Showing papers by "K. Nishikawa published in 2021"
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Osaka University1, University of Michigan2, Dongshin University3, Chonnam National University4, Soongsil University5, Tohoku University6, Kyung Hee University7, Japan Atomic Energy Agency8, Gwangju Institute of Science and Technology9, Sungkyunkwan University10, Seoul National University of Science and Technology11, Kitasato University12, Chonbuk National University13, Kyungpook National University14, Kyoto Sangyo University15, University of Sussex16, University of Florida17, University of Utah18, University of Alabama19, Brookhaven National Laboratory20
21 Oct 2021-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: The JSNS 2 (J-PARC Sterile Neutrino Search at J-Parc Spallation Neutron Source) experiment aims to search for oscillations involving a sterile neutrino in the eV 2 mass-splitting range.
Abstract: The JSNS 2 (J-PARC Sterile Neutrino Search at J-PARC Spallation Neutron Source) experiment aims to search for oscillations involving a sterile neutrino in the eV 2 mass-splitting range. The experiment will search for the appearance of electron antineutrinos oscillated from muon antineutrinos. The electron antineutrinos are detected via the inverse beta decay process using a liquid scintillator detector. A 1 MW beam of 3 GeV protons incident on a spallation neutron target produces an intense and pulsed neutrino source from pion , muon, and kaon decay at rest. The JSNS 2 detector is located 24 m away from the neutrino source and began operation from June 2020. The detector contains 17 tonnes of gadolinium (Gd) loaded liquid scintillator (LS) in an acrylic vessel, as a neutrino target. It is surrounded by 31 tonnes of unloaded LS in a stainless steel tank. Optical photons produced in LS are viewed by 120 R7081 Hamamatsu 10-inch Photomultiplier Tubes (PMTs). In this paper, we describe the JSNS 2 detector design, construction, and operation.
9 citations
TL;DR: In this paper, the D'Agostini unfolding method was used to obtain the cross-sections of the water and hydrocarbon targets using the T2K anti-neutrino beam, with mean neutrino energy of 0.86 GeV.
Abstract: We report measurements of the flux-integrated $\bar{
u}_\mu$ and $\bar{
u}_\mu+
u_\mu$ charged-current cross-sections on water and hydrocarbon targets using the T2K anti-neutrino beam, with a mean neutrino energy of 0.86 GeV. The signal is defined as the (anti-)neutrino charged-current interaction with one induced $\mu^\pm$ and no detected charged pion nor proton. These measurements are performed using a new WAGASCI module recently added to the T2K setup in combination with the INGRID Proton module. The phase space of muons is restricted to the high-detection efficiency region, $p_{\mu}>400~{\rm MeV}/c$ and $\theta_{\mu} 200~{\rm MeV}/c$ and $\theta_{\pi} 600~{\rm MeV}/c$ and $\theta_{\rm p}<70^{\circ}$" is required. In this paper, both of the $\bar{
u}_\mu$ cross-sections and $\bar{
u}_\mu+
u_\mu$ cross-sections on water and hydrocarbon targets, and their ratios are provided by using D'Agostini unfolding method. The results of the integrated $\bar{
u}_\mu$ cross-section measurements over this phase space are $\sigma_{\rm H_{2}O}\,=\,(1.082\pm0.068(\rm stat.)^{+0.145}_{-0.128}(\rm syst.)) \times 10^{-39}~{\rm cm^{2}/nucleon}$, $\sigma_{\rm CH}\,=\,(1.096\pm0.054(\rm stat.)^{+0.132}_{-0.117}(\rm syst.)) \times 10^{-39}~{\rm cm^{2}/nucleon}$, and $\sigma_{\rm H_{2}O}/\sigma_{\rm CH} = 0.987\pm0.078(\rm stat.)^{+0.093}_{-0.090}(\rm syst.)$. The $\bar{
u}_\mu+
u_\mu$ cross-section is $\sigma_{\rm H_{2}O} = (1.155\pm0.064(\rm stat.)^{+0.148}_{-0.129}(\rm syst.)) \times 10^{-39}~{\rm cm^{2}/nucleon}$, $\sigma_{\rm CH}\,=\,(1.159\pm0.049(\rm stat.)^{+0.129}_{-0.115}(\rm syst.)) \times 10^{-39}~{\rm cm^{2}/nucleon}$, and $\sigma_{\rm H_{2}O}/\sigma_{\rm CH}\,=\,0.996\pm0.069(\rm stat.)^{+0.083}_{-0.078}(\rm syst.)$.
8 citations
5 citations
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27 Apr 2021-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: The JSNS^2 (J-PARC Sterile Neutrino Search at JPARC Spallation Neutron Source) experiment aims to search for sterile neutrino oscillations in the eV mass range.
Abstract: The JSNS^2 (J-PARC Sterile Neutrino Search at J-PARC Spallation Neutron Source) experiment aims to search for sterile neutrino oscillations in the eV mass range. A 1 MW beam of 3 GeV protons incident on a spallation neutron target produces an intense and pulsed neutrino beam from muon decay at rest. The JSNS^2 detector is located at 24 m away from the neutrino source and began operation from June, 2020. The detector contains 17 tonnes of gadolinium (Gd) loaded liquid scintillator (LS) in an acrylic vessel, as a neutrino target. It is surrounded by 31 tonnes of unloaded LS in a stainless steel tank. Optical photons produced in LS are viewed by 120 R7081 Hamamatsu 10-inch Photomultiplier Tubes (PMTs). In this paper, we describe the JSNS^2 detector design, construction, and operation.
2 citations
KEK1, Osaka University2, University of Michigan3, Dongshin University4, Chonnam National University5, Soongsil University6, Tohoku University7, Kyung Hee University8, Japan Atomic Energy Agency9, Gwangju Institute of Science and Technology10, Sungkyunkwan University11, Seoul National University of Science and Technology12, Kitasato University13, Chonbuk National University14, Kyungpook National University15, Kyoto Sangyo University16, University of Sussex17, University of Florida18, University of Alabama19, Brookhaven National Laboratory20
TL;DR: The slow control and monitoring system (SCMS) was implemented for reliable control and quick monitoring of the neutrino detector operational status and environmental conditions as discussed by the authors, which issues an alarm if any of the monitored parameters exceed a preset acceptable range.
Abstract: The JSNS$^2$ experiment is aimed to search for sterile neutrino oscillations using a neutrino beam from muon decays at rest. The JSNS$^2$ detector contains 17 tons of 0.1\\% gadolinium (Gd) loaded liquid scintillator (LS) as a neutrino target. Detector construction was completed in the spring of 2020. A slow control and monitoring system (SCMS) was implemented for reliable control and quick monitoring of the detector operational status and environmental conditions. It issues an alarm if any of the monitored parameters exceed a preset acceptable range. The SCMS monitors the high voltage (HV) of the photomultiplier tubes (PMTs), the LS level in the detector, possible LS overflow and leakage, the temperature and air pressure in the detector, the humidity of the experimental hall, and the LS flow rate during filling and extraction. An initial 10 days of data-taking with a neutrino beam was done following a successful commissioning of the detector and SCMS in June 2020. In this paper, we present a description of the assembly and installation of the SCMS and its performance.