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The Hyper-Kamiokande Experiment -- Snowmass LOI
Kamiokande Collaboration, K. Abe, P. Adrich +387
Hyper-Kamiokande is the next generation underground water Cherenkov detector that builds on the highly successful Super-Kamiokande experiment. The detector which has an 8.4~times l…
Development of low-background photomultiplier tubes for liquid xenon detectors
XMASS Collaboration, K. Abe, Y. Chen +36
We successfully developed a new photomultiplier tube (PMT) with a three-inch diameter, convex-shaped photocathode, R13111. Its prominent features include good performance and ultra…
Design and Performance of a Silicon Tungsten Calorimeter Prototype Module and the Associated Readout
T. Awes, C. L. Britton, T. Chujo +41
We describe the details of a silicon-tungsten prototype electromagnetic calorimeter module and associated readout electronics. Detector performance for this prototype has been meas…
J-PARC Neutrino Beamline Upgrade Technical Design Report
K. Abe, H. Aihara, A. Ajmi +381
In this document, technical details of the upgrade plan of the J-PARC neutrino beamline for the extension of the T2K experiment are described. T2K has proposed to accumulate data c…
A measurement of the scintillation decay time constant of nuclear recoils in liquid xenon with the XMASS-I detector
XMASS Collaboration, K. Abe, K. Hiraide +35
We report an in-situ measurement of the nuclear recoil (NR) scintillation decay time constant in liquid xenon (LXe) using the XMASS-I detector at the Kamioka underground laboratory…
Development of low radioactivity photomultiplier tubes for the XMASS-I detector
XMASS Collaboration, K. Abe, K. Hiraide +39
XMASS-I is a single-phase liquid xenon detector whose purpose is direct detection of dark matter. To achieve the low background requirements necessary in the detector, a new model…
Hyper-Kamiokande Design Report
Hyper-Kamiokande Proto-Collaboration, :, K. Abe +313
On the strength of a double Nobel prize winning experiment (Super)Kamiokande and an extremely successful long baseline neutrino programme, the third generation Water Cherenkov dete…
Identification of Pb and Po in the bulk of copper samples with a low-background alpha particle counter
XMASS collaboration, K. Abe, K. Hiraide +39
We established a method to assay Pb and Po contaminations in the bulk of copper samples using a low-background alpha particle counter. The achieved sensitivity for…
A measurement of the time profile of scintillation induced by low energy gamma-rays in liquid xenon with the XMASS-I detector
XMASS Collaboration, H. Takiya, K. Abe +36
We report the measurement of the emission time profile of scintillation from gamma-ray induced events in the XMASS-I 832 kg liquid xenon scintillation detector. Decay time constant…
Detectability of galactic supernova neutrinos coherently scattered on xenon nuclei in XMASS
XMASS Collaboration
The coherent elastic neutrino-nucleus scattering (CEvNS) plays a crucial role at the final evolution of stars. The detection of it would be of importance in astroparticle physics.…
A Long Baseline Neutrino Oscillation Experiment Using J-PARC Neutrino Beam and Hyper-Kamiokande
Kamiokande Working Group, K. Abe, H. Aihara +245
Hyper-Kamiokande will be a next generation underground water Cherenkov detector with a total (fiducial) mass of 0.99 (0.56) million metric tons, approximately 20 (25) times larger…
Calibration of the Super-Kamiokande Detector
K. Abe, Y. Hayato, T. Iida +130
Procedures and results on hardware level detector calibration in Super-Kamiokande (SK) are presented in this paper. In particular, we report improvements made in our calibration me…
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…
Measurements of the T2K neutrino beam properties using the INGRID on-axis near detector
K. Abe, N. Abgrall, Y. Ajima +428
Precise measurement of neutrino beam direction and intensity was achieved based on a new concept with modularized neutrino detectors. INGRID (Interactive Neutrino GRID) is an on-ax…
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…
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…
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.) +…