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SEARCH FOR ASTROPHYSICAL NEUTRINO POINT SOURCES AT SUPER-KAMIOKANDE
Thrane, E.,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, H.,Sekiya, H.,Shiozawa, M.,Suzuki, Y.,Takeda, IOP Publishing 2009 The Astrophysical journal Vol.704 No.1
<P>It has been hypothesized that large fluxes of neutrinos may be created in astrophysical 'cosmic accelerators.' The primary background for a search for astrophysical neutrinos comes from atmospheric neutrinos, which do not exhibit the pointlike directional clustering that characterizes a distant astrophysical signal. We perform a search for neutrino point sources using the upward-going muon data from three phases of operation (SK-I, SK-II, and SK-III) spanning 2623 days of live time taken from 1996 April 1 to 2007 August 11. The search looks for signals from suspected galactic and extragalactic sources, transient sources, and uncataloged sources. While we find interesting signatures from two objects-RX J1713.7-3946 (97.5% CL) and GRB 991004D (95.3% CL)-these signatures lack compelling statistical significance given trial factors. We set limits on the flux and fluence of neutrino point sources above energies of 1.6 GeV.</P>
Search for dinucleon decay into pions at Super-Kamiokande
Gustafson, J.,Abe, K.,Haga, Y.,Hayato, Y.,Ikeda, M.,Iyogi, K.,Kameda, J.,Kishimoto, Y.,Miura, M.,Moriyama, S.,Nakahata, M.,Nakajima, T.,Nakano, Y.,Nakayama, S.,Orii, A.,Sekiya, H.,Shiozawa, M.,Takeda, American Physical Society 2015 PHYSICAL REVIEW D - Vol.91 No.7
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.
Search for proton decay viap→νK+using260 kiloton·yeardata of Super-Kamiokande
Abe, K.,Hayato, Y.,Iyogi, K.,Kameda, J.,Miura, M.,Moriyama, S.,Nakahata, M.,Nakayama, S.,Wendell, R. A.,Sekiya, H.,Shiozawa, M.,Suzuki, Y.,Takeda, A.,Takenaga, Y.,Ueno, K.,Yokozawa, T.,Kaji, H.,Kajita American Physical Society 2014 PHYSICAL REVIEW D - Vol.90 No.7
Limits on sterile neutrino mixing using atmospheric neutrinos in Super-Kamiokande
Abe, K.,Haga, Y.,Hayato, Y.,Ikeda, M.,Iyogi, K.,Kameda, J.,Kishimoto, Y.,Miura, M.,Moriyama, S.,Nakahata, M.,Nakano, Y.,Nakayama, S.,Sekiya, H.,Shiozawa, M.,Suzuki, Y.,Takeda, A.,Tanaka, H.,Tomura, T. American Physical Society 2015 PHYSICAL REVIEW D - Vol.91 No.5
Tanaka, T.,Abe, K.,Hayato, Y.,Iida, T.,Kameda, J.,Koshio, Y.,Kouzuma, Y.,Miura, M.,Moriyama, S.,Nakahata, M.,Nakayama, S.,Obayashi, Y.,Sekiya, H.,Shiozawa, M.,Suzuki, Y.,Takeda, A.,Takenaga, Y.,Ueno, IOP Publishing 2011 The Astrophysical journal Vol.742 No.2
<P>We present the result of an indirect search for high energy neutrinos from Weakly Interacting Massive Particle (WIMP) annihilation in the Sun using upward-going muon (upmu) events at Super-Kamiokande. Data sets from SKI-SKIII (3109.6 days) were used for the analysis. We looked for an excess of neutrino signal from the Sun as compared with the expected atmospheric neutrino background in three upmu categories: stopping, non-showering, and showering. No significant excess was observed. The 90% C. L. upper limits of upmu flux induced by WIMPs of 100 GeV c(-2) were 6.4 x 10(-15) cm(-2) s(-1) and 4.0 x 10(-15) cm(-2) s(-1) for the soft and hard annihilation channels, respectively. These limits correspond to upper limits of 4.5 x 10(-39) cm(-2) and 2.7 x 10(-40) cm(-2) for spin-dependent WIMP-nucleon scattering cross sections in the soft and hard annihilation channels, respectively.</P>
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.
Test of Lorentz invariance with atmospheric neutrinos
Abe, K.,Haga, Y.,Hayato, Y.,Ikeda, M.,Iyogi, K.,Kameda, J.,Kishimoto, Y.,Miura, M.,Moriyama, S.,Nakahata, M.,Nakano, Y.,Nakayama, S.,Sekiya, H.,Shiozawa, M.,Suzuki, Y.,Takeda, A.,Tanaka, H.,Tomura, T. American Physical Society 2015 PHYSICAL REVIEW D - Vol.91 No.5