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Nuclear structure from photo <pi^-> production on nuclei

Research Project

Project/Area Number 60540165
Research Category

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

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

Principal Investigator

SHODA Katsufusa  Tohoku University, fuculty of Science , Professor, 理学部, 教授 (40004262)

Co-Investigator(Kenkyū-buntansha) TSUBOTA Hiroaki  Tohoku University, College of General Education , Asistant Professor, 教養部, 助教授 (70005792)
Project Period (FY) 1985 – 1986
Project Status Completed (Fiscal Year 1986)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1986: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1985: ¥1,200,000 (Direct Cost: ¥1,200,000)
KeywordsNegative charge <pi> -meson / Photoproduction / Residual nuclear states / Angular distribution of <pi^-> / 原子核構造
Research Abstract

Our group have studied for ( <gamma> , <pi^+> ) reactions on various nuclei since the first publication on angular distribution of photoproduced <pi^+> from <^(12)C> by our group. For ( <gamma> , <pi^-> ) reaction, backgrounds are strong, but we found a possibility for this reaction and have been preparing experiments since 1984. After a little improvement, we completed experiments on <^(13)C> (e, <pi^-> ) and changed the detector from SSD system to MWPC and back counters with a part of the Grant-in aid for Scientific Research. The charcter of this new system has been studied in 1986 and then applied for <^(15)N> (e, <pi^-> ).
The nuclear transitions with <P_(1/2)> <-!>> <P_(1/2)> as for <^(13)C> ( <gamma> , <pi^-> ) <^(13)N_g.s.> and <^(15)N> ( <gamma> , <pi^-> ) <^(15)O_g.s.> show particular interests on a strong contribution of a higher order spin-dependent term in addition to the spin term (Krol Ruderman term) which is always strong, and also on a comparable E0 component which is interesting for nuclear structure study. These two reactions have been measured with <^(13)C> (e, <pi^-> ) and <^(15)N> (e, <pi^-> ) reactions, and the results are used for the derivation of ( <gamma> , <pi^-> ) angular distributions.
The experimental results are compared with the theoretical estimates which have been obtained with active discussions between the theorist and our group members supported by the Grant. For <^(13)C> , the angular distributions are well explained by the theory if we negrect the E0 contribution which concerns <DELTA> effect in nuclei. For <^(15)N> , a large disagreement is found between experimental and theoretical studies. This disagreement should be important, so we are planning further theoretical calculations and experimental confirmation.

Report

(1 results)
  • 1986 Final Research Report Summary
  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] K.Shoda et al.: Physics Letters. 169B. 17-20 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 小林毅範 他: 核理研 研究報告. 19. 224-232 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] T.Kobayashi et.al.: Abstract of 【XI】 International Conference on Particles and Nuclei(PANIC'87)Kyoto,1987.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] K. Shoda et al.: "Angular distribution of <pi^-> produced from <^(13)C> ( <gamma> , <pi^-> ) <^(13)N_g.s.> by 163 MeV electron" Contributed paper to Nuclear Physics with Electromagnetic Probes, Paris, 1985. 202-203 (1985)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] K. Shoda et al.: "Contribution of M1 and E0 Transitions in <^(13)C> ( <gamma> , <pi^-> ) <^(13)N_g.s.> in the Threshold Region" Physics Letters. 169 B. 17-20 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] T. Kobayashi et al.: "Study of <^(15)N> ( <gamma> , <pi^-> ) <^(15)O_g.s.> " Research Report of Laboratory of Nuclear Science, Tohoku University. 19. 224-232 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] T. Kobayashi et al.: "Contribution of M1 and E0 transitions in the <^(15)N> ( <gamma> , <pi^-> ) <^(15)O_g.s.> in the threshold region" Abstruct of XI International Conference on Particles and Nuclei (PANIC'87). (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary

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Published: 1987-03-31   Modified: 2016-04-21  

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