction). 91ー127. 1 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 増田 康博: "Status of Pーviolation and Future Tーviolation Experiments on NeutronーNucleus Interaction at KEK" Proceedings of 18th INS International Symposium on Physics with High Intensity Hadron Accelerators. (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 清水 裕彦: "Parity NonーConservation Effect in NeutronーNucleus Reaction" Proceedings of 4th Conference on Intersection between Particle and Nuclear Physics. (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] 清水 裕彦: "Scintillation Detector System in NeutronーNucleus Experiments" Proceedings of 11th Meeting of International Collaboration on Advanced Neutron Sources. (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] 増田康博: "Longitudinal Asymmetry in a Neutron Radiative Capture Reaction of ^<139>La" Nuclear Physics. A504. 269-276 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] 政池明 他: "超低エネルギ-中性子による素粒子物理" 日本物理学会誌. 44. 649-656 (1989)

    • Related Report
      1989 Annual Research Report

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Published: 1989-04-01   Modified: 2016-04-21  

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