Butsuri

Online ISSN : 2423-8872
Print ISSN : 0029-0181
ISSN-L : 0029-0181

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Volume 58, Issue 5

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[title in Japanese]

Article type: Cover
2003 Volume 58 Issue 5 Pages Cover1-
Published: May 05, 2003
Released on J-STAGE: March 07, 2019

DOIhttps://doi.org/10.11316/butsuri1946.58.5.Cover1

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[title in Japanese]

Article type: Index
2003 Volume 58 Issue 5 Pages Toc1-
Published: May 05, 2003
Released on J-STAGE: March 07, 2019

DOIhttps://doi.org/10.11316/butsuri1946.58.5.Toc1

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[title in Japanese]

Article type: Index
2003 Volume 58 Issue 5 Pages Toc2-
Published: May 05, 2003
Released on J-STAGE: March 07, 2019

DOIhttps://doi.org/10.11316/butsuri1946.58.5.Toc2

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Forwards (<Special Issue>Physics of Neutrino - Commemorating Masatoshi Koshiba's Winning of the Nobel Prize in Physics -)

Masatoshi Koshiba

Article type: Article
2003 Volume 58 Issue 5 Pages 313-
Published: May 05, 2003
Released on J-STAGE: March 07, 2019

DOIhttps://doi.org/10.11316/butsuri1946.58.5.313

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Introduction to Neutrino Physics (<Special Issue>Physics of Neutrino - Commemorating Masatoshi Koshiba's Winning of the Nobel Prize in Physics -)

Yoji Totsuka

2003 Volume 58 Issue 5 Pages 314-322
Published: May 05, 2003
Released on J-STAGE: April 14, 2008

DOIhttps://doi.org/10.11316/butsuri1946.58.314

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An elementary particle "neutrino" was born in Pauli's conjecture 70 years ago. Its study has made remarkable contributions to establishing the weak interactions and the electro-weak unification theory. Recently much interest has been directed to investigating the intrinsic properties of the neutrinos and important experimental results on their masses and mixings were obtained. This article introduces several experiments that have made break-throughs in neutrino physics. Also presented is a personal view of what should be done in future to further develop neutrino physics. This article is devoted to Professor Koshiba's 2002 Nobel Prize in physics.

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Mass of Neutrino and Particle Physics (<Special Issue>Physics of Neutrino - Commemorating Masatoshi Koshiba's Winning of the Nobel Prize in Physics -)

Tsutomu Yanagida

2003 Volume 58 Issue 5 Pages 323-326
Published: May 05, 2003
Released on J-STAGE: April 14, 2008

DOIhttps://doi.org/10.11316/butsuri1946.58.323

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We give a brief review on the seesaw mechanism in a grand unified theory which predicts small neutrino masses. In the seesaw mechanism the lepton-number conservation is broken and neutrinos have Majorana type masses. We also explain why the lepton-number nonconservation can be an origin of the baryon-number asymmetry in the present universe.

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Discovery of Atmospheric Neutrino Oscillations (<Special Issue>Physics of Neutrino - Commemorating Masatoshi Koshiba's Winning of the Nobel Prize in Physics -)

Takaaki Kajita

2003 Volume 58 Issue 5 Pages 326-331
Published: May 05, 2003
Released on J-STAGE: April 14, 2008

DOIhttps://doi.org/10.11316/butsuri1946.58.326

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Cosmic ray particles entering the atmosphere interact with the air nuclei and produce neutrinos. These neutrinos are called atmospheric neutrinos. The atmospheric neutrino anomaly observed in Kamiokande is now understood as due to neutrino oscillations by high statistics measurements of the atmospheric neutrinos in Super-Kamiokande. The studies of the atmospheric neutrinos have matured into detailed studies of neutrino masses and mixings.

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KEK to Kamioka Long Baseline Neutrino Oscillation Experiment K2K and Future Plan (<Special Issue>Physics of Neutrino - Commemorating Masatoshi Koshiba's Winning of the Nobel Prize in Physics -)

Koichiro Nishikawa

2003 Volume 58 Issue 5 Pages 332-337
Published: May 05, 2003
Released on J-STAGE: April 14, 2008

DOIhttps://doi.org/10.11316/butsuri1946.58.332

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The K2K collaboration has established the principles of the accelerator based long baseline neutrino experiment. The data prove the existence of neutrino oscillation with better than 99% confidence level and the indication of the neutrino spectrum distortion is observed. The results of oscillation analysis show that the oscillation parameters are consistent with the atmospheric neutrino results from Super-Kamiokande experiment.

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Solar Neutrino Experiments : Now and Future (<Special Issue>Physics of Neutrino - Commemorating Masatoshi Koshiba's Winning of the Nobel Prize in Physics -)

Masayuki Nakahata, Yoichiro Suzuki

2003 Volume 58 Issue 5 Pages 337-342
Published: May 05, 2003
Released on J-STAGE: April 14, 2008

DOIhttps://doi.org/10.11316/butsuri1946.58.337

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The deficit of the solar neutrino event rate (so called "solar neutrino problem") was initially presented by Davis since 1960s. It was established as a deficit of the solar neutrino flux by Kamiokande led by Koshiba. In the recent two years, it was found that the solar neutrino problem is due to neutrino oscillations by the results from Super-Kamiokande and SNO experiments. Combining with other solar neutrino experiments, most probable solution of the neutrino oscillation parameters was the Large Mixing Angle (LMA) solution. In December 2002, the reactor long baseline experiment. KamLAND, confirmed that the LMA is the correct solution.

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First Results from KamLAND : Evidence for Reactor Anti-neutrino Disappearance (<Special Issue>Physics of Neutrino - Commemorating Masatoshi Koshiba's Winning of the Nobel Prize in Physics -)

Atsuto Suzuki

2003 Volume 58 Issue 5 Pages 343-348
Published: May 05, 2003
Released on J-STAGE: April 14, 2008

DOIhttps://doi.org/10.11316/butsuri1946.58.343

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In January 22, 2002, KamLAND started the data-taking. With the data sample from March 3 through October 6, 2002. KamLAND has measured the flux of electron antineutrinos from distant nuclear reactors. We find fewer electron antineutrino events than expected from standard assumptions about electron antineutrino propagation at the 99.95%C.L. In a 162 ton-yr exposure the ratio of the number of observed inverse β-decay events to the expected number without electron antineutrino disappearance is 0.611±0.085 (stat) ± 0.041 (syst) for electron antineutrino energies >3.4 MeV. In the context of two-flavor neutrino oscillations with CPT invariance, all solutions to the solar neutrino problem except for the "large mixing angle" region are excluded.

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Phenomenology of Neutrino Oscillation (<Special Issue>Physics of Neutrino - Commemorating Masatoshi Koshiba's Winning of the Nobel Prize in Physics -)

Osamu Yasuda

2003 Volume 58 Issue 5 Pages 349-355
Published: May 05, 2003
Released on J-STAGE: April 14, 2008

DOIhttps://doi.org/10.11316/butsuri1946.58.349

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A lot of information on the mixing matrix and the mass squared differences of neutrino oscillation have been revealed recently thanks to various experiments on neutrino oscillation. The conclusion is that almost everything is well accounted for by neutrino oscillation among three flavors. In this article I will describe how the three flavor mixing matrix is derived and the status of four neutrino mixing scenarios which would be necessary to account for the LSND experiment in Los Alamos and I will explain on phenomenology of long baseline experiments (determination of the third mixing angle, the mass squared difference of the atmospheric neutrino oscillation and the CP violating phase in the three flavor framework) which are studied actively at present.

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Neutrinos and the Origin Flavor (<Special Issue>Physics of Neutrino - Commemorating Masatoshi Koshiba's Winning of the Nobel Prize in Physics -)

Hitoshi Murayama

2003 Volume 58 Issue 5 Pages 356-361
Published: May 05, 2003
Released on J-STAGE: April 14, 2008

DOIhttps://doi.org/10.11316/butsuri1946.58.356

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In this article, we review the impact of the discovery of neutrino oscillation on our understanding of flavor.

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Dictionary of Technical Terms (<Special Issue>Physics of Neutrino - Commemorating Masatoshi Koshiba's Winning of the Nobel Prize in Physics -)

Kaoru Hagiwara

2003 Volume 58 Issue 5 Pages 361-366
Published: May 05, 2003
Released on J-STAGE: April 14, 2008

DOIhttps://doi.org/10.11316/butsuri1946.58.361

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[title in Japanese]

Article type: Appendix
2003 Volume 58 Issue 5 Pages 367-
Published: May 05, 2003
Released on J-STAGE: March 07, 2019

DOIhttps://doi.org/10.11316/butsuri1946.58.5.367_1

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Memories of Late Professor Gen Matsumoto - Approach to the Brain through Squids, Light and Love

Kazuyuki Aihara

Article type: Article
2003 Volume 58 Issue 5 Pages 367-368
Published: May 05, 2003
Released on J-STAGE: March 07, 2019

DOIhttps://doi.org/10.11316/butsuri1946.58.5.367_2

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[title in Japanese]

[in Japanese]

Article type: Article
2003 Volume 58 Issue 5 Pages 368-369
Published: May 05, 2003
Released on J-STAGE: March 07, 2019

DOIhttps://doi.org/10.11316/butsuri1946.58.5.368

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[title in Japanese]

[in Japanese]

Article type: Article
2003 Volume 58 Issue 5 Pages 369-
Published: May 05, 2003
Released on J-STAGE: March 07, 2019

DOIhttps://doi.org/10.11316/butsuri1946.58.5.369_1

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[title in Japanese]

[in Japanese]

Article type: Article
2003 Volume 58 Issue 5 Pages 369-370
Published: May 05, 2003
Released on J-STAGE: March 07, 2019

DOIhttps://doi.org/10.11316/butsuri1946.58.5.369_2

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[title in Japanese]

[in Japanese]

Article type: Article
2003 Volume 58 Issue 5 Pages 370-
Published: May 05, 2003
Released on J-STAGE: March 07, 2019

DOIhttps://doi.org/10.11316/butsuri1946.58.5.370

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[title in Japanese]

Article type: Appendix
2003 Volume 58 Issue 5 Pages 371-372
Published: May 05, 2003
Released on J-STAGE: March 07, 2019

DOIhttps://doi.org/10.11316/butsuri1946.58.5.371

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[title in Japanese]

Article type: Appendix
2003 Volume 58 Issue 5 Pages 372-375
Published: May 05, 2003
Released on J-STAGE: March 07, 2019

DOIhttps://doi.org/10.11316/butsuri1946.58.5.372

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[title in Japanese]

Article type: Appendix
2003 Volume 58 Issue 5 Pages 375-378
Published: May 05, 2003
Released on J-STAGE: March 07, 2019

DOIhttps://doi.org/10.11316/butsuri1946.58.5.375

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[title in Japanese]

Article type: Appendix
2003 Volume 58 Issue 5 Pages 378-379
Published: May 05, 2003
Released on J-STAGE: March 07, 2019

DOIhttps://doi.org/10.11316/butsuri1946.58.5.378

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[title in Japanese]

Article type: Appendix
2003 Volume 58 Issue 5 Pages 379-380
Published: May 05, 2003
Released on J-STAGE: March 07, 2019

DOIhttps://doi.org/10.11316/butsuri1946.58.5.379

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[title in Japanese]

Article type: Appendix
2003 Volume 58 Issue 5 Pages 381-
Published: May 05, 2003
Released on J-STAGE: March 07, 2019

DOIhttps://doi.org/10.11316/butsuri1946.58.5.381

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[title in Japanese]

Article type: Appendix
2003 Volume 58 Issue 5 Pages 382-
Published: May 05, 2003
Released on J-STAGE: March 07, 2019

DOIhttps://doi.org/10.11316/butsuri1946.58.5.382_4

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[title in Japanese]

Article type: Appendix
2003 Volume 58 Issue 5 Pages 383-388
Published: May 05, 2003
Released on J-STAGE: March 07, 2019

DOIhttps://doi.org/10.11316/butsuri1946.58.5.383

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[title in Japanese]

Article type: Appendix
2003 Volume 58 Issue 5 Pages 388-390
Published: May 05, 2003
Released on J-STAGE: March 07, 2019

DOIhttps://doi.org/10.11316/butsuri1946.58.5.388

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[title in Japanese]

Article type: Appendix
2003 Volume 58 Issue 5 Pages 391-395
Published: May 05, 2003
Released on J-STAGE: March 07, 2019

DOIhttps://doi.org/10.11316/butsuri1946.58.5.391

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[title in Japanese]

Article type: Appendix
2003 Volume 58 Issue 5 Pages 396-
Published: May 05, 2003
Released on J-STAGE: March 07, 2019

DOIhttps://doi.org/10.11316/butsuri1946.58.5.396

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