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Time Reversal Invariance Test in Very Slow Neutron Reactions

Research Project

Project/Area Number 06044111
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionJoint Research
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

MASAIKE Akira  Kyoto University, Graduate School of Science, Professor, 大学院・理学研究科, 教授 (40022587)

Co-Investigator(Kenkyū-buntansha) ROBERSON R.  Duke University, Professor, 教授
BOWMAN D.  Los Alamos National Laboratory, Senior Physicist, 中間子施設, 主任研究員
TAKAHASHI Yoshiro  Kyoto University, Graduate School of Science, Lecture, 大学院・理学研究科, 講師 (40226907)
SHIMIZU Hirohiko  The Institute of Physical and Chemical Research, Research Associate, 研究員 (50249900)
EN'YO Hideto  Kyoto University, Graduate School of Science, Associate Professor, 大学院・理学研究科, 助教授 (30213606)
YABUZAKI Tutomu  Kyoto University, Graduate School of Science, Professor, 大学院・理学研究科, 教授 (60026127)
今井 憲一  京都大学, 理学部, 教授 (70025493)
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥8,000,000 (Direct Cost: ¥8,000,000)
Fiscal Year 1995: ¥4,100,000 (Direct Cost: ¥4,100,000)
Fiscal Year 1994: ¥3,900,000 (Direct Cost: ¥3,900,000)
Keywordsneutron / transmission / parity / time reversal / matrix element / resonance absorption / polarized filter / capture gamma-ray / proton polarization / 対称性 / 中性子 / 共鳴反応 / 増幅効果 / 動的偏極法 / ランタンアルミネート
Research Abstract

Several experimental tests of parity violation in neutron resonance absorption reactions have been carried out by means of the capture gamma-ray measurement and neutron transmission method using polarized slow neutrons at Los Alamos and KEK in order to determine the weak matrix elements in hadron-hadron interactions. At Los Alamos the determination of weak matrix element has been performed with the help of statistical model of compound nucleus. The likelihood analysis has been done for mean-zero }Gaussian randam variables for the helicity asymmetries in many p-wave resonances interfered with several neighboring s-wave resonances. On the other hand, exit channel interference effects in capture gamma-ray reactions have been measured at KEK.The measurement of the term A_9・sigma_n^^*・k_<gamma>^^* has been made on the p-wave resonance (E_n=0.734eV) of ^<139>La, where sigma_n^^* is the neutron spin direction and k_<gamma>^^* is the direction of emitted gamma-rays. These measurements are usef … More ul to find out the sensitivity of the observables of the time reversal violation.
Neutrons have been polarized using the polarized proton and ^3He filters. Protons in ethylene glycol with Cr^V complexes are polarized dynamically in 0.4K and 25KG.A new method of polarization has been developed, in which protons in pentacence-doped naphthalene have been polarized by means of laser excitation and dynamical polarization of a photo-excited triplet state of pentacene in room temperature and in liquid nitrogen temperature.
^3He gas has been polarized by means of the optical pumping.
It has been found that La nucleus in LaA1O_3, which is a very important nucleus for the test of time reversal invariance, can be polarized by means of the dynamical method. The polarization has been more than 20%.
The depolarization of low energy polarized neutrons in holmium crystal has been measured and found not to be so large in the energy region higher than 20 eV.Therefore, the measurement of a 5-fold correlation parameter in the neutron transmission through holmium became feasible. Less

Report

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

    (36 results)

All Other

All Publications (36 results)

  • [Publications] T.Adachi: "Test of Parity Violation and Time Reversal Invariance in Slow Neutron Absorption Reactions" Nuclear Physics. A577. 433-441 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Y.Takahashi: "A New Design of A Polarized Target for the Test of Time Reversal Invariance in a Neutron Transmission Experiment" Physics Letter. B326. 27-30 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] J.N.Knudson: "Neutron Deformation in ^<165>Ho" Physics Review. C50. 909-917 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] J.D.Bowman: "Data on Parity Violation in the Compound Nucleus and Its Interpretation" Proc.of the Second International Workshop on Time Reversal Invariance and Parity Violation in Neutron Reactions (Dubna,Russia,1993). 210-219 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Yi-Fen Yen: "Study of Parity and Time-Reversal Violation in Neutron-Nucleus Interactions" Physics Review Letter. (to be published).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] S.J.Seestrom: "Parity Nonconservation in Neutron Capture on ^<113>Cd" Physics Review Letter. (to be published).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] M.B.Johnson: "Microscopic,Model-space Apporoach to Parity Nonconservation in Compound Nuclei" Physics Review. C51. 999-1013 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] P.P.J.Delheij: "The TRIPLE Spin Filter" Nucl.Inst.Meth.A356. 120-121 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Yi-Fen Yen: "Studies of Gamma Background in a Pulsed Epithermal Neutron Beam and the Neutron-Boron Capture in a ^<10>B-loaded Hydorogenous scinti" Proc.of the First International Workshop on Accelerator-based Neutron Sources for Boron Neutron Capture Therapy. 351-355 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] S.J.Seestrom: "New Results from Los Alamos in the Study of Parity Violation in Neutron Resonances" Proc.of Second International Seminar on Interaction of Neutron with Nuclei (JINR,Dubna,1995). 50-53 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] J.D.Bowman: "Parity Violation in the Compound Nucleus" Proc.of Fifth conference on Interactions of Particle & Nuclear Physics (AIP 338,New York,1995). 532-534 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Yi-Fen Yen: "Study of Parity and Time-Reversal Violation in Neutron-Nucleus Interactions" Proc.of Polarization Phenomena in Nuclear Physics (AIP 339,New York,1995). 120-135 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] M.Iinuma: "High Proton polarization in crystalline naphthalene by dynamic nuclear polarization with laser excitation at room temperature and liquid nitrogen temperature" Physics Letter. A208. 251-256 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] M.Iinuma: "Proton Polarization at Room Temperature" AIR' Conference Proceedings. 343. 567-571 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T.Maekawa: "A large nuclear polarization of ^<139>La in Nd^<3+> : LaAlO_3 for testing the time reversal invariance" Nucl.Inst.Meth.A366. 115-119 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T.Adachi: "Test of Parity Violation and Time Reversal Invariance in Slow Neutron Absorption Reactions" Nuclear Physics. A577. 433-441 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Y.Takahashi: "A New Design of A Polarized Target for the Test of Time Reversal Invariance in a Neutron Transmission Experiment Physics Letter" B326. 27-30 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] J.N.Kundson: "Neutron Deformation in ^<165>Ho" Physics Review. C50. 909-917 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] J.D.Bowman: "Data on Parity Violation in the Compound Nucleus and Its Interpretation" Proc.of the Second International Workshop on Time Reversal Invariance and Parity Violation in Neutron Reactions (Dubna, Russia, 199. 210-219 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Yi-Fen Yen: "Study of Parity and Time-Reversal Violation in Neutron-Nucleus Interactions" Physics Review Letter. (to be published).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] S.J.Seestrom: "Parity Nonconservation in Neutron Capture on ^<113>Cd" Physics Review Letter. (to be published).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] M.B.Johnson: "Microscopic, Model-space Approach to Parity Nonconservation in Compound Nuclei" Physics Review. C51. 999-1013 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] P.P.J.Delheij: "The TRIPLE Spin Filter" Nucl.Inst.Meth.A356. 120-121 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Yi-Fen Yen: "Studies of Gamma Background in a Pulsed Epithermal Neutron Beam and the Neutron-Boron Capture in ^<10>B-loaded Hydrogenous scinti" Proc. of First International Workshop on Accelerator -based Neutron Sources for Boron Neutron Capture Therapy. 351-355 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] S.J.Seestrom: "New Result from Los Alamos in the Study of Parity Violation in Neutron Resonances" Proc.of Second International Seminar on Interaction of Neutron with Nuclei (JINR.Dubna, 1995). 50-53 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] J.D.Bowman: "Parity Violation in the Compound Nucleus" Proc. of Fifth conference on Interactions of Particle & Nuclear Physics (AIP 338, New York, 1995). 532-534 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Yi-Fen Yen: "Study of Parity and Time-Reversal Violation in Neutron-Nucleus Interactions" Proc.of Polarization Phenomena in Nuclear Physics (AIP 339, New York, 1995). 120-135 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] M.Iinuma: "High Proton Polarization in crystalline naphthalene by dynamic nuclear polarization with laser excitation at room temperature and liquid nitrogen temperature" Physics Letter. A208. 251-256 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] M.Iinuma: "Proton Polarization at Room Temperature" AIP Conference Proceedings. 343. 567-571 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T.Maekawa: "A large nuclear polarization of ^<139>La in Nd^<3+> : LaA10_3 for testing the time reversal invariance" Nucl.Inst.Meth.A366. 115-119 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T.Adachi,et al.: "Test of Parity Violation and Time Revarsal Invariance in Slow Neutron Absorption Reactions" Nuclear Physics. A577. 433-441 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Y.Takahashi,et al.: "A New Design of A Polarized Target for the Test of Time Reversal Invariance in a Neutron Transmission Experiment" Physics Letter. B326. 27-30 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] J.N.Knudson: "Neutron Detormation in ^<165>H_0" Physics Review. C50. 909-917 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] J.D.Bowman,et al: "Data on Parity Violation in the Compound Nucleus and Its Interpretation" Proc.of the Second International Workshop on Time Reversal Invaviance and Parity Violation in Neutron Reactions (Dubna,Russia,1993). 210-219

    • Related Report
      1994 Annual Research Report
  • [Publications] Yi-Fen Yen,et al.: "Study of Parity and Time-Reversal Violation in Neutron-Nucleus Interactions" Physics Reveiw Letter. (発表予定).

    • Related Report
      1994 Annual Research Report
  • [Publications] S.J.Seestrom,et al.: "Parity Nonconservation in Neutron Cocpture on ^<113>Cd" Physics Reveiw Letter. (発表予定).

    • Related Report
      1994 Annual Research Report

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

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