Publications (35)
Search for Low-energy Electron Antineutrinos in KamLAND Associated with Gravitational Wave Events
S. Abe, S. Asami, A. Gando +65
We present the results of a search for MeV-scale electron antineutrino events in KamLAND in coincident with the 60 gravitational wave events/candidates reported by the LIGO/Virgo c…
7Be Solar Neutrino Measurement with KamLAND
A. Gando, Y. Gando, H. Hanakago +68
We report a measurement of the neutrino-electron elastic scattering rate of 862 keV 7Be solar neutrinos based on a 165.4 kton-day exposure of KamLAND. The observed rate is 582 +/-…
Search for Solar Flare Neutrinos with the KamLAND detector
S. Abe, S. Asami, A. Gando +65
We report the result of a search for neutrinos in coincidence with solar flares from the GOES flare database. The search was performed on a 10.8 kton-year exposure of KamLAND colle…
Electroluminescence collection cell as a readout for a high energy resolution Xenon gas TPC
S. Ban, K. D. Nakamura, S. Akiyama +10
AXEL is a high pressure xenon gas TPC detector being developed for neutrinoless double-beta decay search. We use the proportional scintillation mode with a new electroluminescence…
Search for the Majorana Nature of Neutrinos in the Inverted Mass Ordering Region with KamLAND-Zen
Zen Collaboration, S. Abe, S. Asami +70
The KamLAND-Zen experiment has provided stringent constraints on the neutrinoless double-beta () decay half-life in Xe using a xenon-loaded liquid scintillator. We…
KamLAND Sensitivity to Neutrinos from Pre-Supernova Stars
K. Asakura, A. Gando, Y. Gando +44
In the late stages of nuclear burning for massive stars ($M>8~M_{\sun}$), the production of neutrino-antineutrino pairs through various processes becomes the dominant stellar cooli…
White paper: CeLAND - Investigation of the reactor antineutrino anomaly with an intense 144Ce-144Pr antineutrino source in KamLAND
A. Gando, Y. Gando, S. Hayashida +57
We propose to test for short baseline neutrino oscillations, implied by the recent reevaluation of the reactor antineutrino flux and by anomalous results from the gallium solar neu…
Atmospheric neutrino oscillation analysis with sub-leading effects in Super-Kamiokande I, II, and III
Kamiokande Collaboration, R. Wendell, C. Ishihara +117
We present a search for non-zero theta_{13} and deviations of sin^2 theta_{23} from 0.5 in the oscillations of atmospheric neutrino data from Super-Kamiokande -I, -II, and -III. No…
XMASS detector
K. Abe, K. Hieda, K. Hiraide +45
The XMASS project aims to detect dark matter, pp and Be solar neutrinos, and neutrinoless double beta decay using ultra pure liquid xenon. The first phase of the XMASS experi…
CeLAND: search for a 4th light neutrino state with a 3 PBq 144Ce-144Pr electron antineutrino generator in KamLAND
A. Gando, Y. Gando, S. Hayashida +63
The reactor neutrino and gallium anomalies can be tested with a 3-4 PBq (75-100 kCi scale) 144Ce-144Pr antineutrino beta-source deployed at the center or next to a large low-backgr…
Study of electron anti-neutrinos associated with gamma-ray bursts using KamLAND
K. Asakura, A. Gando, Y. Gando +45
We search for electron anti-neutrinos () from long and short-duration gamma-ray bursts~(GRBs) using data taken by the KamLAND detector from August 2002 to June 2013.…
Distillation of Liquid Xenon to Remove Krypton
K. Abe, J. Hosaka, T. Iida +45
A high performance distillation system to remove krypton from xenon was constructed, and a purity level of Kr/Xe = was achieved. This development is crucia…
Solar neutrino results in Super-Kamiokande-III
K. Abe, Y. Hayato, T. Iida +120
The results of the third phase of the Super-Kamiokande solar neutrino measurement are presented and compared to the first and second phase results. With improved detector calibrati…
AXEL: High-pressure Xe gas TPC for BG-free decay search
S. Obara, S. Ban, M. Hirose +15
AXEL is a high-pressure xenon gas time projection chamber for neutrinoless double-beta decay (0n2b) search. The AXEL has a unique readout system called ELCC which has a cellular st…
Angular dependence of columnar recombination in high pressure xenon gas using time profile of scintillation emission
K. D. Nakamura, S. Ban, M. Hirose +8
The angular dependence of the columnar recombination in xenon gas, if observed for low energy nuclear tracks, can be used for a direction-sensitive dark matter search. We measured…
Search for Differences in Oscillation Parameters for Atmospheric Neutrinos and Antineutrinos at Super-Kamiokande
Kamiokande Collaboration, K. Abe, Y. Hayato +109
We present a search for differences in the oscillations of antineutrinos and neutrinos in the Super-Kamiokande -I, -II, and -III atmospheric neutrino sample. Under a two-flavor dis…
A Search for Charged Excitation of Dark Matter with the KamLAND-Zen Detector
S. Abe, S. Asami, A. Gando +68
There are many theories where a dark matter particle is part of a multiplet with an electrically charged state. If WIMP dark matter () is accompanied by a charged excited s…
Search for solar axions in XMASS, a large liquid-xenon detector
K. Abe, K. Hieda, K. Hiraide +43
XMASS, a low-background, large liquid-xenon detector, was used to search for solar axions that would be produced by bremsstrahlung and Compton effects in the Sun. With an exposure…
Limits on Majoron-emitting double-beta decays of Xe-136 in the KamLAND-Zen experiment
Zen Collaboration, A. Gando, Y. Gando +37
We present limits on Majoron-emitting neutrinoless double-beta decay modes based on an exposure of 112.3 days with 125 kg of Xe-136. In particular, a lower limit on the ordinary (s…
Search for n-nbar oscillation in Super-Kamiokande
Kamiokande collaboration, K. Abe, Y. Hayato +135
A search for neutron-antineutron () oscillation was undertaken in Super-Kamiokande using the 1489 live-day or neutron-year exposure data. This proc…
Light WIMP search in XMASS
K. Abe, K. Hieda, K. Hiraide +43
A search for light dark matter using low-threshold data from the single phase liquid xenon scintillation detector XMASS, has been conducted. Using the entire 835 kg inner volume as…
Scintillation yield of liquid xenon at room temperature
K. Ueshima, K. Abe, T. Iida +41
The intensity of scintillation light emission from liquid xenon at room temperature was measured. The scintillation light yield at 1 deg. was measured to be 0.64 +/- 0.02 (stat.) +…
Search for double-beta decay of 136Xe to excited states of 136Ba with the KamLAND-Zen experiment
Zen Collaboration, K. Asakura, A. Gando +42
A search for double-beta decays of 136Xe to excited states of 136Ba has been performed with the first phase data set of the KamLAND-Zen experiment. The 0+1, 2+1 and 2+2 transitions…
Search for GUT Monopoles at Super-Kamiokande
Kamiokande Collaboration, K. Ueno, K. Abe +109
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,…
Study of Non-Standard Neutrino Interactions with Atmospheric Neutrino Data in Super-Kamiokande I and II
G. Mitsuka, K. Abe, Y. Hayato +104
In this paper we study non-standard neutrino interactions as an example of physics beyond the standard model using atmospheric neutrino data collected during the Super-Kamiokande I…
Search for electron antineutrinos associated with gravitational wave events GW150914 and GW151226 using KamLAND
KamLAND Collaboration, A. Gando, Y. Gando +45
We present a search for low energy antineutrino events coincident with the gravitational wave events GW150914 and GW151226, and the candidate event LVT151012 using KamLAND, a kilot…
Design and performance of a high-pressure xenon gas TPC as a prototype for a large-scale neutrinoless double-beta decay search
S. Ban, M. Hirose, A. K. Ichikawa +16
A high-pressure xenon gas time projection chamber, with a unique cellular readout structure based on electroluminescence, has been developed for a large-scale neutrinoless double-b…
Self-shielding effect of a single phase liquid xenon detector for direct dark matter search
A. Minamino, K. Abe, Y. Ashie +41
Liquid xenon is a suitable material for a dark matter search. For future large scale experiments, single phase detectors are attractive due to their simple configuration and scalab…
A Search for Nucleon Decay via and in Super-Kamiokande
Kamiokande Collaboration, K. Abe, Y. Hayato +111
We present the results of searches for nucleon decay via bound neutron to antineutrino plus pizero and proton to antineutrino plus piplus using data from a combined 172.8 kiloton-y…
The nylon balloon for xenon loaded liquid scintillator in KamLAND-Zen 800 neutrinoless double-beta decay search experiment
Zen collaboration, Y. Gando, A. Gando +70
The KamLAND-Zen 800 experiment is searching for the neutrinoless double-beta decay of Xe by using Xe-loaded liquid scintillator. The liquid scintillator is enclosed…
An Indirect Search for WIMPs in the Sun using 3109.6 days of upward-going muons in Super-Kamiokande
Kamiokande Collaboration, T. Tanaka, K. Abe +110
We present the result of an indirect search for high energy neutrinos from WIMP annihilation in the Sun using upward-going muon (upmu) events at Super-Kamiokande. Datasets from SKI…
Scintillation-only Based Pulse Shape Discrimination for Nuclear and Electron Recoils in Liquid Xenon
K. Ueshima, K. Abe, K. Hiraide +34
In a dedicated test setup at the Kamioka Observatory we studied pulse shape discrimination (PSD) in liquid xenon (LXe) for dark matter searches. PSD in LXe was based on the observa…
Search for Nucleon Decay into Charged Anti-lepton plus Meson in Super-Kamiokande I and II
Kamiokande Collaboration, H. Nishino, K. Abe +105
Searches for a nucleon decay into a charged anti-lepton (e^+ or μ^+) plus a light meson (Ï^0, Ï^-, η, Ï^0, Ï^-, Ï) were performed using the Super-Kamiokande I and II data. T…
A compact ultra-clean system for deploying radioactive sources inside the KamLAND detector
T. I. Banks, S. J. Freedman, J. Wallig +54
We describe a compact, ultra-clean device used to deploy radioactive sources along the vertical axis of the KamLAND liquid-scintillator neutrino detector for purposes of calibratio…
Limits on astrophysical antineutrinos with the KamLAND experiment
S. Abe, S. Asami, A. Gando +66
We report on a search for electron antineutrinos () from astrophysical sources in the neutrino energy range 8.3 to 30.8 MeV with the KamLAND detector. In an exposure of 6…