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

Pion Production by Neutron Beam

Research Project

Project/Area Number 10640271
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 素粒子・核・宇宙線
Research InstitutionFukui Medical University

Principal Investigator

TAMURA Keisuke  Fukui Medical University, Physics, Assistant Professor, 物理, 助教授 (30212046)

Co-Investigator(Kenkyū-buntansha) MATSUOKA Nobuyuki  Osaka University, RCNP, Assistant, 物理, 教授 (10030032)
OGAITO Tatoku  Fukui Medical University, Physics, Assistant, 物理, 教授 (70291375)
YOKOO Yoshimatsu  Fukui Medical University, Physics, Professor, 物理, 教授 (10028160)
SAGARA Takeshi  Kyushu University, Dept. of Physics, Assistant Professor, 物理, 教授 (00128026)
Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1999: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1998: ¥900,000 (Direct Cost: ¥900,000)
KeywordsPion / Nucleon-Nucleon / Threshold
Research Abstract

The pion production pn → ppπィイD1-ィエD1 and pp → ppπィイD10ィエD1 were discussed. The theoretical analysis has been performed by using the models of heavy-meson exchange and pion-rescattering including the effect of nucleon resonances. For all the charge channels, the models work well from the near-threshold (s-wave amplitude) to the Δ energy region (p-wave amplitude). The pion-production cross sections are decomposed to four independent isospin amplitudes TィイD2IiIfィエD2 which represents the transition from an initial two nucleon state with isospin IィイD2iィエD2 to a final state with isospin IィイD2fィエD2. The reaction pp → ppπィイD10ィエD1 is characterized by the amplitude TィイD211ィエD2 which is mainly determined by the s-wave ィイD2πィエD2N interaction. Contrary to this, the reaction pn → ppπィイD1-ィエD1 depends on both the s-wave amplitude TィイD211ィエD2 and the p-wave amplitude TィイD201ィエD2. The interference between s- and p-wave causes the forward-backward asymmetry of the differential cross section. The recent works with the chiral perturbation theory predict the s-wave amplitude with the opposite sign to the results of the heavy-meson exchange model and the pion-rescattering model because the s-wave amplitude of the chiral perturbation theory changes its sign when going from on-shell to half-off-shell kinematics. However, the models with opposite sign of s-wave fail to explain the angular dependence of pn → ppπィイD1-ィエD1 reaction. We also discuss about following two topics about πィイD10ィエD1 production. 1) The angular distribution is very sensitive to the short range structure of Δ-excitation mechanism. 2) The measurement of analyzing power suggests that large s-wave amplitude is necessary even at higher energy region.

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] K. Tamura: "Pion production mechanism in nuclear-nucleon collisions"Proceeding of Physics with Storage rings AIP Conference Proceedings. (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K. Tamura: "Pion production mechanism in nuclear-nucleon collisions"Proceeding of XVth Particles and Nuclei Nuclear Physics. (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K. Tamura: "Pion production mechanism in nucleon-nucleon collisions"Proceedings of international symposium on nuclear electro-week spectroscopy. (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K. Tamura: "Pion production mechanism in nucleon-nucleon collisions"Proceedings of XVth particles and Nuclei nuclear Physics A.. to be published. (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K. Tamura: "Pion production mechanism in nucleon-nucleon collisions"Proceedings of physics with storage rings AIP coference proceedings.. to be published. (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K. Tamura: "Pion production mechanism in nucleon-nucleon collisions"Proceedings of Asia-pacific coference on few-body plobles in physics Few-Body Systems.. to be published. (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K. Tamura: "Pion production mechanism in nucleon-nucleon collisions"Proceedings of 16th IUPAP International conference on few-body plobles in physics Nuclear Physics A.. to be published. (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K. Tamura: "Pion production mechanism in nucleon-nucleon collisions"Proceeding of physics with storage rings AIP conference proceedings. (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] K. Tamura: "Pion production mechanism in nucleon-nucleon collisions"Proceeding of XVth particles and Nuclei Nuclear Physics. (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] K.Tamura: "pion production mechanism in nucleon-nucleon collisions" proceedings of International symposium on Nuclear Electro-week spectroscopy. (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] T.Yoshimura et al.: "Alpha spectroscopic factors for 6Li, 7Li, 9Be and 12C" Nuclear Physics A. 641. 3-20 (1998)

    • Related Report
      1998 Annual Research Report

URL: 

Published: 1998-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi