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Excavation of a 69-m diameter and 94-m high cavern for the Hyper-Kamiokande detector
Y. Asaoka, H. Tanaka, S. Nakayama +14
The excavation of the Hyper-Kamiokande cavern, 600 m underground, is complete. Measuring 69 m in diameter and 94 m in height, it is among the world's largest rock caverns. A vertic…
Second gadolinium loading to Super-Kamiokande
K. Abe, C. Bronner, Y. Hayato +246
The first loading of gadolinium (Gd) into Super-Kamiokande in 2020 was successful, and the neutron capture efficiency on Gd reached 50\%. To further increase the Gd neutron capture…
Scintillator ageing of the T2K near detectors from 2010 to 2021
The T2K Collaboration, K. Abe, N. Akhlaq +355
The T2K experiment widely uses plastic scintillator as a target for neutrino interactions and an active medium for the measurement of charged particles produced in neutrino interac…
First Gadolinium Loading to Super-Kamiokande
K. Abe, C. Bronner, Y. Hayato +212
In order to improve Super-Kamiokande's neutron detection efficiency and to thereby increase its sensitivity to the diffuse supernova neutrino background flux, 13 tons of $\rm Gd_2(…
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…
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…
Evaluation of Gadolinium's Action on Water Cherenkov Detector Systems with EGADS
Ll. Marti, M. Ikeda, Y. Kato +65
Used for both proton decay searches and neutrino physics, large water Cherenkov (WC) detectors have been very successful tools in particle physics. They are notable for their large…
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…
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…
Letter of Intent to Construct a nuPRISM Detector in the J-PARC Neutrino Beamline
S. Bhadra, A. Blondel, S. Bordoni +47
As long-baseline neutrino experiments enter the precision era, the difficulties associated with understanding neutrino interaction cross sections on atomic nuclei are expected to l…
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…
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…
High-speed charge-to-time converter ASIC for the Super-Kamiokande detector
H. Nishino, K. Awai, Y. Hayato +7
A new application-specific integrated circuit (ASIC), the high-speed charge-to-time converter (QTC) IWATSU CLC101, provides three channels, each consisting of preamplifier, discrim…
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.) +…