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Giant Mesonic Effects in the Time Component of Weak Nucleon Axial Vector, and Chiral Invariance

Research Project

Project/Area Number 63420006
Research Category

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

Allocation TypeSingle-year Grants
Research Field 核・宇宙線・素粒子
Research InstitutionOsaka University

Principal Investigator

MINAMISONO Tadanori  Dept. Phys, Osaka Univ, Professor, 理学部, 教授 (20028210)

Co-Investigator(Kenkyū-buntansha) MIZOBUCHI Akira  Inst. for Nuclear Study, The Tokyo Univ, Professor, 原子核研究所, 教授 (40028121)
FUKUDA Mitsunori  Dept. Phys, Osaka Univ, Research Associate, 理学部, 助手 (50218939)
MATSUTA Kensaku  Dept. Phys, Osaka Univ, Research Associate, 理学部, 助手 (50181722)
NOJIRI Yoichi  Dept. Phys, Osaka Univ, Associate Professor, 理学部, 助教授 (90028233)
Project Period (FY) 1988 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥34,300,000 (Direct Cost: ¥34,300,000)
Fiscal Year 1990: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1989: ¥20,600,000 (Direct Cost: ¥20,600,000)
Fiscal Year 1988: ¥11,700,000 (Direct Cost: ¥11,700,000)
KeywordsWeak Nucleon Currents / Axial Vactor / Asymmetric Beta-Decay / Alignment Correlation / Boson / Heavy-Ion Accelerator / Spin Control / Mirror Magnetic Moment / 非対称ベ-タ崩毅 / 超微細構造相互作用 / 時間成分 / 擬ベクトル / 非対称ベータ崩壊 / 加速器 / 弱磁気項 / ビーム / フォイル
Research Abstract

Since the soft-pionic effect in the time-like component of the weak nucleon axial vector is dependent on the momentum transferred in the decay process, the effect are very much enhanced compared with that of the space components ; it reaches to about 40 % of the impulse value. Because of such huge enhancement, it is suitable as a probe for the investigation of the betaーDecay processes, chiral invariance, and the nature of the pion as boson. For such experimental works, the alignment correlation coefficients of mirror beta decays, and the 0^---0^+ transition rates have been the quantities to be measured. As those values were as small as the weak magnetism term, the first step of the measurements was to develop equipments in which the beta-ray detectors were free from the scattered beta rays, and to develop spin manipulating technique that was imperative to create spin alignments converted from largely polarized ensemble. Because of these technical improvements, it became possible to deduce precisely the weak magnetism form factor from the analyses of the energy spectra of ^<12>B and ^<12>N. Therefore, this term can also be used as a probe of the effective masses of the nucleons, which may be used for the studies of quark effects in nucleus.
One other important direction of the present project was to develop facilities for the production of the spin polarized betaーemitting nuclides for the present studies. A new acceleration techniques was developed for the unstable target fragments to get 100 keV/nucleon, i. e., an RFQ LINAC was connected with an ion source. To polarize the ions, beam-foil method was developed. Another equipment was fragment separator for the high-energy projectile fragments produced in high-energy heavy-ion reactions. In this case, it was discovered that the projectile was polarized in the reaction itself.

Report

(4 results)
  • 1990 Annual Research Report   Final Research Report Summary
  • 1989 Annual Research Report
  • 1988 Annual Research Report
  • Research Products

    (58 results)

All Other

All Publications (58 results)

  • [Publications] Y.Nojiri,K.Matsuta,T.Minamisono,J.Symons,et al.: "Polarization Creation by BeamーFoil Interaction for Projectile Fragements Produced in HighーEnergy HeavyーIon Collisions & NMR of ShortーLived ^<39>Ca" Nuclear Instruments and Methods in Physics Research. B33. 193-197 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] T.Minamisono,Y.Nojiri,K.Matsuta,M.Fukuda,et al.: "Induced Terms of Week Nucleon Currents" Nuclear Week Process and Nuclear Structure(World Scientific). 58-63 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] K.Matsuta: "Magnetic Moment of Projectile Fragment ^<43>Ti." Proc.Ist.Int.Conf.on Radioactive Nuclear Beams,Bekeley,1989,World Scienific,. 457-464. (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] T.Minamisono: "Magnetic Moment of ^<41>Sc(I^π=7/2^-)and Effective gーFactors." Proc.Ist.Int.Conf.on Radioactive Nuclear Beams,Berkeley,1989,World Scientific,. 507-515 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] T.Minamisono,Y.Nojiri,K.Matsuta,et al.: "Precision Measurement of the Magnetic Moment of ^<41>Sc(I^π=7/2^-,T_<1/2>=0.59S)and Isoscalar gーFactors of Orbital and Spin Angular Momento" Nuclear Physics. A516. 365-384 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] A.Ozawa: "Operation of RFQ Linac for Acceleration of BetaーEmitters" Annual Report 1989,Osaka Univ.Lab.Nuclear Studies,. 78-79 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] S.Momomta: "The MultiーTilted Foil Technique Applied to ShortーLived BetaーEmitters ^<12>B,^<20>F,and ^<41>Sc." Annual Report 1989,Osaka Univ.Lab.Nuclear Studies,. 63-65 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Y.Nojiri: "Nuclear Spin Polarization of BetaーRadioactive Nuclei Created by Means of Tilted Foil Technique" Proc.7th Int.Conf.on Polarization Phenomena in Nuclear Physics,Paris,1990,in press. C6. 549-552 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] T.Minamisono: "Electromagnetic Moments of the Doubly Closed Shell ±1 Nucleon Nuclei and OnーLine Nuclear Polarization." Hyperfine Interactions. 59. 31-40 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] T.Minamisono: "Magnetic Moment of BetaーEmitting ^<41>Sc(I^π=7/2^-)and Knight Shift in Pt Metal." Hyperfine Interactions. 59. 149-152 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Y.Nojiri: "BetaーPolarization Measurements in Solids." Hypefine Interactions. 60. 599-614 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] A.Ozawa: "Polymer Foil Applicable to the Tilted Foil Technique." Hyperfine Interactions. 61. 1383-1386 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] K.Matsuta: "NMR on ShortーLlved BetaーEmitter ^<43>Ti using New Fragment Separator at LBL." Hyperfien Interactions. 61. 1387-1390 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Y. Nojiri: "Polarization Creation by the Beam-Foil Interaction for Projectile Fragments Produced in High Energy Collisions and NMR Detection of ShortーLived betaーEmitting ^<39>Ca" Nucl. Instr. Method Phys. Res.B33. 193-197 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Y. Nojiri: "Nuclear Polarization of Short-Lived beta-Emitters ^<18>Li, ^<12>B, and ^<27>Si Created by the Tilted Foil Technique" Nucl. Inst. Method Phys. Res.B33. 252-254 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] T. Minamisono: "Location of Light Impurity ^<12>N in V Crystal" Inst. and Method Phys. Res.B33. 641-644 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Y. Kuno: "MNR Studies on Polarized ^<12>B Implanted Highly Oriented Pyrolytic Graphite" Hyperfine Interactions. 39. 253-267 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] T. Minamisono: "Induced Terms of Weak Nucleon Currents" World Scientific Pub. Co.58-63 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] T. Minamisono: "Electromagnetic Moments of the Doubly Closed Shell +1 Nucleon Nuclei and On-Line Nuclear Polarization" Hyperfine Interactions. 59. 31-40 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] T. Kobayashi: "Electromagnetic Dissociation and Soft Giant Dipole Resonance of the Neutron-Dripline Nucleus ^<11>Li" Phys. Lett.232. 51-55 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] M. Takai: "Ion implantation in SingleーCrystal Magnetic Ferrite" Nucl. Inst. Method Phys. Res.B39. 728-731 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] T. Minamisono: "Precision Measurement of the Magnetic Moment of ^<41>Sc (I^<&2>=7/2^-, T_<1/2>=0.59sec) and Isoscalar g-Factors of Orbital and Spin Angular Momenta" Nucl. Phys.A516. 365-384 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] K. Asahi: "Half-life and Branching Ratios of ^<13>O Beta Decay" Phys. Rev.C41. 358-361 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] T. Minamisono: "Magnetic Moment of Beta-Emitting ^<41>Sc (I^<pi>=7/2^-) and Knight Shift in Pt Metal" Hyperfine Interactions. 59. 149-152 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] T. Minamisono: "Quadrupole Moment of the Doubly Closed Shell +1 Nucleon Nucleus ^<41>Sc (I^<pi>=7/2^-)" Hyperfine Interactions. 59. 153-156 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] A. Kitagawa: "Hyperfine Interactions of beta Emitter ^<12>B and ^<12>N in Mg Crystal" Hyperfine Interactions,. 60. 869-872 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Y. Nojiri: "Nuclear Spin Polarization of Beta-Radioactive Nuclei Created by Means of Tilted Foil Technique" Colloque de Physique. Suppl. n22 C6. 549-552 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] K. Matsuta: "NMR on Short-Lived BetaーEmitter ^<43>Ti Using New Fragment Separator at LBL" Hyperfine Interactions. 61. 1387-1390 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] A. Ozawa: "Polymer Foil Applicable to the Tilted Foil Technique" Hyperfine Interactions. 61. 1383-1386 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] I. Tanihata: "Systematics of the Nuclear Radii and Neutron Halo" Radioactive Nuclear Beams, ed. W. D. Myers, J. M. Nitshke, and E. B. Norman. World Scientific Pub.429 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] K. Matsuta: "Separation of Projectile Fragments by Means of Rigidity and Range Analysis" Radioactive Nuclear Beams, ed. W. D. Meyers, J. M. Nitshke, and E. B. Norman. World Scientific Pub.575 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Y. Nojiri: "Nuclear Spin Polarization of Beta-Radioactive Nuclei Created by Means of Tilted Foil Technique" Proc. 7-th Int. Conf. on Pol. Phen. in Nucl. Phy.Paris. (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Y. Nojiri: "BetaーPolarization Measurements in Solids" Hyperfine Interactions. 60. 599-614 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Y.Nojiri,K.Matsuta,T.Minamisono,J.Symons,et al.: "Polarization Creation by BeamーFoil Interaction for Projectile Fragments Produced in HighーEnergy HeavyーIon Collisions & NMR of ShortーLived ^<39>Ca" Nuclear Instruments and Methods in Physics Research. B33. 193-197 (1988)

    • Related Report
      1990 Annual Research Report
  • [Publications] T.Minamisono,Y.Nojiri,K.Matsuta,M.Fukuda,et al.: "Induced Terms of Weak Nucleon Currents" Nuclear Weak Process and Nuclear Structure (World Scientific). 58-63 (1989)

    • Related Report
      1990 Annual Research Report
  • [Publications] K.Matsuta: "Magnetic Moment of Projectile Fragment ^<43>Ti." Proc.Ist.Int.Conf.on Radioactive Nuclear Beams,Berkeley,1989,World Scientific,. 457-464 (1989)

    • Related Report
      1990 Annual Research Report
  • [Publications] T.Minamisono: "Magnetic Moment of ^<41>Sc(I^π=7/2^ー)and Effective gーFactors." Proc.Ist.Int.Conf.on Radioactive Nuclear Beams,Berkeley,1989,World Scientific,. 507-515 (1989)

    • Related Report
      1990 Annual Research Report
  • [Publications] T.Minamisono,Y.Nojiri,K.Matsuta,et al.: "Precision Measurement of the Magnetic Moment of ^<41>Sc(I^π=7/2^ー,T_<1/2>=0.59S) and Isoscalar gーFactors of Orbital and Spin Angular Momento" Nuclear Physics. A516. 365-384 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] A.Ozawa: "Operation of RFQ Linac for Acceleration of BetaーEmitters" Annual Report 1989,Osaka Univ.Lab.Nuclear Studies,. 78-79 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] S.Momomta: "The MultiーTilted Foil Technique Applied to ShortーLived BetaーEmitters ^<12>B, ^<20>F,and ^<41>Sc." Annual Report 1989,Osaka Univ.Lab.Nuclear Studies,. 63-65 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] Y.Nojiri: "Nuclear Spin Polarization of BetaーRadioactive Nuclei Created by Means of Tilted Foil Technique" Proc.7th Int.Conf.on Polarization Phenomena in Nuclear Physics,Paris,1990,in press. C6. 549-552 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] T.Minamisono: "Electromagnetic Moments of the Doubly Closed Shell ±1 Nucleon Nuclei and OnーLine Nuclear Polarization." Hyperfine Interactions. 59. 31-40 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] T.Minamisono: "Magnetic Moment of BetaーEmitting ^<41>Sc(I^π=7/2^ー) and Knight Shift in Pt Metal." Hyperfine Interactions. 59. 149-152 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] Y.Nojiri: "BetaーPolarization Measurements in Solids." Hypefine Interactions. 60. 599-614 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] A.Ozawa: "Polymer Foil Applicable to the Tilted Foil Technique." Hyperfine Interactions. 61. 1383-1386 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] K.Matsuta: "NMR on ShortーLIved BetaーEmitter ^<43>Ti using New Fragment Separator at LBL." Hyperfien Interactions. 61. 1387-1390 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] T.Minamisono,Y.Nojiri,K.Matsuta,M.Fujinaga: "Location of beta-Emitting ^<12>N in V crystal" Nuclear Instruments and Methods in Physics Research. B33. 641-644 (1988)

    • Related Report
      1989 Annual Research Report
  • [Publications] Y.Nojiri,K.Matsuta,T.Minamisono,J.Symons,et al.: "Polarization Creation by Beam-Foil Interaction for Projectile Fragments Produced in High-Energy Heavy-Ion Collisions & NMR of Short-Lived ^<39>Ca" Nuclear Instruments and Methods in Physics Research. B33. 193-197 (1988)

    • Related Report
      1989 Annual Research Report
  • [Publications] T.Minamisono,Y.Nojiri,K.Matsuta,M.Fukuda,et al.: "Induced Terms of Weak Nucleon Currents" Nuclear Weak Process and Nuclear Structure(World Scientific). 58-63 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] K.Matsuta,Y.Nojiri,T.Minamisono,et al.: "NMR on Beta-Emitting ^<43>Ti Produced Through Projectile Fragmentation in Relativistic Heavy-Ion Collisions" Hyperfine Interactions. (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] T.Minamisono: "Electromagnetic Moments of Doubly Closed Shell ±1 Nucleon Nuclei and Nuclear Polarization" Hyperfine Interactions. (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] A.Ozawa,Y.Nojiri,T.Minamisono,et al.: "Polymer Foil Applicable to the Tilled Foil Technique" Hyperfine Interactions. (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] T.Minamisono;Y.Nojiri;K.Matsuta;M.Fujinaga;et al.: Nuclear Instruments and Methods in physics Resesrch. B33. 641-644 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] Y.Nojiri;K.Takeyama;K.Matsuta;T,Minamisono: Nuclear Instruments and Methods in Physics Research. B33. 252-254 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] Y,Nojiri;K.Matsuta;T.Minanisono;et al.: Nuclear Instruments and Methods in Phsics Research. B33. 193-197 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] Y.Nojiri;J.Imazato;T.Minamisono;et al.: Hyperfine Interactions. 39. 253-267 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 南園忠則、野尻洋一 他: 日本物理学会予稿集. 秋分科. 70-70 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 小沢顕、百田佐多生、野尻洋一、南園忠則: 日本物理学会予稿集. 秋分科. 69-69 (1988)

    • Related Report
      1988 Annual Research Report

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Published: 1988-04-01   Modified: 2016-04-21  

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