1999 Fiscal Year Annual Research Report

核内非核子自由度の核物質密度依存性

Research Project

Project/Area Number	09304032
Research Institution	Osaka University
Principal Investigator	南園忠則大阪大学, 大学院・理学研究科, 教授 (20028210)
Co-Investigator(Kenkyū-buntansha)	福田光順大阪大学, 大学院・理学研究科, 助教授 (50218939) 松多健策大阪大学, 大学院・理学研究科, 助教授 (50181722) 野尻洋一高知工科大学, 工学部, 教授 (90028233) 越桐國雄大阪教育大学, 教育学部, 教授 (90153527) 佐川弘幸会津大学, 理学部, 教授 (50178589)
Keywords	核内非核子自由度 / 弱核子流誘導テンソル項 / 擬ベクトル流の時間成分 / 核子密度分布 / 核モーメント / ベータNMR法 / ベータ線角度分布 / 短寿命ベータ放射性核
Research Abstract	不安定原子核の核スピン偏極法やスピンアンサンブルのコントロール技術を開発し、偏極不安定核ビーム技術を確立した。この技術を活用して、不安定核の核磁気モーメントや電気四重極モーメント、鏡映核ベータ崩壊における弱核子流の誘導テンソル項と擬ベクトル流の時間成分(アキシャルチャージ)を決定し、原子核内での核子、メソンやクォークのダイナミクスの解明を計った。また、これらのダイナミクスと核子密度との関係を調べるため、相互作用断面積や電気四重極モーメントを精密測定した。成果は以下のようにまとめられる。 1)偏極不安定核ビーム技術確率のために、高エネルギー入射核破砕過程や低エネルギー核子移行反応における、^<8,12>B,^9C,^<12,16>N,^<13,19>O,^<20,21>F,^<27>Si,^<39>Caの核偏極度の実験と系統的な解析から核スピン偏極機構が明らかになった。 2)新核四重極共鳴法を用いて、^<12,16>N,^<13,19>O,^<21>F,^<27>Si,^<39>Caの電気四重極モーメントを測定した。その結果、これらの核の核子密度分布が明らかになった。実験に必要な結晶中の電場勾配(EFG)をKKR法による電子バンド計算により系統的に研究し、またTi^<17>O_2を合成し、^<17>OのFT-NMRから結晶内電場勾配を実験的に決定した。 3)極端な陽子過剰核^9Cや^<13>Oの核モーメントの精密値から、^9Cのスピン期待値が異常に大きい事を明らかにした。これは、従来のモデルでは説明出来ず、クォークの閉じこめ機構に関わるg-因子の再規格化が核内で起こっている可能性を示す。 4)新スピンコントロール法に基づいて、核整列相関項の精密測定を開始した。質量数12体系(^<12>B,^<12>N)ベータ崩壊におけるG-Parityの破れの上限を更新中である。また、非常に大きなアキシャルチャージが観測され、核子質量が核内で軽くなる再規格化が起こっている事が明らかになった。

Research Products

(18 results)

All Other

All Publications (18 results)

[Publications] 南園啓他: "G-Parity Violation of Weak Nucleon Current and In-Medium Mass Renormalization of Nucleons Detected through the β Decays of Spin Aligned ^<12>B and ^<12>N"Nuclear Physics. (2000)
[Publications] 南園啓他: "New Limit of the G-Parity Irregular Induced Tensor Current and of the Axial Charge in Weak Nucleon Current Detected in Alignment Terms of^<12>B and ^<12>Nβ Decays"Nuclear Physics. A654. 955c-960c (1999)
[Publications] 南園忠則他: "In-Medium Mass Renormalization of Nucleons Detected in the Axial Charges of the Beta-Decays of Spin Aligned ^<12>B and ^<12>N"Physical Review Letters. 82. 1644-1647 (1999)
[Publications] 山口貴之他: "Spin Control of ^<12>B and ^<12>N and Axial Charge from their β-Ray Spin-Alignment Correlations"Hyperfine Interactions. 120/121. 701-705 (1999)
[Publications] 松多健策他: "Electromagnetic Moments of Short Lived β Emitters ^<21>F,^<23>Mg,^<27>Si, and^<39>Ca"Hyperfine Interactions. 120/121. 673-677 (1999)
[Publications] 佐藤和則他: "Hyperfine Interactions of ^<19>O in TiO_2 and Quadrupole Moments of ^<13,19>O"Hyperfine Interactions. 120/121. 661-665 (1999)
[Publications] 佐藤和則他: "Quadrupole Moments of Short-Lived β-Emitters ^<13,19>O and ^<21>F"Nuclear Physics. A654. 735c-738c (1999)
[Publications] 南園忠則他: "Electromagnetic Moments of β-Emitting Nucleus ^<19>O"Physics Letters. B459. 81-85 (1999)
[Publications] 松多健策他: "Quadrupole Moment of the Proton Drip-Line Nuclei ^<13>O"Physics Letters. B459. 81-85 (1999)
[Publications] 福田光順他: "Density Distribution of ^8B Studied via Reaction Cross Sections"Nuclear Physics. A656. 209-228 (1999)
[Publications] 南園忠則他: "New Limit of the G-Parity Irregular Weak Nucleon Current Disclosed in β-Ray Angular Distributions from Spin Aligned ^<12>B and ^<12>N"Physical Review Letters. 80. 4132-4135 (1998)
[Publications] 南園忠則他: "Interdisciplinary Regions of Nuclear Phyusics Studied by use of Spin-Polarized Short-Lived Nuclei"Nuclear Instrument and Methods in Physics Reaearch. A402. 218-223 (1998)
[Publications] 松多健策他: "Creation of Spin Polarization in Unstable Nuclei and Correlation-Type Experiments"Nuclear Instrument and Methods in Physics Reaearch. A402. 229-235 (1998)
[Publications] 南園忠則他: "Quadrupole Moment of the Proton Rich β-Emitting Nucleus ^<12>N"Pyhsics Letters. B420. 31-36 (1998)
[Publications] 南園忠則他: "Electric Quadrupole Interactions of Short-Lived β-Emitter ^<12>N in Insulator Crystals (^<12>N implanted in Single Crystal TiO_2)"Z. Naturforsh.. 53a. 293-300 (1998)
[Publications] 福田光順他: "Reaction Cross Sections Measured for ^8B to Obtain Its Density Distribution"短寿命核ビームの科学'96,KEK Proceedings 97-10. 162-163 (1997)
[Publications] 三原基嗣他: "Momentum Distribution of ^7Be Produced through ^8B Fragmentation"短寿命核ビームの科学'96,KEK Proceedings 97-10. 164-166 (1997)
[Publications] 南園忠則、野尻洋一、松多健策、佐藤透: "Non-Nulceonic Degrees of Freedom Detected in Nuclei"World Scientific Publishing Co.. 414 (1997)

1999 Fiscal Year Annual Research Report

核内非核子自由度の核物質密度依存性

Principal Investigator

南園 忠則 大阪大学, 大学院・理学研究科, 教授 (20028210)

Research Products

[Publications] 南園 啓 他: "G-Parity Violation of Weak Nucleon Current and In-Medium Mass Renormalization of Nucleons Detected through the β Decays of Spin Aligned ^<12>B and ^<12>N"Nuclear Physics. (2000)

[Publications] 南園 啓 他: "New Limit of the G-Parity Irregular Induced Tensor Current and of the Axial Charge in Weak Nucleon Current Detected in Alignment Terms of^<12>B and ^<12>Nβ Decays"Nuclear Physics. A654. 955c-960c (1999)

[Publications] 南園忠則 他: "In-Medium Mass Renormalization of Nucleons Detected in the Axial Charges of the Beta-Decays of Spin Aligned ^<12>B and ^<12>N"Physical Review Letters. 82. 1644-1647 (1999)

[Publications] 山口貴之 他: "Spin Control of ^<12>B and ^<12>N and Axial Charge from their β-Ray Spin-Alignment Correlations"Hyperfine Interactions. 120/121. 701-705 (1999)

[Publications] 松多健策 他: "Electromagnetic Moments of Short Lived β Emitters ^<21>F,^<23>Mg,^<27>Si, and^<39>Ca"Hyperfine Interactions. 120/121. 673-677 (1999)

[Publications] 佐藤和則 他: "Hyperfine Interactions of ^<19>O in TiO_2 and Quadrupole Moments of ^<13,19>O"Hyperfine Interactions. 120/121. 661-665 (1999)

[Publications] 佐藤和則 他: "Quadrupole Moments of Short-Lived β-Emitters ^<13,19>O and ^<21>F"Nuclear Physics. A654. 735c-738c (1999)

[Publications] 南園忠則 他: "Electromagnetic Moments of β-Emitting Nucleus ^<19>O"Physics Letters. B459. 81-85 (1999)

[Publications] 松多健策 他: "Quadrupole Moment of the Proton Drip-Line Nuclei ^<13>O"Physics Letters. B459. 81-85 (1999)

[Publications] 福田光順 他: "Density Distribution of ^8B Studied via Reaction Cross Sections"Nuclear Physics. A656. 209-228 (1999)

[Publications] 南園忠則 他: "New Limit of the G-Parity Irregular Weak Nucleon Current Disclosed in β-Ray Angular Distributions from Spin Aligned ^<12>B and ^<12>N"Physical Review Letters. 80. 4132-4135 (1998)

[Publications] 南園忠則 他: "Interdisciplinary Regions of Nuclear Phyusics Studied by use of Spin-Polarized Short-Lived Nuclei"Nuclear Instrument and Methods in Physics Reaearch. A402. 218-223 (1998)

[Publications] 松多健策 他: "Creation of Spin Polarization in Unstable Nuclei and Correlation-Type Experiments"Nuclear Instrument and Methods in Physics Reaearch. A402. 229-235 (1998)

[Publications] 南園忠則 他: "Quadrupole Moment of the Proton Rich β-Emitting Nucleus ^<12>N"Pyhsics Letters. B420. 31-36 (1998)

[Publications] 南園忠則 他: "Electric Quadrupole Interactions of Short-Lived β-Emitter ^<12>N in Insulator Crystals (^<12>N implanted in Single Crystal TiO_2)"Z. Naturforsh.. 53a. 293-300 (1998)

[Publications] 福田光順 他: "Reaction Cross Sections Measured for ^8B to Obtain Its Density Distribution"短寿命核ビームの科学'96,KEK Proceedings 97-10. 162-163 (1997)

[Publications] 三原基嗣 他: "Momentum Distribution of ^7Be Produced through ^8B Fragmentation"短寿命核ビームの科学'96,KEK Proceedings 97-10. 164-166 (1997)

[Publications] 南園忠則、野尻洋一、松多健策、佐藤透: "Non-Nulceonic Degrees of Freedom Detected in Nuclei"World Scientific Publishing Co.. 414 (1997)

南園忠則大阪大学, 大学院・理学研究科, 教授 (20028210)

[Publications] 南園啓他: "G-Parity Violation of Weak Nucleon Current and In-Medium Mass Renormalization of Nucleons Detected through the β Decays of Spin Aligned ^<12>B and ^<12>N"Nuclear Physics. (2000)

[Publications] 南園啓他: "New Limit of the G-Parity Irregular Induced Tensor Current and of the Axial Charge in Weak Nucleon Current Detected in Alignment Terms of^<12>B and ^<12>Nβ Decays"Nuclear Physics. A654. 955c-960c (1999)

[Publications] 南園忠則他: "In-Medium Mass Renormalization of Nucleons Detected in the Axial Charges of the Beta-Decays of Spin Aligned ^<12>B and ^<12>N"Physical Review Letters. 82. 1644-1647 (1999)

[Publications] 山口貴之他: "Spin Control of ^<12>B and ^<12>N and Axial Charge from their β-Ray Spin-Alignment Correlations"Hyperfine Interactions. 120/121. 701-705 (1999)

[Publications] 松多健策他: "Electromagnetic Moments of Short Lived β Emitters ^<21>F,^<23>Mg,^<27>Si, and^<39>Ca"Hyperfine Interactions. 120/121. 673-677 (1999)

[Publications] 佐藤和則他: "Hyperfine Interactions of ^<19>O in TiO_2 and Quadrupole Moments of ^<13,19>O"Hyperfine Interactions. 120/121. 661-665 (1999)

[Publications] 佐藤和則他: "Quadrupole Moments of Short-Lived β-Emitters ^<13,19>O and ^<21>F"Nuclear Physics. A654. 735c-738c (1999)

[Publications] 南園忠則他: "Electromagnetic Moments of β-Emitting Nucleus ^<19>O"Physics Letters. B459. 81-85 (1999)

[Publications] 松多健策他: "Quadrupole Moment of the Proton Drip-Line Nuclei ^<13>O"Physics Letters. B459. 81-85 (1999)

[Publications] 福田光順他: "Density Distribution of ^8B Studied via Reaction Cross Sections"Nuclear Physics. A656. 209-228 (1999)

[Publications] 南園忠則他: "New Limit of the G-Parity Irregular Weak Nucleon Current Disclosed in β-Ray Angular Distributions from Spin Aligned ^<12>B and ^<12>N"Physical Review Letters. 80. 4132-4135 (1998)

[Publications] 南園忠則他: "Interdisciplinary Regions of Nuclear Phyusics Studied by use of Spin-Polarized Short-Lived Nuclei"Nuclear Instrument and Methods in Physics Reaearch. A402. 218-223 (1998)

[Publications] 松多健策他: "Creation of Spin Polarization in Unstable Nuclei and Correlation-Type Experiments"Nuclear Instrument and Methods in Physics Reaearch. A402. 229-235 (1998)

[Publications] 南園忠則他: "Quadrupole Moment of the Proton Rich β-Emitting Nucleus ^<12>N"Pyhsics Letters. B420. 31-36 (1998)

[Publications] 南園忠則他: "Electric Quadrupole Interactions of Short-Lived β-Emitter ^<12>N in Insulator Crystals (^<12>N implanted in Single Crystal TiO_2)"Z. Naturforsh.. 53a. 293-300 (1998)

[Publications] 福田光順他: "Reaction Cross Sections Measured for ^8B to Obtain Its Density Distribution"短寿命核ビームの科学'96,KEK Proceedings 97-10. 162-163 (1997)

[Publications] 三原基嗣他: "Momentum Distribution of ^7Be Produced through ^8B Fragmentation"短寿命核ビームの科学'96,KEK Proceedings 97-10. 164-166 (1997)