1991 Fiscal Year Annual Research Report

ハイパ-原子核物理の理論的研究

Research Project

Project/Area Number	02044042
Research Institution	Osaka Electro-Communication University
Principal Investigator	元場俊雄大阪電気通信大学, 工学部, 教授 (90121863)
Co-Investigator(Kenkyū-buntansha)	RICHTER O. チェコスロバキア科学アカデミー, 原子核研究所, 助教授 SOTONA M. チェコスロバキア科学アカデミー, 原子核研究所, 教授 MACH R. チェコスロバキア科学アカデミー, 原子核研究所, 教授 MAJLING L. チェコスロバキア科学アカデミー, 原子核研究所, 教授 ZOFKA J. チェコスロバキア科学アカデミー, 原子核研究所, 教授山田泰一高知女子大学, 家政学部, 助手 (70200722) 糸永一憲宮崎医科大学, 教授 (90029546) 若井正道大阪大学, 理学部, 助手 (20028228) 池田清美新潟大学, 理学部, 教授 (40011548) 村岡光男千葉大学, 教養部, 教授 (20028096)
Keywords	ハイパ-原子核 / ストレンジネス / ダブル・ハイパ-核 / 中間子π,Kによる核反応 / 光K生成反応 / 中間子的弱崩壊 / 高エネルギ-重イオン衝突 / ハイペロン核子相互作用
Research Abstract	1.(K^ー,π^ー)と(π^+,K^+)によるp殻ハイパ-核生成反応については,スピン反転相互作用を含む素過程の振幅を用いて,進んだ枠組みの理論計算を実行した.その中で偏極ハイパ-核生成確率を詳しく予測し,初のA^<12>C実験デ-タを比較検討した.また,スピン反転成分の大きな(γ,K^+)反応についても,単純配位だけでなく混合配位での解析を行った.現在論文としてまとめている. 2.特に軽いAおよびΛΛハイパ-核(質量数A=3〜6)の崩壊における3体連続終状態に対してカッパ-・パイエルス法を適用し現実的スペクトルを算出し,実験値に比較し得る理論崩壊確率を得た. 3.軽いハイパ-核(Σ ^4He,Σ ^7LiやΛ ^7Liなど)の高魅起状態を含めて,クラスタ-模型と殻模型の双方からの解析を行い,Σ原子の結果やYNG有効相互作用の性質を踏まえた多面的検討が進んだ.特にΣハイパ-核ではスピンアイソスピン相関の役割が明らかにした. 4.Ξ粒子の吸収によるダブルΛ複合核生成および破砕より,各種のハイパ-核が生成される過程について理論モデルに基づく計算を行い,それぞれの生成確率を予測した.特に軽いダブルΛハイパ-核の生成分布は,高エネルギ-研究所での実験(E176,E224)で注目されよう. 5.高エネルギ-研究所で発見されたダブルΛハイパ-核の事象と関係してΛーΛ相互作用の性質を検討した.

Research Products
(17 results)

All Other

All Publications (17 results)

[Publications] T.Motoba: "Pionic Decay of Light to Heavy Hypernuclei," Nucl.Phys.A527. 485C-488C (1991)
[Publications] T.Motoba: "(π,K) Production of Hypernuclei and Pionic Decay," AIP Conf.Proc.No.224,Particles and Fields. 43. 115-127 (1991)
[Publications] K.Itonaga: "Polarization in p-Shell Λ-Hypernuclear Productions," Few Body Systems,Suppl.(1992)
[Publications] T.Motoba: "Mesonic Weak Decays of Light Hypertnuclei," Few Body Systems,Suppl.(1992)
[Publications] T.Motoba: "Continuum Pion Spectra in the Weak Decays of ^4_ΛH, ^5_ΛHe and ^6_<ΛΛ>He," Nucl.Phys.A534. 597-619 (1991)
[Publications] M.Sotona: "Production of Polarized Hypernuclei -Photoproduction versus (π,K) and (K,π) Reactions-" Nucl.Phys.(1992)
[Publications] T.Motoba: "Mesonic weak Decays of Λ- and ΛΛ-Hypernuclei," Nucl.Phys A. (1992)
[Publications] K.Itonaga: "Hypernuclear and Λ-Spin Polarizations in the (π^+,K^+) and (K^-,π^-) Reactions," Nucl.Phys.A. (1992)
[Publications] M.Sano: "Formation and Fragmentation of Double-Λ Compound Nucleus," Prog.Theor.Phys.(1992)
[Publications] Y.Yamamoto: "Formation Of Double-Λ Hyperenucleus from Quasi-Free Ξ^- Absorption," Nucl.Phys.A. (1992)
[Publications] M.Wakai: "Energy Dependence of Hypernucleus Production in High-Energy Nuclear Collision," Nucl.Phys.A. (1992)
[Publications] T.Yamada: "Σ-Atoms and ^4_ΣHe Hypernucleus with the Nijmegen OBE Potentials," Proc.5th Int.Symp.on Mesons and Light Nuclei (Prague,September 1991),Few Body Systems,Suppl.(1992)
[Publications] T.Yamada: "Possible Existence of a ^7_ΣLi Bound State," Nucl.Phys.(1992)
[Publications] T.Yamada: "Low-Lying Alpha-Cluster States with Core Excitation in the ^4Ti Nucleus" Phys.Rev.
[Publications] T.Yamada: " ^4_ΣHe Hypernuclear States and Roles of the Spin-Isospin Terms of Σ-N Interaction," Prog.Theor.Phys.
[Publications] T.Yamada: "Possible Existence of a Bound State in ^7_ΣLi," Phys.Rev.
[Publications] O.Richter: "Realistic A=7 Hypernuclear Production" Phys.Rev.C43. 2753-2764 (1991)

1991 Fiscal Year Annual Research Report

ハイパ-原子核物理の理論的研究

Principal Investigator

元場 俊雄 大阪電気通信大学, 工学部, 教授 (90121863)

Research Products

[Publications] T.Motoba: "Pionic Decay of Light to Heavy Hypernuclei," Nucl.Phys.A527. 485C-488C (1991)

[Publications] T.Motoba: "(π,K) Production of Hypernuclei and Pionic Decay," AIP Conf.Proc.No.224,Particles and Fields. 43. 115-127 (1991)

[Publications] K.Itonaga: "Polarization in p-Shell Λ-Hypernuclear Productions," Few Body Systems,Suppl.(1992)

[Publications] T.Motoba: "Mesonic Weak Decays of Light Hypertnuclei," Few Body Systems,Suppl.(1992)

[Publications] T.Motoba: "Continuum Pion Spectra in the Weak Decays of ^4_ΛH, ^5_ΛHe and ^6_<ΛΛ>He," Nucl.Phys.A534. 597-619 (1991)

[Publications] M.Sotona: "Production of Polarized Hypernuclei -Photoproduction versus (π,K) and (K,π) Reactions-" Nucl.Phys.(1992)

[Publications] T.Motoba: "Mesonic weak Decays of Λ- and ΛΛ-Hypernuclei," Nucl.Phys A. (1992)

[Publications] K.Itonaga: "Hypernuclear and Λ-Spin Polarizations in the (π^+,K^+) and (K^-,π^-) Reactions," Nucl.Phys.A. (1992)

[Publications] M.Sano: "Formation and Fragmentation of Double-Λ Compound Nucleus," Prog.Theor.Phys.(1992)

[Publications] Y.Yamamoto: "Formation Of Double-Λ Hyperenucleus from Quasi-Free Ξ^- Absorption," Nucl.Phys.A. (1992)

[Publications] M.Wakai: "Energy Dependence of Hypernucleus Production in High-Energy Nuclear Collision," Nucl.Phys.A. (1992)

[Publications] T.Yamada: "Σ-Atoms and ^4_ΣHe Hypernucleus with the Nijmegen OBE Potentials," Proc.5th Int.Symp.on Mesons and Light Nuclei (Prague,September 1991),Few Body Systems,Suppl.(1992)

[Publications] T.Yamada: "Possible Existence of a ^7_ΣLi Bound State," Nucl.Phys.(1992)

[Publications] T.Yamada: "Low-Lying Alpha-Cluster States with Core Excitation in the ^4Ti Nucleus" Phys.Rev.

[Publications] T.Yamada: " ^4_ΣHe Hypernuclear States and Roles of the Spin-Isospin Terms of Σ-N Interaction," Prog.Theor.Phys.

[Publications] T.Yamada: "Possible Existence of a Bound State in ^7_ΣLi," Phys.Rev.

[Publications] O.Richter: "Realistic A=7 Hypernuclear Production" Phys.Rev.C43. 2753-2764 (1991)

元場俊雄大阪電気通信大学, 工学部, 教授 (90121863)