• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Study of Weak Hyperon Nucleon Interaction by means of Decay Particle Spectroscopy

Research Project

Project/Area Number 08239205
Research Category

Grant-in-Aid for Scientific Research on Priority Areas

Allocation TypeSingle-year Grants
Research InstitutionOsaka University

Principal Investigator

KISHIMOTO Tadafumi  Osaka University, Graduate School of Science Professor, 大学院・理学研究科, 教授 (90134808)

Co-Investigator(Kenkyū-buntansha) EJIRI Hiroyasu  Osaka University, Research Center for Nuclear Physica Professor, 核物理研究センター, 教授 (80013374)
AJIMURA Shuhei  Osaka University, Graduate School of Science Research Associate, 大学院・理学研究科, 助手 (10273575)
SAKAGUCHI Atsushi  Osaka University, Graduate School of Science Associate Professor, 大学院・理学研究科, 助教授 (70205730)
TAMURA Keisuke  Fukui Medical School Associate Professor, 助教授 (30212046)
NOUMI Hiroyuki  National Laboratory for High Energy Physics Research Associate, 助手 (10222192)
野呂 哲夫  大阪大学, 核物理研究センター, 助教授 (30164750)
中野 貴志  大阪大学, 核物理研究センター, 助教授 (80212091)
Project Period (FY) 1996 – 1998
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥55,200,000 (Direct Cost: ¥55,200,000)
Fiscal Year 1998: ¥11,100,000 (Direct Cost: ¥11,100,000)
Fiscal Year 1997: ¥29,000,000 (Direct Cost: ¥29,000,000)
Fiscal Year 1996: ¥15,100,000 (Direct Cost: ¥15,100,000)
KeywordsHypernuclei / Strangeness / Weak nonmesonic decay / Spin-orbit interaction / Baryon-Baryon Interaction / Short range correlation / Quark degree of freedom / ハイペロン核子相互作用 / 非対称弱崩壊 / 偏極 / 弱崩壊 / パリティ非保存
Research Abstract

It is well known that hadrons (Baryons and mesons) are made up of quarks and gluons by the strong interaction. The interaction among hadrons is not well understood especially due to our inability to describe the quark confinement beased on a known principle. The nucleon nucleon interaction is well described by meson exchange theory except at short distances where size of hadrons has to be taken into account in the model. Quark and gluon degrees of freedom have to be present though flexibility of the meson change model forbits to pin down clearly the existence of the freedom. The SU(3) extention of the model should be the best testing gound for many models that describe well the NN interaction. In the present research we focused our attention to the phenomena which originate short range interaction. Following subjects were studied in this research.
(1) Parity violation in the weak nonmesonic decay of hypernuclei.
Weak nonmesonic decay NΛ → NN has a large momentum transfer that make interaction at short distance vital. We demonstrated production of polarized Λ hypernuclei and weak nonmesonic decay has asymmetric angular distribution corresponding parity violation. The magnitude of the parity violation is found to be inconsistent with meson exchange model.
(2) Spin-orbit interaction of ィイD313(/)ΛィエD3C was measured.
Spin-orbit splitting of Λ hypernuclei is known to be small though no definite value has been given by experiments. We produced ィイD313(/)ΛィエD3C by the (KィイD1-ィエD1, πィイD1-ィエD1) using kaon beam provided by the AGS at BNL and measured the splitting by detecting γ rays. The splitting was found to be 20-40 times smaller than that of nucleons.
(3) Production of strangeness by weak interaction.
We are preparing an experiment to measure the inverse reaction (pn → pΛ) of the weak nonmesonic decay. It is a process to produce strangeness by weak interaction. It has never been challenged. We found that the experiment is feasible by carefully designing the detector.

Report

(4 results)
  • 1999 Final Research Report Summary
  • 1998 Annual Research Report
  • 1997 Annual Research Report
  • 1996 Annual Research Report
  • Research Products

    (39 results)

All Other

All Publications (39 results)

  • [Publications] S. Ajimura, M. Ishikawa: "Polarization of ^5_ΛHe Produced by the (π^+, Κ^+) Reaction"Phys. Rev. Lett.. 80. 3471-3474 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] S. Ajimura, M. Ishikawa: "Asymmetry in Nonmesonic Weak Decay of Polarized ^5_ΛHe Hypernucleus"Phys. Rev. Lett.. (in press).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] T. Kishimoto: "Spin orbit splitting of ^<13>_ΛC"Proc. of JLAB sponsored Workshop on Hypernuclear Physics with Electromagnetic Probes December 2-4. (in press). (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] H. Nabetani, T. Oagito, T. Sato, T. Kishimoto: "Spin observation in the pn → pΛ reaction"Phys. Rev.. C60. 017001 1-4 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Tadafumi Kishimoto: "Kaonic nuclei excited by the (Κ^-, Ν) reaction"Phys. Rev. Lett.. 83. 4701-4704 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] T. Kishimoto: "Strangeness Changing Weak Baryon-Baryon Interaction"Nucl. Physics, Proc. of Int. Conf. on "Quark Lepton Neclear Physics" (QULEN 97), Osaka May 1997. A629. 369c-378c (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Tadafumi Kishimoto, Toshi Motoba: "Nuclear Physics with Strange Flavor"Oxford studies in Nuclear Physics, 22, Nuclear-Hadron Many Body Systems Oxford Univ. Press. 41 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] S. Ajimura, M. Ishikawa, K. Ikeda, T. Kishimoto, A. Okusu, N. Shinkai, Y. Tanaka, H. Ejiri, T. Nakano, T. Nagae, H. Noumi, K. Manabe, M. Sekimoto, T. Shibata, O. Hashimoto, K. Maeda, T. Takahashi, T. Hasegawa, H. Bhang, H. Park, Y. Kim, M. Youn, T. Motoba, K. Itonaga: "Polarization of ィイD35(/)ΛィエD3He Produced by the (πィイD1+ィエD1, KィイD1+ィエD1) Reaction"Phys. Rev. Lett.. 80. 3471-3474 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] S. Ajimura, M. Ishikawa, K. Ikeda, T. Kishimoto, A. Okusu, N. Shinkai, Y. Tanaka, H. Ejiri and T. Nakano, T. Nagae, K. Manabe, H. Noumi, M. Sekimoto, and T. Shibata, O. Hashimoto, K. Maeda, and T. Takahashi, T. Hasegawa, H. Bhang, Y. Kim, H. Park, and M. Youn: "Asymmetry in Nonmesonic Weak Decay of Polarized ィイD35(/)ΛィエD3He Hypernucleus"Phys. Rev. Lett.. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] T. Kishimoto: "Spin orbit splitting of ィイD313(/)ΛィエD3C"Proc. of JLAB sponsored Workshop on Hypernuclear Physics with Electromagnetic Probes, December 2-4. (in press). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] H. Nabetani, T. Ogaito, T. Sato, T. Kishimoto: "Spin observables in the pn → pΛ reaction"Phys. Rev.. C60. 017001 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Tadafumi Kishimoto: "Kaonic nuclei excited by the (KィイD1-ィエD1, N) reaction"Phys. Rev. Lett.. 83. 4701 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Tadafumi Kishimoto: "Strangeness changing baryon baryon interaction"Nucl. Phys., Proc. Int. Conf on Quark Lepton Nuclear Physics(QULEN97), Osyaka, 20-23 May, 1997. A629. 369c (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Tadafumi Kishimoto and Toshio Motoba: "Nuclear Physics with Strange Flavour"Oxford studies in Nuclear Physics.22, Nucleon-Hadron Many Body Systems Oxford Univ. Press. 250-291 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] T.Kishimoto: "Strangeness Changing Baryon Baryon Interaction" Nuclear Physics A. 629. 269-378 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] H.C.Bhang: "Lifetimes and Weak-Decay Modes of Lambda Hypernuclei" Nuclear Physics A. 629. 412-415 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] I.G.Bearden: "High Energy Pb+Pb Collisions Viewed by Pion Interferometry" Physical Review C. 58. 1656-1665 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] S.Ajimura: "Polarization of ^5_ΛHe Produced by the (π^+,K^+)Reaction" Physical Review Letters. 80. 3471-3474 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] T.Nagae: "Observation of a^4_ΣHe Bound State in the ^4He(K^-,π^-)Reaction" Physical Review Letters. 80. 1605-1609 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] H.Noumi: "High Intensity Pion Beam Line at JHF" Nuclear Physics A. 639. 121-124 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] T.Nakano: "New Projects at SPring-8 with Multi-GeV Polarized Photons" Nuclear Physics A. 629. 559-566 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] T.Noro: "A Study of Nucleon Properties in Nuclei through (p,2p) Reactions" Nuclear Physics A. 629. 324-333 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] M.Nomachi: "First Experiment at RCNP on p p Bremsstrahlung at 400-MeV" Nuclear Physics A. 629. 213-217 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] G.J.Lolos: "Evidence for ρ^0 Mass Modification in the ^3He(γ,ρ^0)ppn Reaction" Physical Review Letters. 80. 241-244 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] R.Michael: "K^+ Elastic Scattering from C and ^6Li at 715 MeV" Physics Letters B. 382巻・1号. 29-34 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] H.Ejiri: "Limits on Neutrino-less Double Beta Decay of ^<100>Mo" Nuclear Physics A. 611巻・1号. 85-95 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] S.Adler: "Observation of the Decay K^+→π^+μ^+μ^-" Physical Review Letters. 79巻・24号. 4756-4759 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] P.Kitching: "Observation of the Decay K^+→π^+γγ" Physical Review Letters. 79巻・21号. 4079-4082 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] A.J.Simon: "Absolute p-p Elastic Cross-Sections from 492 MeV to 739 MeV Using CH_2 Targets" Physical Review C. 53巻・1号. 30-34 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] K.Hatanaka: "Exclusive Measurement of Proton Quasifree Scattering and Density Dependence of the Nucleon-Nucleon Interaction" Physical Review Letters. 78巻・6号. 1014-1017 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] K.Kaimi: "Multiplicity Dependence of the Pion Source in S+A Collisions at the CERN SPS" Zeitschrift fuer Physik C. 75巻・4号. 619-625 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] I.G.Bearden: "Collective Expansion in High-Energy Heavy Ion Collisions" Physical Review Letters. 78巻・11号. 2080-2083 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] T.Hasegawa: "Spectroscopic Study of ^<10>_ΛB,^<12>_ΛC,^<28>_ΛSi,^<89>_ΛY,^<139>_ΛLa and ^<208>_ΛPb by (π^+,K^+) Reaction" Physical Review C. 53巻・3号. 1210-1220 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] K.Maruyama: "A Step-Like Rise in the ^4He(γ,pn)Cross Section near the Pion-Production Threshold" Physics Letters B. 393巻・3号. 295-300 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] D.G.Watts: "Single and Double Delta Production in the ^3He(γ,π^+π^-)Reaction at 380【less than or equal】Eγ【less than or equal】700 MeV" Physical Review C. 55巻・4号. 1832-1842 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] T.Hasegawa,O.Hashimoto,S.Honma,T.Miyauchi,T.Nagae,M.Sekimoto,T.Shibata,K.Aoki,H.Noumi,H,Boug,M.Youn,Y.Gavrilor,T.Kishimoto他: "Spectroscopic study of ^<10>_ΛB,^<12>_ΛC,^<28>_ΛSi,^<89>_ΛY,^<139>_ΛLa and ^<208>_ΛPb by π^+,K^+ reaction" Physical Review C. 74. 1210-1220 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] R.A.Michael,M.B.Barakat,S.Bart,R.E.Chrien,B.C.Clark,D.J.Errst,S.Honma,K.Hicks,W.Hioton,E.V.Hurguford,T.Kishimoto他: "K^+ elastic scattering from C and ^6Li at 715 MeV/C" Phys.Lett.B. 382. 29-34 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] H.Ejin,K.Fushimi,K.Hayashi,R.Hazama,T.Kishimoto,N.Kudomi,K.Kume,K.Nagata,H.Ohsumi,K.Okada,T.Shime,J.Tanaka: "Limits on neutrino-less double beta decay of ^<100>Mo" Nuclear Physics A. 611. 85 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] E.Choi,H.Ejin,H.Ohsumi,and T.Kishimoto: "Search for Time-Correlated Fast Neutrons from DD Fusion at Room Temperature" Jpn.J.Appl.Phys.35. 2793-2796 (1996)

    • Related Report
      1996 Annual Research Report

URL: 

Published: 1996-04-01   Modified: 2019-02-15  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi