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YUTO MAEKAWA
In this poster, I report the efficient noise rejection method for improvement of a neutron tagging by developing photomultiplier tubes (PMTs) noise simulation with noise investigation.
Super-Kamiokande (Super-K) is a large water Cherenkov detector to observe Cherenkov rings by large aperture PMTs. The reconstruction performance can be degraded by a noise from a thermal electron and...
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Seidai Tairafune (Tohoku University)
T2K is a long-baseline neutrino oscillation experiment in Japan, with an accelerator and a near detector facility at J-PARC and the Super-Kamiokande far detector. The T2K experiment has measured neutrino oscillation parameters and is working towards the observation of CP violation in the leptonic sector. Furthermore, since high efficiency neutron tagging is now available with the Gd-loaded...
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Hikaru Tanigawa (KEK)
The T2K experiment is a long baseline neutrino oscillation experiment aiming to discover CP violation in neutrino mixing. A new detector, SuperFGD, will be installed in the near detector to reduce systematic errors in the neutrino oscillation analysis. It consists of about 2 million 1 cm scintillator cubes, about 56,000 wavelength shifting fibers penetrating them from three directions, and an...
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M. Shintaro Miki (Institute for Cosmic Ray Research, University of Tokyo)
Super-Kamiokande (SK) is the 50 kton water Cherenkov detector located at Kamioka mine in Japan. In 2020, we dissolved gadolinium sulfate in the SK water and started SK-Gd phase with 0.01% Gd, where neutron detection efficiency and resolution for neutron capture vertex are improved. Detection efficiency got even higher at the second Gd loading to 0.03% Gd in June 2022. In atmospheric neutrino...
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Takuro Fujino (Yokohama National University)No track
A half-wave plate (HWP) is often used as a modulator to suppress systematic error in cosmic microwave background (CMB) polarization measurements. An HWP can also be used to measure circular polarization through its optical leakage from circular to linear polarization. The circular polarization of the CMB is predicted to be produced by interactions in the Universe, such as interactions with...
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Koki Yamauchi (Tokyo University of Science)
It is important to measure neutrinos in the energy range from a few hundreds of MeV to several GeV for the study of neutrino oscillation by atmospheric neutrino observation and long baseline experiments. It is also important for proton decay search as the major background is atmospheric neutrinos in the energy region. In this intermediate energy region charged-current quasi-elastic scattering...
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Junna Sugiyama (the University of Tokyo)No track
Simons Observatory (SO) is the largest ground-based CMB experiment in history. SO is developing Small Aperture Telescopes (SATs) to detect the primordial B-mode signal. The cryogenic half-wave plate (CHWP) is an optical device for SAT which decreases systematic errors in the polarimetry. CHWP modulates polarized signals separating from unpolarized signals; the polarization modulation reduces...
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Ryogo Okubo
Scaling up the size and performance of particle detectors is necessary to explore the cutting edge of particle physics and nuclear physics. Common requirements for photodetectors used for such particle detectors are high time resolution, large detection area, and low cost.
To satisfy those requirements, we have developed a gaseous photodetector, GasPM. It consists of a photocathode, a...
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Dylan KUHNNo track
As of today, the Hubble diagram, which maps the luminosity distance-redshift relation for type-Ia supernovae (SNe Ia), allows us to infer cosmological parameters such as the Dark Energy equation of state (w) with an accuracy reaching a few per cent. Upcoming SNIa samples with O(30,000) SNe (30 times the current worldwide statistics), will allow us to reach the per cent level and start probing...
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Shoma Kodama (The University of Tokyo)No track
The T2K experiment showed the strongest constraint on the CP violation phase in the lepton sector using neutrino oscillation and is seeking further improvement of the measurement sensitivity. To reduce systematic uncertainties, upgrades of the near detector are ongoing. In 2023, a new type of detector, called SuperFGD, is planned to be installed. SuperFGD is a high granular scintillator...
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Junya Hikida (Kyoto univercity)No track
A Xenon Electroluminescence (AXEL) experiment aims to overcome the current limitations in the search for the neutrinoless double beta decay from $^{136}$Xe using high pressure gas xenon TPC. In order to read out ionized electrons, we are developing a unique readout system for the AXEL group, the electroluminescence light collection cell (ELCC). Ionized electrons are drifted to ELCC, and they...
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Yousuke Kataoka (The University of Tokyo, ICRR)
Hyper-Kamiokande starts its operation in 2027, and we are in the final stage of the development of the electronics. The large scale and high precision of the Hyper-Kamiokande require high performance and reliability on the electronics. We have developed frontend electronics such as digitizer, communication module and HV/LV module. And we plan to deploy the frontend electronics in water-tight...
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Miao Yu (Institue of High Energy Physics, Chinese Academy of Science)No track
Liquid scintillator (LS) detectors, composed of LS and photosensors, such as photomultiplier tubes (PMTs), have been widely used in neutrino experiments. Precise calibration of energy response (energy nonlinearity and energy resolution) for different particles in LS detectors is crucial for spectral analysis. For LS detectors used in reactor neutrino experiments, $e^+$ from the inverse beta...
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M. Naoya Kuroda (Kyoto University)No track
It has been theoretically shown that the integrated value of electron chirality density over the whole molecule is generally a nonzero value. The reaction rate of weak interactions is higher in one enantiomer than in the other due to the different number of left-handed electrons between the enantiomers. From this fact, a theory for the origin of homochirality, which is the enantiomeric excess...
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Wataru Okinaga
The T2K experiment aims to verify leptonic CP violation by precisely measuring the neutrino oscillation probability. From the previous data analysis, leptonic CP violation is confirmed at 95% C.L. To further improve the experiment sensitivity up to the 3σ C.L. a major accelerator upgrade has been done with the goal of increasing the neutrino beam intensity beyond 1 MW. Moreover, also the...
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Zhuojun Hu (Kyoto University)
Neutrinos, almost the smallest objects to our knowledge, however play an important role in the life of massive stars. As a massive star approaching core-collapse supernova, the rate of electron anti-neutrinos ($\bar{\nu}_e$) emission and the $\bar{\nu}_e$ energy are increasing. When such a pre-supernova (pre-SN) star enters the silicon burning phase, which is considered a few days preceding...
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M. Shota Izumiyama (Tokyo Institute of Technology)
We have upgraded the Super-Kamiokande in 2020 with Gd to enhance neutron tagging for anti- or normal-neutrino distinction. This neutron tagging method requires a special trigger and is limited to the higher energy of neutrino than around 8 MeV due to the energy of a 2.2 MeV gamma ray via hydrogen capture in the pure water phase. After the upgrade of doping Gd, this requirement is relaxed in...
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Masataka Shinoki (Tokyo University of Science)
We measured $^9\mathrm{Li}$ isotopic nuclei produced by muon spallation using the data taken from 2020 to 2022 by the Super-Kamiokande detector with 0.011% gadolinium concentration in water. $^9\mathrm{Li}$ is a long-lived radioactive isotope with a lifetime of about 0.26 seconds. It emits an electron and a neutron at a branching ratio of 50.8%, which is difficult to distinguish from the...
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Tomoaki Tada (Okayama Univ.)No track
Cosmic-ray muons are generated from the showers of secondary particles via the interactions of primary cosmic particles with air nuclei at the top of the atmosphere. Pions and kaons mostly decay into muons immediately, reflecting the details of the hadronic interactions depending on their energy. The charge ratio of the cosmic-ray muons can be used to constrain high energy hadronic interaction...
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Mlle Sakiko Nishimori (KEK), Prof. Takeshi Nakadaira (KEK)No track
T2K is a long baseline neutrino oscillation experiment and search for CP violation in leptons using neutrino oscillation.For improving the result, it is very important to consider about the neutrino flux in Super Kamiokande (SK). Neutrino flux estimation is using neutrino beam simulation and one of the largest effects of the flux uncertainty is the cooling water for the magnetic horn : the...
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Haruaki Hirose (Yokohama National University)No track
Observing the degree-scale polarization pattern called “B-mode” in the cosmic microwave background radiation (CMB) map is expected to be proof of primordial gravitational wave and a key to revealing the inflationary universe. Recently, CMB polarization observation experiments with higher experimental sensitivities are in progress or planned.
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For such precise CMB polarization observations, it... -
Hironobu Nakata (Kyoto University)Primordial Universe
Polarization of cosmic microwave background (CMB) is the best probe for primordial gravitational waves. In Simons Observatory, using the Sparse Wire Grid Calibrator, we can evaluate/reduce optical systematic errors on Small Aperture Telescopes (SATs). In this poster presentation, we will introduce an initial analysis for the optical performance of the calibrator
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Eiichiro Watanabe
Hyper-Kamiokande (HK) is the next-generation large-scale water
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Cherenkov detector currently under construction. It is planned to be
an order of magnitude bigger than its predecessor, Super-Kamiokande
(SK), and will house approximately 20,000 50-cm photomultiplier tubes
(PMT) in the inner detector. In order to calibrate the HK detector
precisely, it is necessary to understand the PMT... -
Kana Sakaguri (The University of Tokyo)No track
The cosmic microwave background (CMB) has a variety of information that is useful for understanding the early universe. The Simons Array, an ongoing ground-based CMB experiment, is located in the Atacama plateau in northern Chile. Its second telescope receiver has been installed and is being prepared at the site, including the set-up of the ambient temperature equipment and readout testing,...
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Eigo Shintani (Tsukuba University)Particle Physics
We report the recent lattice QCD result of proton decay matrix element, which is QCD contribution to baryon number violating process, with PACS collaboration. We compute 12 relevant matrix elements on the physical point in lattice QCD, and this regards a more reliable value compared with the previous one computed from chiral extrapolation. In this poster, we show the systematic study to...
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Masaki Kawaue (Kyoto U)No track
T2K is a long baseline neutrino oscillation experiment in Japan. We are constructing a new tracking detector SuperFGD which consists of 2 million plastic scintillator cubes. The detector will enable us to measure neutrino interactions more precisely.
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Approximately 55,000 wavelength shifting fibers are inserted into the cubes to read out the scintillation light. It is important to identify the... -
Dr Yuuki Nakano (Kamioka observatory)
Search for neutrinos produced during solar flares has been discussed for the last 60 years while clear signals of neutrinos associated with solar flares (solar flare neutrinos) have not been identified yet. Since neutrinos are not affected by the interplanetary magnetic field, solar flare neutrinos may give a hint of particle acceleration mechanism in solar flares. According to some...
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Nao Suzuki (Lawrence Berkeley National Laboratory)No track
Close White Dwarf Binary systems in Miky Way Galaxy are important in two major fields of astrophysics. 1) Potential source of background gravitational wave and 2) Potential progenitors of Type Ia supernovae.
1) Potential Source of Gravitational Wave Background
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Although the individual contribution is small, integrating numerous white dwarf systems may contribute to a gravitational wave... -
Jun Kameda (Institute for Cosmic ray research, The University of Tokyo)
Hyper-Kamiokande is a next generation water Cherenkov detector which has a fiducial volume of approximately 10 times larger than that of the on-going Super-Kamiokande detector.
In a deep water tank one of critical issue is prevention of chain implosion of large photosensors.
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If a glass bulb crashes under high pressure in deep water a rapid cracking run over the whole glass in very short... -
Shizuka Shima (Tokyo University)
Super-Kamiokande is the world's largest underground water Cherenkov detector placed 1000m underground in Kamioka. The experiment aims to observe neutrinos from various sources as well as nucleon decays. In 2020, the new phase of Super-Kamiokande, SK-Gd, was started by dissolving gadolinium to pure water to about 0.01% concentration. Furthermore, in 2022, additional gadolinium was introduced,...
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Dr César Jesús-Valls (Kavli IPMU)
The recent discovery of Coherent Elastic neutrino-Nucleus Scattering (CE$\nu$NS) has created new opportunities to detect and study neutrinos. The interaction cross-section in CE$\nu$NS scales quadratically with the number of neutrons, making heavy-nuclei targets attractive. Lead perovskites have emerged in the last decade as revolutionary materials for radiation detection due to their heavy...
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Suin Matsui (The University of Tokyo)No track
There is a positive correlation between the mass of SMBHs ($M_{\rm BH}$) and the stellar mass of their host galaxies ($M_{\rm star}$) in the local Universe, suggesting that SMBHs and galaxies have co-evolved. Studying distant galaxies is vital to understand the co-evolution process. Although it is difficult to measure $M_{\rm BH}$ in distant galaxies except for quasars, its time derivative,...
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Biagio De Simone (University of Salerno; INFN)No track
Gamma-Ray Bursts (GRBs) are very energetic cosmological transients. Long GRBs are usually associated with Type Ib/c Supernovae (SNe), and we refer to them as GRB-SNe. Since the associated SN for a given GRB is observed only at low redshift, a possible selection effect exists when we consider intrinsically faint sources which cannot be observed at high redshift. Thus, it is important to explore...
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