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Search Results: 1 - 10 of 144476 matches for " F. Suekane "
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Status of KASKA: The Japanese Reactor $\sin^22θ_{13}$ Project
F. Suekane
Physics , 2004,
Abstract: Last year, in the NOON03 conference, we pointed out the importance of reactor $\sin^22\theta_{13}$ measurement and showed a realistic experimental idea to measure $\sin^22\theta_{13}$ precisely using world's most powerful reactor complex. Since then, the conceptual design of the experiment and negotiations with electric power company, have been progressing. In this proceedings for the NOON04 conference, the present status of the proposed experiment, now called KASKA, is described.
A Global Fit Determination of Effective $\Delta m_{31}^2$ from Baseline Dependence of Reactor $\bar{\nu}_e$ Disappearances
Bezerra, T. J. C.;Furuta, H.;Suekane, F.;Matsubara, T.
High Energy Physics - Phenomenology , 2013,
Abstract: Recently, three reactor neutrino experiments, Daya Bay, Double Chooz and RENO have directly measured the neutrino mixing angle $\theta_{13}$. In this paper, another important oscillation parameter, effective $\Delta m_{31}^2$ (= $\Delta \tilde{m}_{31}^2$) is measured using baseline dependence of the reactor neutrino disappearances. A global fit is applied to publicly available data and $\Delta \tilde{m}_{31}^2 = 2.95^{+0.59}_{-1.07} \times 10^{-3}$ eV$^2$, $\sin^22\theta_{13} = 0.099^{+0.024}_{-0.018}$ are obtained by setting both parameters free. This result is complementary to $\Delta tilde{m}_{31}^2$ to be measured by spectrum shape analysis. The measured $\Delta \tilde{m}_{31}^2$ is consistent with $\Delta \tilde{m}_{32}^2$ measured by $\nu_{\mu}$ disappearance in MINOS, T2K and atmospheric neutrino experiments within errors. The minimum $\chi^2$ is small, which means the results from the three reactor neutrino experiments are consistent with each other.
Online monitoring system and data management for KamLAND
M. Motoki,F. Suekane,K. Tada,Y. Tsuda
Physics , 2004, DOI: 10.1016/j.nima.2004.07.059
Abstract: In January 22, 2002, KamLAND started the data-taking. The KamLAND detector is a complicated system which consists of liquid scintillator, buffer oil, spherical balloon and so on. In order to maintain the detector safety, we constructed monitoring system which collect detector status information such as balloon weight, liquid scintillator oil level and so on. In addition, we constructed continuous Rn monitoring system for the $^7$Be solar neutrino detection. The KamLAND monitoring system consists of various network, LON, 1-Wire, and TCP/IP, and these are indispensable for continuous experimental data acquisition.
Reactor Measurement of $θ_{13}$ and Its Complementarity to Long-Baseline Experiments
H. Minakata,H. Sugiyama,O. Yasuda,K. Inoue,F. Suekane
Physics , 2002, DOI: 10.1103/PhysRevD.70.059901
Abstract: A possibility to measure $\sin^22\theta_{13}$ using reactor neutrinos is examined in detail. It is shown that the sensitivity $\sin^22\theta_{13}>0.02$ can be reached with 20 ton-year data by placing identical CHOOZ-like detectors at near and far distances from a giant nuclear power plant whose total thermal energy is 24.3 ${\text{GW}_{\text{th}}}$. It is emphasized that this measurement is free from the parameter degeneracies which occur in accelerator appearance experiments, and therefore the reactor measurement plays a role complementary to accelerator experiments. It is also shown that the reactor measurement may be able to resolve the degeneracy in $\theta_{23}$ if $\sin^22\theta_{13}$ and $\cos^22\theta_{23}$ are relatively large.
Measurement of Effective $Δm_{31}^2$ using Baseline Differences of Daya Bay, RENO and Double Chooz Reactor Neutrino Experiments
T. J. C. Bezerra,H. Furuta,F. Suekane
Physics , 2012,
Abstract: In 2011 and 2012, three reactor neutrino experiments, Double Chooz, Daya Bay and RENO showed positive signals of reactor neutrino disappearance and measured a mixing parameter sin^2(2th13) at average baselines 1.05, 1.65 and 1.44km, respectively. It is possible to measure effective Dm31^2 from distortion of neutrino energy spectrum (E dependence of the oscillation) in those experiments. However, since it requires a precise energy calibration, such measurements have not been reported yet. Dm31^2 can also be measured from baseline (L) dependence of the neutrino oscillation. In this paper, Dm31^2 is measured from disappearance probabilities of the three reactor experiments which have different baselines, to be 2.99^{+1.13}_{-1.58}(^{+0.86}_{-0.88}) X 10^{-3}eV^2, where the errors are two (one) dimensional uncertainties. This is consistent with Dm32^2 measured by \nu_{\mu} disappearance in accelerator experiments. Importance of Dm31^2 measurement and future possibilities are also discussed.
A Global Fit Determination of Effective $Δm_{31}^2$ from Baseline Dependence of Reactor $\barν_e$ Disappearance
T. J. C. Bezerra,H. Furuta,F. Suekane,T. Matsubara
Physics , 2013, DOI: 10.1016/j.physletb.2013.07.028
Abstract: Recently, three reactor neutrino experiments, Daya Bay, Double Chooz and RENO have directly measured the neutrino mixing angle $\theta_{13}$. In this paper, another important oscillation parameter, effective $\Delta m_{31}^2$ (= $\Delta \tilde{m}_{31}^2$) is measured using baseline dependence of the reactor neutrino disappearance. A global fit is applied to publicly available data and $\Delta \tilde{m}_{31}^2 = 2.95^{+0.42}_{-0.61} \times 10^{-3}$ eV$^2$, $\sin^22\theta_{13} = 0.099^{+0.016}_{-0.012}$ are obtained by setting both parameters free. This result is complementary to $\Delta tilde{m}_{31}^2$ to be measured by spectrum shape analysis. The measured $\Delta \tilde{m}_{31}^2$ is consistent with $\Delta \tilde{m}_{32}^2$ measured by $\nu_{\mu}$ disappearance in MINOS, T2K and atmospheric neutrino experiments within errors. The minimum $\chi^2$ is small, which means the results from the three reactor neutrino experiments are consistent with each other.
Precise measurement of $\sin^22θ_{13}$ using Japanese Reactors
F. Suekane,K. Inoue,T. Araki,K. Jongok
Physics , 2003,
Abstract: After the KamLAND results, the remaining important targets in neutrino experiments are to measure still unknown 3 basic parameters; absolute neutrino mass scale, CP violation phase $\delta_{CP}$ and last mixing angle $\theta_{13}$. The angle $\theta_{13}$ among them is expected to be measured in near future by long baseline accelerator experiments and reactor experiments. In this paper, a realistic idea of high sensitivity reactor measurement of $\sin^22\theta_{13}$ is described. This experiment uses a giant nuclear power plant as the neutrino source and three identical detectors are used to cancel detector and neutrino flux uncertainties. The sensitivity reach on $\sin^22\theta_{13}$ is $0.017\sim0.026$ at $\Delta m^2_{13} \sim 3 \times 10^{-3}eV^2$, which is five to seven times better than the current upper limit measured by CHOOZ.
Effect of Heterogeneity of Porous Media on Gas Permeation and Entrapment  [PDF]
Yohei Mikami, Yoshihiro Deguchi, Tetsuya Suekane
Journal of Flow Control, Measurement & Visualization (JFCMV) , 2014, DOI: 10.4236/jfcmv.2014.23013
Abstract: Capillary trapping prevents the migration of CO2 in reservoirs due to buoyancy. The residual gas saturation is strongly influenced by the gas saturation after gas injection. In this study, we have investigated the effect of stratified structure of heterogeneous porous media on gas permeation and entrapment. Experiments were carried out at a laboratory condition for a nitrogen-water system with the packed beds of glass beads with various diameters which modeled stratified porous media. In the case of parallel structure, the injected gas selectively percolated into permeable layers. The gas permeation can hardly occur for the less permeable layers because of the capillary entrance pressure. In the case of serial structure, the interface of porous structure hindered the migration of gas across it, because of the capillary entrance pressure. When the gas percolated in the permeable layers, capillary fingering was developed in the layers. However, when the tip of finger reached the interface, fingers grew in tangential directions until the pressure built up to overcome the capillary entrance pressure. As a result, high gas saturation was achieved in the permeable layers of both upward and downward gas injections.
An Overview of the KamLAND 1-kiloton Liquid Scintillator
F. Suekane,T. Iwamoto,H. Ogawa,O. Tajima,H. Watanabe,for the KamLAND RCNS Group
Physics , 2004,
Abstract: KamLAND is a massive liquid-scintillator-based neutrino detector studying low energy neutrino oscillation. The experiment has discovered a large deficit of the reactor neutrino flux with baseline of 180km in the year 2002. This result is placing a strong impact on the elementary particle physics. The KamLAND detector makes use of one kiloton of liquid scintillator (LS) as the active neutrino target. This is the largest homogeneous LS detector in the world. Although the light yield and attenuation length of the LS were measured to be 57% anthracene and ~10m, in the test experiments, when it is used in the KamLAND detector, the effective transparency and light yield significantly increased from these values, presumably due to the scattering and re-emission in the large scale LS. The radio active contamination in the LS is extremely low, such as 3.5E-18g/g for uranium. This is the world's lowest contamination record so far achieved and measured. The success of the KamLAND experiment is a fruit of this high-quality and large-quantity LS. In this proceedings, an outline of the LS is described.
A simple model of reactor cores for reactor neutrino flux calculations for the KamLAND experiment
K. Nakajima,K. Inoue,K. Owada,F. Suekane,A. Suzuki,G. Hirano,S. Kosaka,T. Ohta,H. Tanaka
Physics , 2006, DOI: 10.1016/j.nima.2006.09.088
Abstract: KamLAND is a reactor neutrino oscillation experiment with a very long baseline. This experiment successfully measured oscillation phenomena of reactor antineutrinos coming mainly from 53 reactors in Japan. In order to extract the results, it is necessary to accurately calculate time-dependent antineutrino spectra from all the reactors. A simple model of reactor cores and code implementing it were developed for this purpose. This paper describes the model of the reactor cores used in the KamLAND reactor analysis.
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