Showing papers by "K. Ishihara published in 2007"
Queen's University1, University of Tokyo2, Boston University3, Pennsylvania State University4, Brookhaven National Laboratory5, University of California, Irvine6, California State University, Dominguez Hills7, Duke University8, George Mason University9, Gifu University10, Indiana University11, Kobe University12, Kyoto University13, Los Alamos National Laboratory14, Louisiana State University15, University of Maryland, College Park16, University of Minnesota17, Miyagi University of Education18, Nagoya University19, Okayama University20, Osaka University21, Seoul National University22, Shizuoka University23, Stony Brook University24, Tohoku University25, Tokai University26, Tokyo Institute of Technology27, University of Warsaw28, University of Washington29, Shinshu University30
TL;DR: In this article, the first 2D celestial map of primary cosmic-ray flux was obtained from 2.10 10 8 8 cosmic ray muons accumulated in 1662.0 days of Super-Kamiokande, which indicated an (0:104 0:020)% excess region in the constellation of Taurus and a ( 0:094 0:014)% deficit region toward Virgo.
Abstract: A first-ever 2-dimensional celestial map of primary cosmic-ray flux was obtained from 2:10 10 8 cosmic-ray muons accumulated in 1662.0 days of Super-Kamiokande. The celestial map indicates an (0:104 0:020)% excess region in the constellation of Taurus and a (0:094 0:014)% deficit region toward Virgo. Interpretations of this anisotropy are discussed.
179 citations
Okayama University1, University of Tokyo2, Miyagi University of Education3, University of California, Irvine4, Boston University5, Pennsylvania State University6, Brookhaven National Laboratory7, California State University, Dominguez Hills8, Chonnam National University9, Duke University10, George Mason University11, Gifu University12, University of Hawaii13, Indiana University14, KEK15, Kobe University16, Kyoto University17, Los Alamos National Laboratory18, Louisiana State University19, University of Maryland, College Park20, University of Minnesota21, Nagoya University22, State University of New York System23, Niigata University24, Osaka University25, Seoul National University26, Shizuoka University27, Sungkyunkwan University28, Tohoku University29, Tokai University30, Tokyo Institute of Technology31, Tsinghua University32, University of Warsaw33, University of Washington34
TL;DR: In this article, the results of a search for neutrino bursts from supernova explosions using the Super-Kamiokande detector were reported, showing that the expected number of events comprising such a burst is 104, and the average energy of the neutrinos is in the range of a few tens of MeV for a core-collapse supernova explosion at a typical distance in our galaxy (10 kpc); this strong signal means that the detection efficiency anywhere within our galaxy and well past the Magellanic Clouds should be 100%.
Abstract: We report the results of a search for neutrino bursts from supernova explosions using the Super-Kamiokande detector. Super-Kamiokande is sensitive to core-collapse supernova explosions via observation of their neutrino emissions. The expected number of events comprising such a burst is ~104, and the average energy of the neutrinos is in the range of a few tens of MeV for a core-collapse supernova explosion at a typical distance in our galaxy (10 kpc); this strong signal means that the detection efficiency anywhere within our galaxy and well past the Magellanic Clouds should be 100%. We examined a data set taken from 1996 May to 2001 July, and from 2002 December to 2005 October, corresponding to 2589.2 live days. However, there is no evidence of such a supernova explosion during the data-taking period. The 90% C.L. upper limit on the rate of core-collapse supernova explosions out to distances of 100 kpc is found to be 0.32 SN yr-1.
167 citations
TL;DR: A search for Q-balls has been carried out in Super-Kamiokande II with 541.7 days of live time as mentioned in this paper, but no candidate for successive contained event groups has been found.
34 citations