1997 Fiscal Year Annual Research Report

ニュートリノ物理に関する総合的研究

Research Project

Project/Area Number	08304022
Research Institution	Tohoku University
Principal Investigator	鈴木厚人東北大学, 理学部, 教授 (00100818)
Co-Investigator(Kenkyū-buntansha)	山口晃東北大学, 大学院・理学研究科, 教授 (60004470) 柳田勉東京大学, 大学院・理学研究科, 教授 (10125677) 吉村太彦東北大学, 大学院・理学研究科, 教授 (70108447) 鈴木洋一郎東京大学, 宇宙線研究所, 教授 (70144425) 丹羽公雄名古屋大学, 大学院・理学研究科, 教授 (60113445)
Keywords	ニュートリノ / ニュートリノ振動 / 大気ニュートリノ / 太陽ニュートリノ
Research Abstract	本年度はスーパー・カミオカンデのデータが蓄積して、太陽ニュートリノ、大気ニュートリノの詳細な解析が可能になった。特に太陽ニュートリノ欠損問題や大気ニュートリノ異常問題を解明する有力な説である。ニュートリノ振動に関する解析でカミオカンデを大幅に凌駕する信頼度でニュートリノ振動の可能性が確認された。東北大学が推進している液体シンチレータ・反ニュートリノ観測実験は、実験装置の最終案が決まり、来年度から観測装置の建設が始まる。又使用する液体シンチレータの開発、新20″光電子増倍管の開発も終わり、順調に研究が進行している。名古屋大学が行っているν^→_<μ←>ν_τ振動実験は、データ量が増大し、解析が急ピッチで進行している。今のところν_τ現象が見つかっていないが、今後の解析が期待される。つくば市の高エネルギー加速器研究機構(KEK)で生成したニュートリノ・ビームを神岡鉱山内のスーパー・カミオカンデに入射させてν^→_<μ←>ν_x振動を測定する実験は、現在KEK側でのビームラインの運転、装置建設の順調に行われており、1999年1月の実験開始に向けて研究者一丸となって取り組んでいる。本年度も日本におけるニュートリノ物理学及び関連する素粒子、宇宙物理学における最新の研究成果の発表と情報交換の場として、11月に八幡平で2日半の研究会を開催した。総出席者数58人、発表者数25人で活発な議論が行われた。以上のように、ニュートリノ物理学の実験的研究は、現在世界をリ-ドする研究が日本で行われており、現行実験のさらなる研究の推進と、これから実験装置が完成して実験開始を目指している研究に期待がかけられている。

Research Products

(27 results)

All Other

All Publications (27 results)

[Publications] R.S.Raghavan: "Measuring the global radioactivity in the earth by multidetector antineutrino spectroscupy" Physical Review Letter. 80. 635-638 (1998)
[Publications] Y.Fukuda: "Measurement of a small atmospheric nu-mu/nu-e ratio" Physics Letters. (発表予定). (1998)
[Publications] S.Kasuya: "Domain wall problem of axion and isocurvature fluctuations in chaotic inflation models" Physics Letters. 13415. 117-121 (1997)
[Publications] I.K.Izawa: "Dymamical Tuning of the initial condition for new inflation in supergravity" Physics Letters. B411. 249-255 (1997)
[Publications] J.Hashiba: "Cosmological Constraint on string Dilaton in gauge-mediated supersymmetry breaking theories" Physical Review Letter. 79. 4525-4528 (1997)
[Publications] I.K.Izawa: "Direct-Transmission models of dynamical supersymmetry breaking" Physical Review. D56. 2886-2892 (1997)
[Publications] I.K.Izawa: "R-invariant natural unification" Progress of Theoretical Physics. 97. 913-920 (1997)
[Publications] M.Kawasaki: "Are iso curvature fluctuations of the M-theory axion observable ?" Progress of Theoretical physics. 97. 809-812 (1997)
[Publications] T.Yanagida: "A solution tie the μ problem in Gauge-mediated supersymmetry-breaking" Physics Letters. B400. 109-111 (1997)
[Publications] M.Kawasaki: "Constraint on Cosmic Density of the String Moduli Field in gauge-mediated supersymmetry breaking theories" Physics Letters. B399. 45-48 (1997)
[Publications] H.Hanai: "Ueasurement of the τ polarization in e^+e^+ annihilation at √<S>=58 GeV" Physics Letters. B403. 155-162 (1997)
[Publications] T.Arima: "Precise measurement of Bhabha scattering at a center of mass energy of 57.77 GeV" Physical Review. D55. 19-39 (1997)
[Publications] M.Hotta: "Quantum system under periodic perturbation:effect of environment" Physical Review. D55. 4614-4639 (1997)
[Publications] I.Joichi: "Quantum dissipation in open Harmonic systems Operator solution and application to decay proess" Progress of Theoretical Physics. 98. 9-28 (1997)
[Publications] I.Joichi: "Quantum dissipation and decay in medium" Physical Review. A57. 798-805 (1988)
[Publications] H.P.Nilles: "Super symmetry breaking and soft terms in M-theory" Physics Letters. B415. 24-30 (1997)
[Publications] E.Pierpaoli: "The formation of cosmic structures in a light gravitino dominated universe" Physical Review. D(発表予定). (1998)
[Publications] Y.Fukuda: "Measurement of the solar neutrino flux from Super-Kamiokande's first 300 days" Physics Review Letter. (発表予定). (1998)
[Publications] M.Nakahata: "Calibration of Super-Kamiokande using an electron LINAC" Nuclear Instruments and Methods. (発表予定). (1998)
[Publications] H.Minakata: "How to measure CP-violation in neutrino oscillation experiments ?" Physics Letters. B413. 369-377 (1997)
[Publications] H.Minakata: "Constraining almost degenerate three flavor meutrinos" Physical Review. D56. 1692-1697 (1997)
[Publications] A.Chodos: "The thermodynamic Bethe ansatz and the 1/N correction to the density phase transition in Gross-Neveu Model" Nuclear Physics. B490. 687-698 (1997)
[Publications] H.Minakata: "Can long-base line neutrino oscillation experiments tellus about neutrino dark matter" Astroparticle Physics. 8. 193-200 (1998)
[Publications] H.Minakata: "CP-violation versus the matter effect in long-base line neutrino oscillation experiments" Physical Review. D(発表予定). (1998)
[Publications] H.Hiro-oka: "Two-pion correlations in a possible experimental probe for diooriented chiral comdensates" Physics Letters. B(発表予定). (1998)
[Publications] A.Suzuki: "Large scale anisotropy of the cosmic ray muonflux in kamiokande" Physical Review. D56. 23-26 (1997)
[Publications] M.Yoshimura: "Proceedings at AIJIC97 on “Recent Development in Nonparturbative Quantum Field Theory" World Scientific, (1998)

1997 Fiscal Year Annual Research Report

ニュートリノ物理に関する総合的研究

Principal Investigator

鈴木 厚人 東北大学, 理学部, 教授 (00100818)

Research Products

[Publications] R.S.Raghavan: "Measuring the global radioactivity in the earth by multidetector antineutrino spectroscupy" Physical Review Letter. 80. 635-638 (1998)

[Publications] Y.Fukuda: "Measurement of a small atmospheric nu-mu/nu-e ratio" Physics Letters. (発表予定). (1998)

[Publications] S.Kasuya: "Domain wall problem of axion and isocurvature fluctuations in chaotic inflation models" Physics Letters. 13415. 117-121 (1997)

[Publications] I.K.Izawa: "Dymamical Tuning of the initial condition for new inflation in supergravity" Physics Letters. B411. 249-255 (1997)

[Publications] J.Hashiba: "Cosmological Constraint on string Dilaton in gauge-mediated supersymmetry breaking theories" Physical Review Letter. 79. 4525-4528 (1997)

[Publications] I.K.Izawa: "Direct-Transmission models of dynamical supersymmetry breaking" Physical Review. D56. 2886-2892 (1997)

[Publications] I.K.Izawa: "R-invariant natural unification" Progress of Theoretical Physics. 97. 913-920 (1997)

[Publications] M.Kawasaki: "Are iso curvature fluctuations of the M-theory axion observable ?" Progress of Theoretical physics. 97. 809-812 (1997)

[Publications] T.Yanagida: "A solution tie the μ problem in Gauge-mediated supersymmetry-breaking" Physics Letters. B400. 109-111 (1997)

[Publications] M.Kawasaki: "Constraint on Cosmic Density of the String Moduli Field in gauge-mediated supersymmetry breaking theories" Physics Letters. B399. 45-48 (1997)

[Publications] H.Hanai: "Ueasurement of the τ polarization in e^+e^+ annihilation at √<S>=58 GeV" Physics Letters. B403. 155-162 (1997)

[Publications] T.Arima: "Precise measurement of Bhabha scattering at a center of mass energy of 57.77 GeV" Physical Review. D55. 19-39 (1997)

[Publications] M.Hotta: "Quantum system under periodic perturbation:effect of environment" Physical Review. D55. 4614-4639 (1997)

[Publications] I.Joichi: "Quantum dissipation in open Harmonic systems Operator solution and application to decay proess" Progress of Theoretical Physics. 98. 9-28 (1997)

[Publications] I.Joichi: "Quantum dissipation and decay in medium" Physical Review. A57. 798-805 (1988)

[Publications] H.P.Nilles: "Super symmetry breaking and soft terms in M-theory" Physics Letters. B415. 24-30 (1997)

[Publications] E.Pierpaoli: "The formation of cosmic structures in a light gravitino dominated universe" Physical Review. D(発表予定). (1998)

[Publications] Y.Fukuda: "Measurement of the solar neutrino flux from Super-Kamiokande's first 300 days" Physics Review Letter. (発表予定). (1998)

[Publications] M.Nakahata: "Calibration of Super-Kamiokande using an electron LINAC" Nuclear Instruments and Methods. (発表予定). (1998)

[Publications] H.Minakata: "How to measure CP-violation in neutrino oscillation experiments ?" Physics Letters. B413. 369-377 (1997)

[Publications] H.Minakata: "Constraining almost degenerate three flavor meutrinos" Physical Review. D56. 1692-1697 (1997)

[Publications] A.Chodos: "The thermodynamic Bethe ansatz and the 1/N correction to the density phase transition in Gross-Neveu Model" Nuclear Physics. B490. 687-698 (1997)

[Publications] H.Minakata: "Can long-base line neutrino oscillation experiments tellus about neutrino dark matter" Astroparticle Physics. 8. 193-200 (1998)

[Publications] H.Minakata: "CP-violation versus the matter effect in long-base line neutrino oscillation experiments" Physical Review. D(発表予定). (1998)

[Publications] H.Hiro-oka: "Two-pion correlations in a possible experimental probe for diooriented chiral comdensates" Physics Letters. B(発表予定). (1998)

[Publications] A.Suzuki: "Large scale anisotropy of the cosmic ray muonflux in kamiokande" Physical Review. D56. 23-26 (1997)

[Publications] M.Yoshimura: "Proceedings at AIJIC97 on “Recent Development in Nonparturbative Quantum Field Theory" World Scientific, (1998)

鈴木厚人東北大学, 理学部, 教授 (00100818)