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Precision gamma spectroscopy of hypernuclei

Research Project

Project/Area Number 11440070
Research Category

Grant-in-Aid for Scientific Research (B)

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

Principal Investigator

TAMURA Hirokazu  Tohoku Univ., Dept. of Physics, Associate Professor, 大学院・理学研究科, 助教授 (10192642)

Co-Investigator(Kenkyū-buntansha) TAKAHASHI Toshiyuki  Tohoku Univ., Dept. of Physics, Research Associate, 大学院・理学研究科, 助手 (50281960)
FUJII Yu  Tohoku Univ., Dept. of Physics, Research Associate, 大学院・理学研究科, 助手 (30302079)
MEDA Kazushige  Tohoku Univ., Dept. of Physics, Associate Professor, 大学院・理学研究科, 助教授 (20125652)
OUTA Haruhiko  KEK, Inst. for Particle and Nuclear Study, Research Associate, 素粒子原子核研究所, 助手 (60221818)
Project Period (FY) 1999 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥14,700,000 (Direct Cost: ¥14,700,000)
Fiscal Year 2001: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 2000: ¥7,200,000 (Direct Cost: ¥7,200,000)
Fiscal Year 1999: ¥5,500,000 (Direct Cost: ¥5,500,000)
Keywordshypernucleus / Λ particle / γ-ray spectroscopy / germanium detecter / Λ-nucleon interaction / spin-orbit interaction / tensor interaction / (Kiπ^-) reaction / ∧・核子相互作用 / ハイパーフラグメント / Λ核子相互作用 / Λのスピン軌道相互作用 / 遷移確率
Research Abstract

The purpose of this research is to investigate detailed level structure of various light Λ hypernuclei by precision γ spectroscopy with our germanium detector array, Hyperball. In particular, we aim at extracting strengths of all the spin-dependent interactions (spin-spin, spin-orbit and tensor interactions) between a Λ and a nucleon from hypernuclear level structure. This purpose has been well accomplished as follows.
1. We finished data analysis of the experiment KEK E419 carried out in 1998, where we succeeded in observing four γ transitions in ^7_ΛLi and we measured B(E2). We established the strength of the ΛN spin-spin force and confirmed the hypernuclear shrinking effect.
2. Since 1998, we have performed a series of experiments (BNL E930) at Brookhaven National Laboratory using (K^-,π^-) reaction with the AGS D6 beamline and Hyperball. For the ^9Be target data, we finished data analysis and succeeded in separately observing closely-located two γ-ray peaks at 3 MeV, which indicated a hypernuclear fine structure (3/2^+, 5/2^+) in ^9_ΛBe having only 31 keV level spacing. This spacing gives a very small spin-orbit force of Λ, which cannot be explained by meson-exchange models of baryon-baryon interactions but is consistent with quark models.
3. We improved various detectors of Hyperball and the D6 spectrometer in 2000-2001, and then performed next E930 runs with ^<16>O and ^<10>B targets in the fall in 2001. Although the data analysis is preliminary, we have observed ^<16>_ΛOγrays (1^-→1^-,0^-) at 6.55 MeV. From the level spacing of the (1^-,0^-) doublet, the strength of the ΛN tensor force will be extracted. We also observed three γ transitions in ^<15>_ΛN produced from ^<16>_ΛO excited states by proton emission. From ^<10>B target data, we have not observed the ^<10>_ΛBγ rays but observed several γ rays from various hyperfragments from highly excited states of ^<16>_ΛO.

Report

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

    (62 results)

All Other

All Publications (62 results)

  • [Publications] H.Tamura et al.: "High-resolution gamma-ray spectroscopy of ^7_ΛLi"Nuclear Physics A. 670. 249-256 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H.Tamura: "Future Plans of High-Resolution Hypernuclear Gamma-Spectroscopy"Strangeness Nuclear Physics (Ed. Il-T.Choen, S.W.Hong, and T.Motoba, World Scientific). 411-418 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] K.Tanida et al.: "Hypernuclear Gamma-Ray Spectroscopy Experiments with Germanium Detectors"Strangeness Nuclear Physics (Ed. Il-T.Choen, S.W.Hong, and T.Motoba, World Scientific). 98-103 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H.Tamura et al.: "High-resolution hypernuclear gamma-ray spectroscopy"Nuclear Physics A. 663&664. 481-484 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H.Tamura et al.: "High-resolution gamma-ray spectroscopy of ^7_ΛLi and ^9_ΛBe"Few-Body Systems Supplement. 12. 342-346 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H.Tamura et al.: "Observation of a spin-flip M1 transition in ^7_ΛLi"Physical Review Letters. 84. 5963-5966 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] K.Tanida et al.: "High-Resolution Gamma-Ray Spectroscopy of Hypernuclei with Germanium Detectors"Nuclear Physics A. 684. 560-562 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H.Tamura: "Hypernuclear physics with hadronic beams"Proc. Workshop on "Hyeprnuclear Physics with Hadronic Probes" (Ed. L.Tang and O.Hashimoto, Hampton University). 63-78 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H.Tamura: "Hypernuclearγspectroscopy --recent results with Hyperball"Hadrons, Nuclei and Applications (Ed. G.C.Bonsignori et al.,World Scientific). 106-109 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H.Tamura: "High resolution spectroscopy of Λ hypernuclei : present status and perspectives"Nuclear Physics A. 691. 86-92 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] K.Tanida et al.: "High-resolution gamma-ray spectroscopy of ^7_ΛLi"Nuclear Physics A. 691. 115-118 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H.Akikawa et al.: "γ-ray spectroscopy of ^9_ΛBe"Nuclear Physics A. 691. 134-137 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] K.Tanida et al.: "Measurement of B(E2) of ^7_ΛLi and shrinkage of the hypernuclear size"Physical Review Letters. 86. 1982-1985 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H.Tamura: "Hypernuclear Studies at KEK and BNL : γSpectroscopy of Λ Hypernuclei"Hirschegg '01 Structure of Hadrons. 290-299 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 田村裕和, 谷田聖: "ハイパー核ガンマ線分光学の幕開け"日本物理学会誌. 56. 419-422 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 田村裕和: "縮む奇妙な原子核--原子核の概念を拡張するハイパー核"科学(岩波書店). 71. 1013-1015 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H.Tamura: "Hypernuclear γ spectroscopy and ΛN interactions"Hadrons and Nuclei (Ed. Il-T.〜Cheon et al., American Institute of Physics). 147-154 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H.Akikawa et al.: "Hypernuclear Fine Structure in ^9_ΛBe"Physical Review Letters. 88. 082501-1-082501-4 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H.Tamura: "Impurity Nuclear Physics--Hypernuclear γ Spectroscopy and future plans for neutron-rich hypernuclei"European Physical Journal A. 13. 181-187 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 田村裕和: "ハイパー核とバリオン間相互作用"原子核研究. 46-4. 1-30 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H.Tamura: "Structure of Light Hypernuclei Studied by Gamma-Ray Spectroscopy"Clustering Aspects of Quantum Many-Body Systems (Ed. A.Ohnishi et al., World Scientific). (in Press). (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Tamura et al.: ""High-resolution gamma-ray spectroscopy of ^7_ΛLi""Nucl. Phys. A.. 670. 249c-256c (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Tamura: ""Future Plans of High-Resolution Hypernuclear Gamma-Spectroscopy"""Strangeness Nuclear Physics" Ed. Il-T. Choen et al., World Scientific. 411-418 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] K. Tanida et al.: ""Hypernuclear Gamma-Ray Spectroscopy Experiments with Germanium Detectors"""Strangeness Nuclear Physics" Ed. Il-T. Choen et al., World Scientific. 98-103 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Tamura et al.: ""High-resolution hypernuclear gamma-ray spectroscopy""Nucl. Phys. A.. 663&664. 481c-484c (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Tamura et al.: ""High-resolution gamma-ray spectroscopy of ^7_ΛLi and ^9_ΛBe""Few-Body Systems Suppl.. 12. 342-346 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Tamura et al.: ""Observation of a spin-flip M1 transition in ^7_ΛLi""Phys. Rev. Lett.. 84. 5963-5966 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] K. Tanida et al.: ""High-Resolution Gamma-Ray Spectroscopy of Hypernuclei with Germanium Detectors""Nucl. Phys. A.. 684. 560c-562c (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Tamura: ""Hypernuclear physics with hadronic beams""Proc. Workshop on "Hypernuclear Physics with Hadronic Probes" Ed. L. Tang and O. Hashimoto Hampton University. 63-78

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Tamura: ""Hypernuclear γ spectroscopy - recent results with Hyperball"""Hadrons, Nuclei and Applications", Ed. G.C. Bonsignori et al., World Scientific. 106-109

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Tamura: ""High resolution spectroscopy of Λ hypernuclei: present status and perspectives""Nucl. Phys. A.. 691. 86c-92c (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] K. Tanida et al.: ""High-resolution gamma-ray spectroscopy of ^7_ΛLi""Nucl. Phys. A.. 691. 115c-118c (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Akikawa et al.: ""γ-ray spectroscopy of ^9_ΛBe""Nucl. Phys. A.. 691. 134c-137c (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] K. Tanida et al.: ""Measurement of B(E2) of ^7_ΛLi and shrinkage of the hypernuclear size""Phys. Rev. Lett.. 86. 1982-1985 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Tamura: ""Hypernuclear Studies at KEK and BNL: Gamma Spectroscopy of Λ Hypernuclei"""Hirschegg '01, Structure of Hadrons". 290-299 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Tamura, K. Tanida: ""Origination of Hypernuclear γ Spectroscopy""Butsuri. 56. 419-422 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Tamura: ""Shrinking Strange Nucleus - Hypernuclei extending our concept on atomic nuclei""Kagaku. 71. 1013-1015 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Tamura: ""Hypernuclear γ spectroscopy and ΛN interactions"""Hadrons and Nuclei", Ed. Il-T, Cheon et al. American Institute of Physics. 147-154

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Akikawa et al.: ""Hypernuclear Fine Structure in ^9_ΛBe""Phys. Rev. Lett.. 88. 082501-1-4 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Tamura: ""Impurity Nuclear Physics - Hypernuclear gamma spectroscopy and future plans for neutron-rich hypernuclei""Eur. Phys. J.A.. 13. 181-187 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Tamura: ""Hypernuclei and Baryon-Baryon Interactions""Geshikaku Kenkyu. 46 No. 4. 1-30 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Tamura: ""Structure of Light Hypernuclei Studied by Gamma-Ray Spectroscopy"""Clustering Aspects of Quantum Many-Body Systems" World Scientific. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] K.Tanida et al.: "Measurement of B(E2)of ∧^^7Li and shrinkage of hypernuclear size"Phys, Rev. Lett.. 86. 1982-1985 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Akikawa et al.: "Hypernuclear fine structure in ∧^^9Be"Phys. Rev. Lett.. 88. 082501-0825014 (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Tamura: "High-resolution gamma spectroscopy of ∧ hypernuclei : present status and perspectives"Nucl. Phys. A. 691. 86-92 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] K.Tanida et al.: "High-resolution γ spectroscopy of ∧^^7 Li"Nucl. Phys. A. 691. 115-118 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Akikawa et al.: "γ-ray spectroscopy of ∧^^9Be"Nucl. Phys. A. 691. 134-137 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Tamura: "Hypernuclear Studies at KEK and BNL : Gamma spectroscopy of ∧ hypernuclei"Proceedings of 1nt. Workshop on"Structure of Hadrons". 290-299 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Tamura: "Hypernuclear γ spectroscopy and ΛN interactions"Proceedings of 1nt. Symp. on"Hadrons and Nuclei. 147-154 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 田村裕和他: "ハイパー核ガンマ線分光学の幕開け"日本物理学会誌. 56. 419-422 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 田村裕和: "縮む「奇妙な」原子核-原子核の概念を拡張するハイパー核"科学(岩波書店). 71. 1013-1015 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Tamura: "Impurity Nuclear Physics"Eur. Phys. J. A. (印刷中).

    • Related Report
      2001 Annual Research Report
  • [Publications] H,Tamura et al.: "Observation of a spin-flip MI transition in ^7_ΛLi"Physical Review Letters. 84. 5963-5966 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] K,Tanida et al.: "Measurement of B(E2) of ^7_ΛLi and shrinkage of the hypernuclear size"Physical Review Letters. 86(印刷中). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] H,Tamura et al.: "High-resolution gamma-ray spectroscopy of ^7_ΛLi"Nuclear Physics A. 670. 249-256 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] H,Tamura et al.: "High-resolution hypernuclear gamma-ray spectroscopy"Nuclear Physics A. 663. 481-484 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] H,Tamura et al.: "High-resolution gamma-ray spectroscopy of ^7_ΛLi and ^9_∧Be"Few-Body Systems Suppl.. 12. 342-346 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] H.Tamura: "High-Resolution Spectroscopy of Λ Hypernuclei : Present Status and Perspectives"Nuclear Physics A. (印刷中).

    • Related Report
      2000 Annual Research Report
  • [Publications] H.Tamura et al.: "High-Resolution Gamma-Ray Spectroscopy of ^Λ_7Li"Nuclear Physics A. (印刷中).

    • Related Report
      1999 Annual Research Report
  • [Publications] H.Tamura: "Future Plans of High-Resolution Hypernuclear Gamma-Spectroscopy"Proc. APCTP Workship on Strangeness Nudear Physics (World Scientific). (印刷中).

    • Related Report
      1999 Annual Research Report
  • [Publications] H.Tamura et al.: "High-resolution hypernuclear gamma-ray Spectroscopy"Nuclear Physics A. (印刷中).

    • Related Report
      1999 Annual Research Report
  • [Publications] H.Tamura et al.: "High-resolution gamma-ray spectroscopy of ^Λ_7Li and ^Λ_9Be"Proc. Asia-Pacific Conf. On Few Body Problems in Physics. (印刷中).

    • Related Report
      1999 Annual Research Report

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

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