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Search for neutral Q-balls in Super-Kamiokande II
Super-Kamiokande Collaboration,Takenaga, Y.,Abe, K.,Hayato, Y.,Iida, T.,Ishihara, K.,Kameda, J.,Koshio, Y.,Minamino, A.,Mitsuda, C.,Miura, M.,Moriyama, S.,Nakahata, M.,Obayashi, Y.,Ogawa, H.,Shiozawa, North-Holland Pub. Co 2007 Physics letters. Section B Vol.647 No.1
A search for Q-balls has been carried out in Super-Kamiokande II with 541.7 days of live time. A neutral Q-ball passing through the detector can interact with nuclei to produce pions, generating a signal of successive contained pion events along a track. No candidate for successive contained event groups has been found in Super-Kamiokande II, so we obtain upper limits on the flux of such Q-balls.
First study of neutron tagging with a water Cherenkov detector
The Super-Kamiokande Collaboration,Watanabe, H.,Zhang, H.,Abe, K.,Hayato, Y.,Iida, T.,Ikeda, M.,Kameda, J.,Kobayashi, K.,Koshio, Y.,Miura, M.,Moriyama, S.,Nakahata, M.,Nakayama, S.,Obayashi, Y.,Ogawa, North-Holland 2009 Astroparticle physics Vol.31 No.4
A first study of neutron tagging is conducted in Super-Kamiokande, a 50,000 ton water Cherenkov detector. The tagging efficiencies of thermal neutrons are evaluated in a 0.2% GdCl<SUB>3</SUB>-water solution and pure water. They are determined to be, respectively, 66.7% for events above 3MeV and 20% with corresponding background probabilities of 2x10<SUP>-4</SUP> and 3x10<SUP>-2</SUP>. This newly developed technique may enable water Cherenkov detectors to identify ν@?<SUB>e</SUB>'s from astrophysical sources as well as those produced by commercial reactors via the delayed coincidence scheme.
Supernova Relic Neutrino search with neutron tagging at Super-Kamiokande-IV
The Super-Kamiokande Collaboration,Zhang, H.,Abe, K.,Hayato, Y.,Iyogi, K.,Kameda, J.,Kishimoto, Y.,Miura, M.,Moriyama, S.,Nakahata, M.,Nakano, Y.,Nakayama, S.,Sekiya, H.,Shiozawa, M.,Suzuki, Y.,Takeda North-Holland 2015 Astroparticle physics Vol.60 No.-
A search for Supernova Relic Neutrinos ν@?<SUB>e</SUB>'s is first conducted via inverse-beta-decay by tagging neutron capture on hydrogen at Super-Kamiokande-IV. The neutron tagging efficiency is determined to be (17.74+/-0.04<SUB>stat.</SUB>+/-1.05<SUB>sys.</SUB>)%, while the corresponding accidental background probability is (1.06+/-0.01<SUB>stat.</SUB>+/-0.18<SUB>sys.</SUB>)%. Using 960days of data, we obtain 13 inverse-beta-decay candidates in the range of E<SUB>ν@?'e</SUB> between 13.3MeV and 31.3MeV. All of the observed candidates are attributed to background. Upper limits at 90% C.L. are calculated in the absence of a signal.
Search for GUT monopoles at Super-Kamiokande
The Super-Kamiokande Collaboration,Ueno, K.,Abe, K.,Hayato, Y.,Iida, T.,Iyogi, K.,Kameda, J.,Koshio, Y.,Kozuma, Y.,Miura, M.,Moriyama, S.,Nakahata, M.,Nakayama, S.,Obayashi, Y.,Sekiya, H.,Shiozawa, M. North-Holland ; Elsevier Science Ltd 2012 Astroparticle physics Vol.36 No.1
GUT monopoles captured by the Sun's gravitation are expected to catalyze proton decays via the Callan-Rubakov process. In this scenario, protons, which initially decay into pions, will ultimately produce ν<SUB>e</SUB>,ν<SUB>μ</SUB> and ν@?<SUB>μ</SUB>. After undergoing neutrino oscillation, all neutrino species appear when they arrive at the Earth, and can be detected by a 50,000 metric ton Water Cherenkov detector, Super-Kamiokande (SK). A search for low energy neutrinos in the electron total energy range from 19 to 55MeV was carried out with SK and gives a monopole flux limit of F<SUB>M</SUB>(σ<SUB>0</SUB>/1mb)<6.3x10<SUP>-24</SUP>(β<SUB>M</SUB>/10<SUP>-3</SUP>)<SUP>2</SUP>cm<SUP>-2</SUP>s<SUP>-1</SUP>sr<SUP>-1</SUP> at 90% C.L., where β<SUB>M</SUB> is the monopole velocity in units of the speed of light and σ<SUB>0</SUB> is the catalysis cross section at β<SUB>M</SUB>=1. The obtained limit is several orders of magnitude more stringent than the current best cosmic-ray supermassive monopole flux limit for β<SUB>M</SUB><10<SUP>-2</SUP> and also two orders of magnitude lower than the result of the Kamiokande experiment, which used a similar detection method.