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Three- and four-body study of light hypernuclei and YN interaction

Research Project

Project/Area Number 11640283
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 InstitutionKYUSHU UNIVERSITY

Principal Investigator

KAMIMURA Masayasu  Kyushu University, Department of Physics, Professor, 理学研究院, 教授 (10037210)

Co-Investigator(Kenkyū-buntansha) HIYAMA Emiko  High Energy Accelerator Research Organization, Institute of Particle and nuclear Study, Research Assistant, 高エネルギー加速器研究機構・素粒子原子核研究所, 助手 (10311359)
Project Period (FY) 1999 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 2001: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2000: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1999: ¥1,100,000 (Direct Cost: ¥1,100,000)
Keywordshypemuclei / hypenon / strangeness / 3-body problem / 4-body problem / Λ particle / ハイペロン-核子相互作用 / スピン軌道力 / ガンマー線分光 / 3体・4体問題 / ガウス型基底関数
Research Abstract

[1] Theoretical prediction of B(E2) in hypemuclei.
We calculated B(E2: 5/2^+_1 → 1/^+_1) in ^7_λLi and B(E2: 3^+_1→1^+_1) of the core nucleus ^6_λLi. From their comparison, we predicted that size of ^7_λLi is shrunk by 21% from the core nucleus. KEK-E419 experiment verified this prediction.
[2] YN spin-orbit force and the level structure of ^9_λBe and ^13_λ3C.
With the use of the two kinds of YN interactions we calculated energy splitting in the spin orbit doublet in ^9_λBe and ^13_λ3C. The quark-model-based interaction gave very small splitting, where as the meson-theory- based interaction gave substantially large splitting. Experiments at BNL reported a small splitting which agrees with the former case of our prediction.
[3] Four-body study of ^4_λH and ^4_λHe.
We performed, for the first time, four-body calculation of ^4_λH and ^4_λHe with the explicit use of the (3Ν+Λ) and (3Ν+Σ) channel. The ΛΝ-Σ coupling is treated accurately. We were able to explain the level structure of the hypemuclei and estimated the probability of the (3Ν+Σ) channel. It is 2% in the 0^+ state and 1% in the 1^+ state, but plays important role in making the states bound.
[4] Spectroscopy of the double-Λ hypemuclei.
We predicted the energy levels of the A=7-10 double-Λ hypemuclei with the use of the α+χ+Λ+Λ four-body model with χ= n,p,t,^3He,α. Our prediction for 2^+ state of ^<10>_<ΛΛ>Be was recently verified by the DEMACHI-YANAGI event in the KEK-E373 experiment.

Report

(4 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • 1999 Annual Research Report
  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] E.Hiyama: "Λ-Σ conversion in ^4_ΛH and ^4_ΛHe based on four-body calcuation"Physical Review. C64. 11301-11301 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] E.Hiyama: "Three-and Four-Body Structure of Light Hypernuclei"Nuclear Physics. A691. 107-107 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] E.Hiyama: "Three-and four-body structure of light Λ hypernuclei"Nuclear Physics. A684. 227c-227c (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] E.Hiyama: "ΛN spin-orbit splittings in ^9_ΛBe and ^<13>_ΛC studied with one-boson"Physical Review Letters. 85. 270-270 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] E. Hiyama, M. Kamimura, T. Motoba, T. Yamada and Y. Yamamoto: "Λ-Σ conversion in ^4_ΛH and ^4_Λhe based on four-body calculation"Physical Review. C64. 11301 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] E. Hiyama, M. Kamimura, T. Motoba, T. Yamada and Y. Yamamoto: "Three- and Four-Body Structure of Light Hypernuclei"Nuclear Physics. A691. 107c (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] E. Hiyama, M. Kamimura, T. Motoba, T. Yamada and Y. Yamamoto: "Three- and four-body structure of light Λ hypernuclei"Nuclear Physics. A684. 227c (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] E. Hiyama, M. Kamimura, T. Motoba, T. Yamada and Y. Yamamoto: "ΛΝ spin-orbit splittings in ^9_Λbe and ^<13>_ΛC studied with one-boson"Physical Review Letters. 85 No.1. 270 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] E.Hiyama: "Λ-Σ conversion in ^4_ΛH and ^4_ΛHe based on four-body"Physical Review C. 64(1). 11301-1-11301-5 (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] E.Hiyama: "Three-and four-body structure of light Λ hypernuclei"Nuclear Physics A. 691(1). 107c-110c (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] E.Hiyama: "Three-and four-body structure of light hypernuclei"Nuclear Physics A. 684(1). 227c-232c (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] E.Hiyama: "Lambda N Spin-Orbit Splitting in 9Be-Lambda and 13C-Lambda Studied with One-Boson-Exchange Lambda-N Interactions"Physical Review Letters. 85・2. 270-273 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] K.Suzuki: "Roles of Quark-Pair Correlations in Baryon Structure and Non-Leptonic Weak Transitions of Hyperons"Few-Body Systems. Supplement 12. 209-213 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] E.Hiyama: "Four-Body calculations of 4H-Lambda and 4He-Lambda with Sigma N-Lambda N conversion"Few-Body Systems. Supplement 12. 347-352 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] R.A.D Piyadasa: "Convergence of the solution of the continuum discretized coupled channels method"Physical Review. C60・4. 044611-1-044611-9 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] E.Hiyama: "Four-body calculation of 4H-lambda 4He-lambda with sigma N-lambda Nconversion"Few Body Systems Supplement. (印刷中). (2000)

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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