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Symposium and Celebration to Commemorate the 20th anniversary of Super-Kamiokande

2016/6/28

On June 17th, 2016 a symposium to mark the 20th anniversary of Super-Kamiokande was held in Toyama. The symposium was followed by a celebration and both events were hosted by the Institute for Cosmic Ray Research, University of Tokyo. Around 250 guests composed of both collaborators and people who have supported the continuous observations of Super-Kamiokande attended.

The symposium opened with an address from Prof. Takaaki Kajita, the director of ICRR and was followed by congratulatory speeches from Ms. Yayoi Komatsu, director-general of Research Promotion Bureau, MEXT and Prof. James Stone on behalf of Dr. Alan Stone, High Energy Physics Budget and Planning, the US DOE. Super-Kamiokande collaborators then proceeded to present not only the results of Super-Kamiokande’s research over the last 20 years, but also explained planned upgrades of the experiment and introduced the next generation project, Hyper-Kamiokande.

The symposium to commemorate the 20th anniversary of Super-Kamiokande

Prof. Kajita expressed his gratitude for supporting the continuous observations of Super-Kamiokande.

During the celebration following the symposium, Prof. Makoto Gonokami, president of University of Tokyo, delivered a speech of congratulations which was followed by congratulatory addresses from Mr. Tsuzuku, the Mayor of Hida City, and Prof. Yasuhiro Okada, the director of KEK. Throughout the evening guests and collaborators shared their memories of the early days of Super-Kamiokande and offered their congratulations.

Prof. Jiro Arafune propsed a toast.

Prof. James Stone, co-spokesperson of Super-Kamiokande gave a medal of friendship to Prof. Nakahata.

Speaking on this occasion, Masayuki Nakahata, Spokesperson of Super-Kamiokande and Director of Kamioka Observatory, ICRR, University of Tokyo, noted that, “Over the last 20 years Super-Kamiokande’s numerous neutrino oscillation discoveries have contributed greatly to elementary particle physics. In addition to further contributions that will be made with more data from T2K, Super-Kamiokande can be expected to contribute to astrophysics as well, with observations of supernova neutrinos.” Henry Sobel, Co-Spokesperson of Super-Kamiokande and Professor of Physics at the University of California, Irvine, followed by stating, “Besides having world-leading results and prize-winning discoveries, Super-Kamiokande has led to the awarding of over 70 Ph.D. degrees to students who have gone on to become leaders in new generations of experiments.”

[Link]

►Twenty years after the start of Super-Kamioande

Super-Kamiokande 20th Anniversary Symposium

June 17th, 201615:00-17:00 Wohlfahrt Toyama (Toyoma, Japan)

Opening addresses
Takaaki Kajita Director of Institute for Cosmic Ray Research, the University of Tokyo
Yayoi Komatsu Director-General of Research Promotion Bureau, Ministry of Education, Culture, Sports, Science and Technology
James Stone on behalf of Alan Stone High Energy Physics Budget and Planning, United States Department of Energy pdf
Scientific presentations
Introduction Masayuki Nakahata (Spokesperson, Kamioka Observatory) pdf
Discovery of atmospheric neutrino oscillation and recent progress Edward Kearns (Boston University) pdf
Discovery of solar neutrino oscillation and recent progress Yoichiro Suzuki (Kavli Institute for the Physics and Mathematics of the Universe) pdf
K2K and T2K experiments Tsuyoshi Nakaya (Kyoto University) pdf
Success of the international collaboration Christopher Walter (Duke University) pdf
Theoretical importance of the Super-Kamiokande results Alexei Smirnov (Max Planck Institute) pdf
Hyper-Kamiokande Masato Shiozawa (Kamioka Observatory, ICRR, University of Tokyo) pdf
Future of Super-Kamiokande Masayuki Nakahata (Spokesperson, Kamioka Observatory) pdf

Chronology

1991.12 Start of excavation of the cavity

Excavating hard rock, Hida gneiss, using a blasting method

1994.6 Completion of excavation of the cavity and start of detector construction

Construction of a stainless tank by attaching stainless plates on the wall of the cavity with 40m in diameter and 58m in hight, and installtion of PMTs in module units on the inner detector wall

1996.1 Filling the SK detector with pure water

Inseide the deteoctor during filling water. Taking two months to fill up SK detector woth 50,000 ton of pure water

1996.4 The first operation of Super-Kamiokande detector at 0:00AM, which was started by the first spokesperson, Prof. Yoji Totsuka.

Collaborators surrounding Prof. Totsuka in the control room in the Kamioka mine

1998.6 Discovery of atmospheric neutrino oscillation

1999.1 Asahi Prize to Super-K collaborators

1999.6 Start of the K2K experiment

2001.6 Discovery of solar neutrino oscillation

2001.7 Work to replace malfunctioning PMTs

2001.11 An accident damages half of the Super-K PMTs. Prof. Totsuka: "We will rebuild the detector. There is no question."

2002.4 Restortion work from the accident

2002.10 Restart with a half density of PMTs

Inside the inner detector with a half density of PMTs

2002.12 The 2002 Nobel Prize in Physics awarded to Prof. Masatoshi Koshiba

2004.6 Confirmation of atmospheric neutrino oscillation by the K2K experiment using beam neutrinos

2004.7 Direct observation of an oscillatory signature in the atmospheric neutrino samples

2005.10 Reconstruction work for full recovery of the PMT density

Installation of reflective Tybek sheets in the outer detector region

2006.7 Completion of full reconstruction and the start of SK-III

Water surface close to the topmost PMTs

2008.9 Replacement of fron-end electronics and data aquisition system (DAQ)

New electronics connected to new DAW system

2009.4 Start of the T2K (Tokai to Kamioka) experiment, the first off-axis neutrino oscillation experiment

2010.6 Launching a test facility for the SK-Gd project

Inside the 200 ton tank of the test facility for SK-Gd project

2011.6 Discovery of electron neutrino appearance in the T2K experiment

2012.7 Proton decay p→e+π0 lifetime limit published by SK exceeds 1034years.

2013.7 Measurement of electron neutrino apperance in the T2K experiment

2015.11 2016 Breakthrough Prixe in Fundamental Physics awarded to Prof. Yoichiro Suzuki, Prof. Takaaki Kajita and SK Collaborators, and Prof. Koichiro Nishikawa and K2K/T2K Collaborators

2015.12 The 2015 Nobe Prize in Physics awarded to Prof. Takaaki Kajita