Mr
Kento Asai
12/21/20, 9:50 AM
Prof.
Akito Kusaka
(The University of Tokyo / Lawrence Berkeley National Laboratory)
12/21/20, 10:20 AM
Prof.
Makoto Hattori
(Astronomical Institute, Tohoku University)
12/21/20, 10:30 AM
Prof.
Naoyuki Haba
(Shimane university)
12/21/20, 11:10 AM
口頭発表（公募研究）
We study the grand unified theory (GUT) and the generation structure
of elementary particles, using neutrinos as a probe. We primarily
focus on the possibility that the suppression of "dimension-5 proton
decays" (proton decays via colored Higgsino exchange, which are too
fast if supersymmetric particles are at TeV scale) in supersymmetric
SO(10) GUT is realized with a unique flavor...
Osamu Seto
(Hokkaido University)
12/21/20, 11:35 AM
口頭発表（公募研究）
The breaking of the U(1) symmetry is a source of stochastic gravitational wave (GW) background. We show a successful ultraviolet completion of a U(1) extended SM by an SO(10) grand unified model through an intermediate step of SU(5)×U(1) unification.
Dr
Hironao Miyatake
(Nagoya University)
12/21/20, 12:00 PM
口頭発表（公募研究）
The large-scale structure of the Universe, such as the abundance of galaxy clusters and the matter correlation function, is sensitive to the total neutrino mass, and thus serve as the independent probe from CMB fluctuations. As a first step, we measure dark matter distributions of distant objects detected by the Subaru Hyper Suprime-Cam (HSC); the one is galaxy clusters at z~1, and the other...
Masaki Ishitsuka
(Tokyo University of Science)
12/21/20, 1:30 PM
yosuke suzuki
(Nagoya Univ.)
12/21/20, 3:15 PM
ポスター発表（若手セッション）
NINJA実験は原子核乾板を用いたニュートリノ-原子核反応の精密測定実験であり、物理ランでは2019年末から2020年始にかけて75kg水標的検出器に対し0.48×10^21POTのニュートリノ照射を行った。
本実験で用いている検出器である水ECCは、2mmの水と原子核乾板を用いたトラッキングプレートを積層した構造をしている。
その高い位置分解能、高サンプリングレートを生かして、低速陽子の検出が可能であることが大きな特徴である(陽子検出閾値>200MeV/c)。
物理ランでは9個のECCを作成し、ニュートリノ照射を行ったが、今回は1個のECCでの解析状況について報告する。
Naoki Yamatsu
(Kyushu University)
12/21/20, 3:15 PM
ポスター発表（若手セッション）
Grand unification is one of the most attractive ideas for constructing unified theories beyond the standard model (SM). As is well-known in SO(10) and E(6) GUTs, the SM quarks and leptons are embedded into one unified multiple. So, a part of baryon (B) and lepton (L) numbers, i.e., B-L, is a part of the GUT gauge group. The B and L symmetries play a crucial role of understanding low-energy...
Dr
Masashi Nashimoto
(NAOJ)
12/21/20, 3:15 PM
ポスター発表（若手セッション）
Observation of the Cosmic Microwave Background radiation (CMB) B-mode polarization aims at measuring the neutrino mass and detecting primordial gravitational waves. Since the CMB B-mode signals are embedded in emission from interstellar dust in the Milky Way, the dust emission must be removed from the CMB data. To improve the accuracy of component separation between the CMB and the dust...
Mr
Soichiro Kuribayashi
(Kyoto University)
12/21/20, 3:15 PM
ポスター発表（若手セッション）
Super FGD is a part of the near detector (ND280) upgrade of the T2K experiment. This upgrade is to reduce the systematic uncertainty for the measurement of the neutrino oscillation parameters. The Super FGD consists of about two million scintillator cubes read out along three orthogonal directions by wavelength shifting fibers, to realize large acceptance and fine granularity. We develop the...
Mr
Masashi Yoshida
(Kyoto University)
12/21/20, 3:15 PM
ポスター発表（若手セッション）
ニュートリノがマヨラナ粒子であるか否かを検証すべく, ニュートリノを伴わない二重ベータ崩壊($0\nu\beta\beta$)の探索が世界中で行われている.
稀事象である$0\nu\beta\beta$を高感度で探索するためには, 大量の崩壊核・高いエネルギー分解能・背景事象の除去, の3点を全て達成することが重要であり, 我々はこの要件を全て満たす検出器として, 高圧キセノンガスタイムプロジェクションチェンバーであるAXELを開発している.
$^{136}$Xeの$0\nu\beta\beta$におけるQ値2458 keVでのエネルギー分解能や飛跡再構成能力などの検出器性能を実証するため, 我々は現在容積180 Lの試作機を開発し, ガンマ線源を用いた性能評価を行なっている.
本講演では, 性能評価に至るまでの開発の試行錯誤と,...
Dr
Shunsuke Adachi
(Kyoto University)
12/21/20, 3:15 PM
ポスター発表（若手セッション）
In millimeter-wave measurements, recent super-conducting detectors achieve high sensitive detection of the millimeter-wave. In order to achieve further sensitivity in the millimeter waves, the reduction of stray light becomes essential. For instance, in the cosmic microwave background (CMB) observation, we need to suppress the radiation noise coming from the outside of the telescope like...
Takuto Suganuma
(Tokyo University of Science)
12/21/20, 3:15 PM
ポスター発表（若手セッション）
Hyper-Kamiokande is a next generation water Cherenkov detector and will start operation in 2027. Cherenkov light emitted from charged particles produced from proton decay and neutrino interactions are detected by photo multiplier tubes (PMT). High voltage (HV) is necessary device for PMT to accelerate electrons between the dynodes. With the current plan, HV will be set in water proof case...
Ms
Yume Nishinomiya
(University of Tokyo)
12/21/20, 3:15 PM
ポスター発表（若手セッション）
To study the initial conditions and evolution of the universe, we measure Cosmic Microwave Background (CMB) polarization. The telescopes for the CMB observation have over 10,000 Transition Edge Sensor (TES) detectors, which can detect faint signals sensitively. We aim to evaluate the thermal and optical performance of many TES detectors simultaneously, which are developed for the...
Ms
Stephany Elizabeth Vargas Piedra
(Chiba University)
12/21/20, 3:15 PM
ポスター発表（若手セッション）
The IceCube Neutrino Observatory, located at the geographic South Pole, will deploy 300 next-generation optical modules, known as D-Eggs, for the detector upgrade. Each one of these D-Egg modules contains two photomultiplier tubes (PMTs) as their primary sensors. Each PMT receives power through a high voltage (HV) base, which contains a high voltage transformer toroid used as a highpass...
Mr
Lukas Berns
(Tokyo Inst. of Tech, Hyper Kamiokande collaboration)
12/21/20, 3:15 PM
ポスター発表（若手セッション）
We present initial developments of machine learning based ring event reconstruction for water Cherenkov detectors, in particular the Intermediate Water Cherenkov Detector proposed as near detector for the HyperK experiment. By exploiting PMT hit correlations due to shower- or scattering-induced variations in the Cherenkov profile, as well as additional spatial and directional information from...
Toshi Sumida
(Kyoto University)
12/21/20, 3:15 PM
ポスター発表（若手セッション）
We report on new ideas of an experiment to search for dark-photon cold dark matter (DP-CDM) in the mass region of 10^-4 eV, applying the method used to measure the CMB anisotropy. Photons from the conversion from DPs on a metal plate, in the millimeter wave range (10-18 GHz), will be searched with three antennas in order to make this measurement sensitive to the polarization and velocity...
Dr
Akira Harada
(ICRR)
12/21/20, 3:50 PM
ポスター発表（若手セッション）
大質量星の死である重力崩壊型超新星はニュートリノ加熱によって爆発すると考えられている。そこではニュートリノ輸送が重要な役割を果たすため、我々はボルツマン方程式を直接解くニュートリノ輻射流体コードを開発した。本講演では、これを用いて高速回転する親星の重力崩壊をシミュレーションした結果を概説し、放射されるニュートリノの性質について議論する。
Mr
Tomokazu Matsuo
(Nagoya University)
12/21/20, 3:50 PM
ポスター発表（若手セッション）
This test beam experiment is designed to study detection and momentum measurements of electron which optimised for NINJA water-ECC and Iron-ECC.
Water-ECC, iron-ECC and stacked nuclear emulsion plates were irradiated by an electron beam with 150, 300, 500 and 800 MeV/c of energy at angle from 0 to 79degree in GeV-gamma room in ELPH in Tohoku University.
We will give an overview of the...
Kyohei Yamada
(The university of Tokyo)
12/21/20, 3:50 PM
ポスター発表（若手セッション）
For polarization measurements of the cosmic microwave background that probe the physics of the inflationary period, it is important to reduce low-frequency noise and systematic contamination by polarization modulation. For the Simons Observatory experiment, we are developing a large aperture cryogenic continuously rotating half-wave plate (HWP) that is magnetically levitated on a...
Dr
Junya Suzuki
(Kyoto University)
12/21/20, 3:50 PM
ポスター発表（若手セッション）
Superconducting detectors have been widely applied to scientific instruments, including CMB polarimeters, X-ray telescopes, and dark matter detectors. Multiplexing readout is a key for those applications to operate more detectors while suppressing heat transfer to the superconducting device from warmer stages. RF multiplexing uses superconducting resonators to map detectors in frequency space,...
Mr
Yoshinori SUENO
(Kyoto University)
12/21/20, 3:50 PM
ポスター発表（若手セッション）
Superconducting devices are getting adopted in CMB and dark matter search experiments.
MKID has intrinsically breakthrough potential to realize frequency domain multiplexing over 1000 pixels.
However, there are a few places where we can characterize the MKID because superconducting detectors are typically operated at O(10-100) mK.
We have developed the characterization system for the...
Masaki Kawaue
(Kyoto University)
12/21/20, 3:50 PM
ポスター発表（若手セッション）
We are developing a new near detector SuperFGD in T2K experiment. This detector is constructed from about 2 million scintillator cubes and their scintillation light are led by inserted WLS fibers.
It is necessary to check the fibers are not damaged by pressure of cubes. We are developing a fiber test system which does not require light shielding, and evaluating the precision.
Masataka Shinoki
(Tokyo University of Science)
12/21/20, 3:50 PM
ポスター発表（若手セッション）
Position dependence of the energy scale is one of the major systematic error sources in the solar neutrino analysis in Super-Kamiokande. In the low energy analysis, the energy of a charged particle is reconstructed with the number of hit PMTs after some corrections. In the latest study, we succeeded in suppressing the position dependence of the energy reconstruction by the modification of the...
Mariko Suzuki
(Chiba Univ.)
12/21/20, 3:50 PM
ポスター発表（若手セッション）
現在千葉大学では、IceCube Upgrade計画におけるニュートリノ観測および南極氷河光伝搬較正のための光検出器「D-Egg」の実機300台の製作を行っており、2022年末に南極氷河に埋設される予定である。さらに10,000台規模での新型光検出器の埋設を目指すIceCube Gen2計画に向け、このD-Eggを高エネルギーニュートリノ点源観測に向けて最適化した次世代光検出器「mEgg」のデザイン研究が進行している。本ポスターでは、Geant4を基盤としたモンテカルロシミュレーションを用いて、実際の南極環境におけるmEggの検出効率を見積もり、その結果と現D-Eggとの比較についてを報告する。
Mr
Shumpai Kotaka
(Kyoto Univ.)
12/21/20, 3:50 PM
ポスター発表（若手セッション）
“Dark photon'' is one of the candidates of cold dark matter. There are models which predict tiny conversion from the dark photons to the standard model photons at the surface of the metal plate. DOSUE-RR (Dark-photon Observing System at Un-Explored Radio-Range) is an experiment to search for the conversion photon in the K-band millimeter-wave range (20~30 GHz). The corresponding mass range for...
Hina Nakamura
(TUS)
12/21/20, 3:50 PM
ポスター発表（若手セッション）
T2K実験ではミューオンモニターによりスピルごとにビームの方向を測定している。ミューオンモニターに設置する新しい検出器の候補の一つとしてCTが検討されている。CTは通過する正負の荷電粒子数の差に比例した信号が得られるため、正負の荷電粒子の和に比例した信号が得られるSi検出器の測定と合わせることにより、ミューオンビームの方向だけでなく、正負の荷電粒子数の比率にも感度を持つ。本講演では、測定精度をビームシミュレーションにより評価した結果を報告する。
Dr
Yuki Sakurai
(Kavli IPMU)
12/21/20, 3:50 PM
ポスター発表（若手セッション）
The Simons Observatory will precisely observe cosmic microwave background (CMB) using the world’s largest CMB telescope arrays. Our science goals are the most precise measurements of cosmological parameters obtained from polarization patterns in CMB, such as tensor-to-scalar ratio, a sum of neutrino mass, and so on. Towards the first light in FY2021, constructions are going on. The Japanese...
Dr
Hiroki Rokujo
(Nagoya University)
12/21/20, 4:25 PM
ポスター発表（若手セッション）
We started up a precise gamma-ray observation project, Gamma-Ray Astro-Imager with Nuclear Emulsion (GRAINE), using balloon-borne emulsion gamma-ray telescopes to enable high angular resolution, polarization-sensitive, and large-aperture observations in the 0.01–100 GeV energy region. In 2018, we conducted the balloon experiment (GRAINE 2018) and succeeded in the first detection of a celestial...
Mr
Masaaki Murata
(The University of Tokyo)
12/21/20, 4:25 PM
ポスター発表（若手セッション）
We will report the development of the sparse wire grid calibrator for the Simons Observatory(SO) experiment. In the SO experiment, we aim to detect a B-mode polarized signal of the cosmic microwave background. The B-mode polarized signal contains the signature of the primordial gravitational wave generated at the inflation era. To measure the B-mode polarized signal with σ(r)=0.003 accuracy,...
Mr
Yuto Maekawa
(Keio Univ.)
12/21/20, 4:25 PM
ポスター発表（若手セッション）
In neutrino experiments, photomultiplier tubes (PMTs) in water or liquid scintillators are frequently used to measure a signal of light. Dark pulses of the PMTs are an important background which affects low energy measurements. It is known that the dark pulse rate depends on temperature and magnitude of the electric-field around the photo cathode. To find optimal settings in the actual...
Koki Yamauchi
(Tokyo University of Science)
12/21/20, 4:25 PM
ポスター発表（若手セッション）
The Hyper-Kamiokande experiment is planned to start in 2027 aiming for precise measurement of neutrino oscillation using J-PARC neutrino beam including the search for CP violation. Intermediate Water Cherenkov Detector (IWCD) based on detection principle as Hyper-Kamiokande is proposed to reduce the systematic uncertainty in the long baseline measurement. Water Cherenkov Test Experiment (WCTE)...
Dr
Aine Kobayashi
(KEK)
12/21/20, 4:25 PM
ポスター発表（若手セッション）
The transverse impedance, known to cause betatron tune shift and beam instability, has a significant impact on the beam operation at the J-PARC main ring (MR). Its estimations and countermeasures are indispensable for higher beam intensity from current intensity of 3.3\times 10^{13} ppb (protons per bunch) \times 8 bunches to future intensity of 4.4\times 10^{13} ppb \times 8 bunches. Beam...
Yuya Takemasa
(Chiba University)
12/21/20, 4:25 PM
ポスター発表（若手セッション）
南極氷河で宇宙から飛来するニュートリノを観測するIceCube実験では、ニュートリノ観測の高精度化を目指しIceCube-Upgrade計画が進行中である。本計画で新たに埋設される新型光検出器D-Egg約300台の内部に設置されている12個の較正用LED及びその高速パルス駆動回路を用いることで、南極氷河の光伝搬特性をより詳細に理解する。光伝搬特性を詳細に調べるためにはこのD-Egg内部のLEDシステムの性能理解が必須であり、そのための光度及び指向特性の計測システムを開発した。本講演ではこの計測システム及びそれを用いた測定結果について報告する。
Shunsuke Honda
(Kyoto University)
12/21/20, 4:25 PM
ポスター発表（若手セッション）
GroundBIRD is a millimeter-wave telescope to observe the polarization patterns of the cosmic microwave background (CMB).
The target science topics are primordial gravitational waves from cosmic inflation and reionization optical depth.
Therefore, this telescope is designed to achieve the highest sensitivity at large angular scales, $\ell =$ 6 - 300.
For wide sky observations ($\sim 40\%$...
Tatsushi Kinoshita
(TUS)
12/21/20, 4:25 PM
ポスター発表（若手セッション）
ニュートリノ振動の測定精度向上を目的としてJ-PARCニュートリノビームライン上に建設される前置検出器には、3インチPMTを19本組み合わせたマルチPMTが導入される予定である。マルチPMTは現在開発の最終段階であり、大量生産の前にPMTの基本性能を把握しておく必要がある。本研究では3インチPMTのアフターパルス(遅延信号)などの測定結果を報告する。
Hyper-Kamiokande is the next generation underground water Cherenkov detector, aiming for the precision measurement such as long baseline neutrino oscillation. To suppress the systematic uncertainty, 1kton scale...
Mr
Ryo Matsumoto
(Tokyo University of Science)
12/21/20, 4:25 PM
ポスター発表（若手セッション）
核子崩壊は大統一理論の検証につながる非常に重要な事象であり、スーパーカミオカンデ実験では様々な崩壊モードが探索されている。
本研究では陽子がミューオンと中性K中間子に崩壊するモード($p\to \mu^++K^0$)についての探索を目的としている。
$K^0$は$K^0_L$による長寿命の崩壊モードを有しており、陽子崩壊による$\mu$の発生点と$K^0_L$の崩壊点が離れる事象が現れる。
本発表では時間的に離れた崩壊事象を分離するよう改良した再構成アルゴリズムと今後の解析予定について述べる。
Mr
Takahiro Odagawa
(Kyoto University)
12/21/20, 4:25 PM
ポスター発表（若手セッション）
NINJA experiment measures neutrino-nucleus interactions with nuclear emulsion detector called Emulsion Cloud Chamber.
Thanks to its fine granularity and good spatial resolution, it allows us to detect short range charged particles’ tracks from the interactions.
From November 2019 to February 2020, we accumulated $\sim 4.7 \times 10^{21}$ protons on target neutrino beam in the detector.
We...
Mr
Tomoki Terasaki
(the University of Tokyo)
12/21/20, 4:25 PM
ポスター発表（若手セッション）
To reduce statistic noise of the Cosmic Microwave Background observation, it is important to increase the number of detectors. In the Simons Observatory, the microwave SQUID multiplexing (uMUX) are used. I report the result of measurement of noise level of the uMUX module.
Mr
YOHAN LEE
(Kyoto University)
12/21/20, 5:00 PM
ポスター発表（若手セッション）
現在J-PARC MRにはビームの大強度化に合わせ、新しいビームプロファイルモニターである16電極ビームモニターがインストールされている。16電極ビームモニターは非破壊型を採用することによりモニター自身によるビームロスを軽減し、大強度のビームの環境下で精度良くビームのプロファイル測定が可能になるのを目標としている。このビームモニターの開発の現状と現在新しく導入しようとしているアルゴリズムについて報告する。
Mr
Yasutsugu Morii
(Chiba University)
12/21/20, 5:00 PM
ポスター発表（若手セッション）
IceCube-Upgrade project is underway for a more detailed understanding of lower-energy neutrino events and light propagation characteristics in glaciers. In this project, in order to improve the light detection efficiency in all directions, D-Egg in which two photodetectors are put in one glass container is used. We are proceeding with mass production of this D-Egg front-end DAQ board, and...
Mr
Hussain Kitagawa
(Okayama Univ.)
12/21/20, 5:00 PM
ポスター発表（若手セッション）
In the Super-Kamiokande detector, decay electrons from cosmic ray muons are continuously observed at the rate of approximately 1,500 event per day. Decay electrons enable the SK detector to monitor the water transparency and to evaluate its energy scale. The SK-Gd project in which Gd sulfate is loaded into pure water as a new target started from July 2020 and it is expected that water...
Mr
shunsuke fujigami
(Tokyo Institute of Technology Kuze group)
12/21/20, 5:00 PM
ポスター発表（若手セッション）
It has been suggested to use retro-reflectors to improve precision of Water Cherenkov detector like Super-Kamiokande or Hyper-Kamiokande. Here we study the impact on reconstruction of low-energy(<10MeV) neutrino events. We tested performance of retro-reflectors by optical measurement. We introduced its result in simulation, developed reconstruction tool, and studied improvement of position resolution.
Ms
Chiori Fujisawa
(Keio University)
12/21/20, 5:00 PM
ポスター発表（若手セッション）
Hyper-Kamiokande is aiming at high-precision measurement of neutrinos. However, output of 20-inch photomultiplier tubes is not linearly amplified in a certain range of the amount of incident light. The output nonlinearity was measured with the photomultiplier tube used in Hyper-Kamiokande. It depended on bias voltage and bleeder circuit. In order to suppress these effects, we improved the...
Hiiragi Inamoto
(Nagoya-university)
12/21/20, 5:00 PM
ポスター発表（若手セッション）
NINJA実験はニュートリノと原子核との反応の精密測定を目的とした実験である。
現在我々はNINJAのテスト実験としてRUN9を2月末から3月末にニュートリノビームを照射する為の準備を進めている。
RUN9の主な目的は2つある。一つは新開発の原子核乾板検出器を設置し、その結果を今後の実験にフィードバックすること。もう一つはこの実験は主に大学生及び大学院生が主導となって行い、経験を積むということである。
現在主に原子核乾板フィルムの作成及び試験、飛跡の時間記録用のシフターの試験を行っており、その開発の改良を行いながら進めている。
Kana Sakaguri
(UTokyo)
12/21/20, 5:00 PM
ポスター発表（若手セッション）
Cosmic Microwave Background (CMB) polarization experiments require high accuracy. Sapphire, used for Half-Wave plates which is one of the optical elements of the telescopes, has high index (~3.1) and high reflectivity. This can cause errors, so we need to reduce reflectance by coating with anti-reflection (AR) coatings. AR coatings can reduce systematic errors as well as statistical errors by...
Ms
Tamaki Murokoshi
(Tohoku univ.)
12/21/20, 5:00 PM
ポスター発表（若手セッション）
Recently Nashimoto, Hattori, Chinone has shown that the interstellar extinction of CMB monopole have non negligible effect on high precision measurements of CMB polarization and temperature anisotropy. They named the effect as CMB shadow since it looks like a shadow by the sunlight of a plastic sheet. However, their analysis was limited to an order of magnitude estimation. Therefore, more ...
Tatsuya Kikawa
(Kyoto University)
12/21/20, 5:00 PM
ポスター発表（若手セッション）
We are now developing a new T2K near detector, Super-FGD.
The Super-FGD consists of about two million plastic scintillator cubes read out along three orthogonal directions by wavelength shifting fibers and MPPCs.
This detector will provide the large acceptance as well as the low momentum threshold for the detection of charged particles from neutrino interactions.
However, it can provide the...
Dr
Kazufumi Sato
(ISEE, Nagoya University)
12/22/20, 9:10 AM
Roger Wendell
(Kyoto University)
12/22/20, 9:40 AM
Dr
Hiromasa Takaura
(KEK)
12/22/20, 10:40 AM
Dr
Shintaro Eijima
12/22/20, 10:55 AM
Dr
Osamu Sato
(Nagoya University)
12/22/20, 11:50 AM
Dr
Hiroki Rokujo
(Nagoya University)
12/22/20, 12:00 PM
Mr
Sei Ban
(Kyoto University)
12/22/20, 12:20 PM
Dr
Masato Senami
(Kyoto University), Mr
Naoya Kuroda
(Kyoto University)
12/22/20, 1:50 PM
ポスター発表（公募研究）
Our group proposed and study a scenario to explain the origin of homochirality
by the difference of the weak interaction reaction rate between enantiomers of amino acid molecules.
Biological molecules on the Earth have strong imbalance between enantiomers;
amino acid molecules are L-type enantiomers
and sugar molecueles are D-type ones.
In our previous work, the total electron chirality...
Dr
Morihiro Honda
(ICRR university of Tokyo)
12/22/20, 1:50 PM
ポスター発表（公募研究）
A progress report to study of low energy atmospheric neutrino flux below 100 MeV is presented. The study here is for the neutrino produced by the decay atmospheric muon in the materials at the surface of the earth, including the neutrino from the muon capture by nucleus. These fluxes are relatively small compared with the neutrinos produced in the atmosphere in all direction average. However,...
Dr
Toru Sato
(Osaka University, RCNP)
12/22/20, 1:50 PM
ポスター発表（公募研究）
We report on our recent results of the neutrino interaction
in the resonance region.
1) Role of the axial vector form factor of resonance.
We examined the transition form factor of nucleon resonances by using
the analyss of electron scattering data. We found increased strength
neutrino cross section with large Q2 in the higher resonance region.
(Collaborato S. X. Nakamura)
2)...
Prof.
Hirokazu Ishino
(Okayama University)
12/22/20, 1:50 PM
ポスター発表（公募研究）
We present our development of superconducting detectors for neutrino physics. One of our aims is to develop an In target detector for electron neutrino detections. Three technologies need to be newly developed: an In target that can be connected to the superconducting detectors, the superconducting detectors, and the coupling between them. So far we have developed the first two items. In the...
Dr
Takehiko Asaka
(Niigata University)
12/22/20, 1:50 PM
We discuss the lepton flavor model with modular symmetry in the torus
compactification.
Especially, we propose a model with modular A4 symmetry which works in
the so-called large volume limit.
In this model a gauge singlet field is introduced in order to explain
the origins of the Higgs mu term as well as the Majorana masses for
right-handed neutrinos.
It is then presented the...
Dr
Yoshinori Kurimoto
(KEK/J-PARC)
12/22/20, 1:50 PM
ポスター発表（公募研究）
In high-intensity proton synchrotrons, beam optics parameters must be precisely controlled
to minimize beam losses. Central orbit distortion, which is called COD, is one of such important parameters. When CODs are large at sextupole magnets, additional focusing (de-focusing) forces are produced. These forces distort a betatron tune, which is defined as
a number of oscillations per one turn...
Dr
Hiraki Takahiro
(Okayama University)
12/22/20, 1:50 PM
ポスター発表（公募研究）
We, the SPAN (SPectroscopy with Atomic Neutrino) collaboration, aims to uncover unknown neutrino properties such as absolute neutrino masses and the nature of neutrino masses, Majorana/Dirac distinction. To obtain information on neutrino properties, we uses a decay process from metastable state(s) of atoms or molecules with emission of a neutrino pair. One of the most serious problem when we...
Susumu Oda
(Kyushu University)
12/22/20, 1:50 PM
ポスター発表（公募研究）
Models with addition of three right-handed neutrinos to the Standard Model can explain the big three questions of the universe, neutrino masses, asymmetry between matter and anti-matter, dark matter.
Neutrino Minimal Standard Model ($\nu$MSM) is one of such models and predicts three right-handed neutrinos with sizable masses, as known as Heavy Neutral Leptons (HNLs).
HNLs with masses of...
Mr
Seisho Abe
(Tohoku University)
12/22/20, 1:50 PM
ポスター発表（公募研究）
T2K experiment which is a long-baseline neutrino oscillation experiment in Japan
is measuring CP-violation phase, $\delta_{CP}$.
This experiment generates neutrino beam at J-PARC in Ibaraki prefecture and detects it at Super-Kamiokande in Kamioka-mine, Gifu prefecture.
Since Super-Kamiokande is a water-Cherenkov detector, it cannot detect low energy events whose energy is below Cherenkov...
Prof.
Masamitsu Tanaka
(Nagoya University)
12/22/20, 1:50 PM
ポスター発表（公募研究）
Measurement of the angular correlation between neutrino and electron in beta decay is a good probe of the validity of the Standard Model. The actual experiments rely on the measurement of the precise energy spectrum of the recoil proton, whose energy ranges up to 700 eV. It is challenging to measure such small energy particles directly using conventional detectors. This study aims to discuss...
Dr
Takashi Iida
(University of Tsukuba)
12/22/20, 1:50 PM
ポスター発表（公募研究）
The water Cherenkov detectors, such as Kamiokande and Super-Kamiokande, have led the study of neutrinos so far, as seen in the observation of supernova neutrinos and discovery of neutrino oscillations. In the next-generation neutrino experiment, a large-scale scintillator experiment of the same size as Super-Kamiokande is necessary. Because organic scintillators are toxic and flammable, we are...
Dr
Yosui Akaike
(Waseda University)
12/22/20, 3:00 PM
口頭発表（公募研究）
CALETは国際宇宙ステーションにおける高エネルギー宇宙線の直接観測実験であり、2015年10月から現在まで順調に観測を継続している。検出器はTeV領域の電子観測に最適化した30放射長の物質量をもつ解像型のカロリメータで、宇宙線近傍加速源や暗黒物質の探索を主目的としている。さらに、陽子・原子核成分の高精度なエネルギースペクトルの観測を通じて、宇宙線の加速・伝播機構の解明を目指している。本講演では、これまでの約5年間の観測で得られた観測結果、特に宇宙線原子核成分の観測結果について報告する。
Ryogo Okubo
(Nagoya University)
12/22/20, 3:25 PM
口頭発表（公募研究）
GasPMは大規模素粒子実験の発展を加速させるために発明された安価かつ大型なガス増倍を用いた高時間分解能光検出器である。この検出器は現在開発の初期段階で、我々は試作機を用いて高時間分解能であることを実証することを目指しており、そのために基本動作を理解する必要がある。
検出器の時間分解能は信号のS/N比で決まるため、信号の増倍率を最大化する必要がある。私は、検出器の増倍率の印加電圧依存性、光子検出レート依存性を測定した。
印加電圧については3kVの時に増倍率が最大となり、それ以上の印加電圧では増倍率が低下することを明らかとした。光子検出レートは1Hzの時に増倍率が最大となり、それ以上の検出レートとすると検出器内部に増幅された電子が蓄積され、電場が低下することで増倍率が低下することが明らかとなった。これは試作器特有の性質であり、この影響が小さい1Hz程度のヒットレートで評価をすること...
Prof.
Yoshiyuki Fukuda
(Miyagi University of Education)
12/22/20, 3:50 PM
口頭発表（公募研究）
ZICOS is one of future project of Neutrinoless double beta decay search using a liquid scintillator containing $^{96}$Zr. In order to achieve the sensitivity over $10^{27}$ years, ZICOS will use tons of $^{96}$Zr, and need to remove $^{208}$Tl backgrounds efficiently. For this purpose, we have developed new technique to distinguish signal and background using a topological information of...
Dr
Kazunori Kohri
(KEK / Sokendai)
12/22/20, 4:15 PM
口頭発表（公募研究）
From a theoretical point of view, there is a strong motivation to consider an MeV-scale reheating temperature induced by long-lived massive particles with masses around the weak scale, decaying only through gravitational interaction. In this study, we investigate lower limits on the reheating temperature imposed by big-bang nucleosynthesis assuming both radiative and hadronic decays of such...
Dr
Tomo Takahashi
(Saga University)
12/22/20, 4:40 PM
口頭発表（公募研究）
It is now widely recognized that the value of the Hubble-Lemaitre constant measured by cosmic microwave background (CMB) is in strong tension with the one obtained from local direct measurements, which is called the $H_0$ tension. Since CMB is now the most powerful cosmological probe of neutrino masses and $H_0$ is correlated with neutrino masses in CMB, one can expect that the $H_0$ tension...
Dr
Yuji Omura
(Kindai)
12/22/20, 5:05 PM
口頭発表（公募研究）
We explore a novel possibility that dark matter has a light mass below 1GeV in a lepton portal dark matter model. There are Yukawa couplings involving dark matter, left-handed leptons and an extra scalar doublet in the model. In the light mass region, dark matter is thermally produced via its annihilation into neutrinos. In order to obtain the correct relic abundance and avoid collider bounds,...
