Kei Ieki

Profile Information

J-GLOBAL ID: 201901009536258046
researchmap Member ID: B000355011

Research Interests

Research Areas

Natural sciences / Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics / Particle physics

Research History

Nov, 2021 - Present

Assitant professor, Kamioka Observatory, The University of Tokyo

Education

Apr, 2008 - Mar, 2014

Faculty of Science, Kyoto University Graduate School
Apr, 2004 - Mar, 2008

Faculty of Science, Kyoto University
Apr, 2001 - Mar, 2004

Kawagoe High School

Awards

Nov, 2015

Breakthrough Prize, Breakthrough Prize Foundation

Kei Ieki, K, K collaboration
Mar, 2015

High Energy Physics Young Researcher's Award, Japan Association of High Energy Physicists

Kei Ieki
Mar, 2015

Young Scientist Award of the Physical Society of Japan, Physical Society of Japan

Kei Ieki
Mar, 2014

Springer thesis award, Springer

Kei Ieki

Papers

Search for Astrophysical Electron Antineutrinos in Super-Kamiokande with 0.01% Gadolinium-loaded Water

Masayuki Harada, Abe, K., Christophe Bronner, Yoshinari Hayato, Katsuki Hiraide, Keishi Hosokawa, Kei Ieki, Motoyasu Ikeda, Kameda, J., Kanemura, Y. …

Astrophys.J.Lett., 951(2) L27-L27, Jul 7, 2023 Peer-reviewed
Measurement of the cosmogenic neutron yield in Super-Kamiokande with gadolinium loaded water

M. Shinoki, K. Abe, Y. Hayato, K. Hiraide, K. Hosokawa, K. Ieki, M. Ikeda, J. Kameda, Y. Kanemura, R. Kaneshima …

Physical Review D, 107(9), May 18, 2023
Novel X-ray scanning technique for in-situ alignment of photo-detectors in the MEGII calorimeter

T. Libeiro, W. Kyle, S. Kobayashi, M. Francesconi, L. Galli, K. Ieki, T. Iwamoto, W. Molzon, T. Mori, M. Nakao …

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1048, Mar, 2023
Search for Cosmic-Ray Boosted Sub-GeV Dark Matter Using Recoil Protons at Super-Kamiokande

K. Abe, Y. Hayato, K. Hiraide, K. Ieki, M. Ikeda, J. Kameda, Y. Kanemura, R. Kaneshima, Y. Kashiwagi, Y. Kataoka …

Physical Review Letters, 130(3), Jan 18, 2023
Search for proton decay via <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mo stretchy="false">→</mml:mo><mml:msup><mml:mi>μ</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>K</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:math> in 0.37 megaton-years exposure of Super-Kamiokande

R. Matsumoto, K. Abe, Y. Hayato, K. Hiraide, K. Ieki, M. Ikeda, J. Kameda, Y. Kanemura, R. Kaneshima, Y. Kashiwagi …

Physical Review D, 106(7), Oct 10, 2022
Searching for Supernova Bursts in Super-Kamiokande IV

M. Mori, K. Abe, Y. Hayato, K. Hiraide, K. Ieki, M. Ikeda, S. Imaizumi, J. Kameda, Y. Kanemura, R. Kaneshima …

The Astrophysical Journal, 938(1) 35-35, Oct 1, 2022
Neutron tagging following atmospheric neutrino events in a water Cherenkov detector

K. Abe, Y. Haga, Y. Hayato, K. Hiraide, K. Ieki, M. Ikeda, S. Imaizumi, K. Iyogi, J. Kameda, Y. Kanemura …

Journal of Instrumentation, 17(10) P10029-P10029, Oct 1, 2022
Pre-supernova Alert System for Super-Kamiokande

L. N. Machado, K. Abe, Y. Hayato, K. Hiraide, K. Ieki, M. Ikeda, J. Kameda, Y. Kanemura, R. Kaneshima, Y. Kashiwagi …

The Astrophysical Journal, 935(1) 40-40, Aug 1, 2022
The Search for μ→eγ with 10-14 Sensitivity: The Upgrade of the MEG Experiment

Alessandro M. Baldini, Vladimir Baranov, Michele Biasotti, Gianluigi Boca, Paolo W. Cattaneo, Gianluca Cavoto, Fabrizio Cei, Marco Chiappini, Gianluigi Chiarello, Alessandro Corvaglia …

Symmetry, 13(9) 1591-1591, Aug 29, 2021
Search for lepton flavour violating muon decay mediated by a new light particle in the MEG experiment

A. M. Baldini, F. Berg, M. Biasotti, G. Boca, P. W. Cattaneo, G. Cavoto, F. Cei, M. Chiappini, G. Chiarello, C. Chiri …

European Physical Journal C, 80(9), Sep 1, 2020
Optimal design of plastic scintillator counter with multiple SiPM readouts for best time resolution

Onda R, Ieki K, Iwamoto T, Kobayashi S, Matsuzawa N, Mori Toshinori, Nakao M, Nishimura M, Ogawa S, Ootani W …

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 936 563-564, Aug 21, 2019 Peer-reviewed
Precise measurement of 3D-position of SiPMs in the liquid xenon gamma-ray detector for the MEGII experiment

Kobayashi Satoru, Francesconi Marco, Galli Luca, Ieki Kei, Iwamot Toshiyuki, Libeiro Terence, Matsuzawa Nobuo, Molzon William, Mori Toshinori, Nakao Mitsutaka …

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 936 189-191, Aug 21, 2019 Peer-reviewed
MEG II 実験ー分岐比10-14台でのμ+ → e+ γ崩壊探索―

内山雄祐, 家城佳

高エネルギーニュース, 37(1) 1-10, May, 2018 Peer-reviewedInvited
Development of large area UV-sensitive MPPCs to detect scintillation light from liquid xenon

Toshiyuki Iwamoto, Kei Ieki, Shinji Ogawa, Daisuke Kaneko, Wataru Ootani, Ryu Sawada

2014 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2014, Mar 10, 2016 Peer-reviewed
Upper bound on neutrino mass based on T2K neutrino timing measurements

Abe, K., Adam, J., Aihara, H., Akiri, T., Andreopoulos, C., Aoki, S., Ariga, A., Assylbekov, S., Autiero, D., Barbi, M. …

Phys.Rev.D, 93(1) 012006-012006, Jan 27, 2016 Peer-reviewed
Measurement of absorption and charge exchange of π+ on carbon

K. Ieki, E. S. Pinzon Guerra, S. Berkman, S. Bhadra, C. Cao, P. De Perio, Y. Hayato, M. Ikeda, Y. Kanazawa, J. Kim …

Physical Review C - Nuclear Physics, 92(3), Sep 17, 2015 Peer-reviewed
Development of deep-UV sensitive MPPC for liquid xenon scintillation detector

W. Ootani, K. Ieki, T. Iwamoto, D. Kaneko, T. Mori, S. Nakaura, M. Nishimura, S. Ogawa, R. Sawada, N. Shibata …

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 787 220-223, Jul 1, 2015 Peer-reviewed
S pi RIT: A time-projection chamber for symmetry-energy studies

R. Shane, A. B. McIntosh, T. Isobe, W. G. Lynch, H. Baba, J. Barney, Z. Chajecki, M. Chartier, J. Estee, M. Famiano …

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 784 513-517, Jun, 2015
Supernova Relic Neutrino Search with Neutron Tagging at Super-Kamiokande-IV

Zhang, H., Abe, K., Hayato, Y., Iyogi, K., Kameda, J., Kishimoto, Y., Miura, M., Moriyama, S., Nakahata, M., Nakano, Y. …

Astropart.Phys., 60 41-46, Jan, 2015 Peer-reviewed
Search for Trilepton Nucleon Decay via p -> e(+)vv and p -> mu(+)vv in the Super-Kamiokande Experiment

V. Takhistov, K. Abe, Y. Haga, Y. Hayato, M. Ikeda, K. Iyogi, J. Kameda, Y. Kishimoto, M. Miura, S. Moriyama …

PHYSICAL REVIEW LETTERS, 113(10) 1-6, Sep, 2014 Peer-reviewed

Misc.

Using world charged pion--nucleus scattering data to constrain an intranuclear cascade model

E. S. Pinzon Guerra, C. Wilkinson, S. Bhadra, S. Bolognesi, J. Calcutt, P. de Perio, S. Dolan, T. Feusels, G. A. Fiorentini, Y. Hayato …

Phys. Rev. D 99, 052007 (2019), Dec 18, 2018
Large-Area MPPC with Enhanced VUV Sensitivity for Liquid Xenon Scintillation Detector

K. Ieki, T. Iwamoto, D. Kaneko, S. Kobayashi, N. Matsuzawa, T. Mori, S. Ogawa, R. Onda, W. Ootani, R. Sawada …

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 925 148-155, Sep 24, 2018
The design of the MEG II experiment: MEG II Collaboration

A. M. Baldini, E. Baracchini, C. Bemporad, F. Berg, M. Biasotti, G. Boca, P. W. Cattaneo, G. Cavoto, F. Cei, M. Chiappini …

European Physical Journal C, 78(5), May 1, 2018
Atmospheric neutrino oscillation analysis with external constraints in Super-Kamiokande I-IV

Abe, K., Bronner, C., Haga, Y., Hayato, Y., Ikeda, M., Iyogi, K., Kameda, J., Kato, Y., Kishimoto, Y., Marti, Ll. …

Phys.Rev.D, 97(7) 072001-072001, Apr 3, 2018
Measurement of the single $\pi^0$ production rate in neutral current neutrino interactions on water

Abe, K., Amey, J., Andreopoulos, C., Antonova, M., Aoki, S., Ariga, A., Ashida, Y., Assylbekov, S., Autiero, D., Ban, S. …

Phys.Rev.D, 97(3) 032002-032002, Feb 3, 2018
Search for Lorentz and CPT violation using sidereal time dependence of neutrino flavor transitions over a short baseline

Abe, Ko, Amey, Josh, Andreopoulos, Costas, Antonova, Maria, Aoki, Shigeki, Ariga, Akitaka, Assylbekov, Shamil, Autiero, Dario, Ban, Sei, Barbato, Felicia C T …

Phys.Rev.D, 95(11) 111101-111101, Jun 29, 2017
Measurement of sigma(ABS) and sigma(CX) of pi(+) on carbon by the Dual Use Experiment at TRIUMF (DUET)

E. S. Pinzon Guerra, S. Bhadra, S. Berkman, C. Cao, P. de Perio, Y. Hayato, K. Ieki, M. Ikeda, Y. Kanazawa, J. Kim …

PHYSICAL REVIEW C, 95(4), Apr, 2017
First measurement of the muon neutrino charged current single pion production cross section on water with the T2K near detector

Abe, K., Constantinos Andreopoulos, Antonova, M., Aoki, S., Ariga, A., Assylbekov, S., Autiero, D., Ban, S., Barbi, M., Barker, G.J. …

Phys.Rev.D, 95(1) 012010-012010, Jan 26, 2017
Measurement of Coherent $\pi^{+}$ Production in Low Energy Neutrino-Carbon Scattering

Abe, K., Constantinos Andreopoulos, Antonova, M., Aoki, S., Ariga, A., Assylbekov, S., Autiero, D., Ban, S., Barbi, M., Barker, G.J. …

Phys.Rev.Lett., 117(19) 192501-192501, Nov 4, 2016
Solar Neutrino Measurements in Super-Kamiokande-IV

Abe, K., Haga, Y., Hayato, Y., Ikeda, M., Iyogi, K., Kameda, J., Kishimoto, Y., Marti, Ll., Miura, M., Moriyama, S. …

Phys.Rev.D, 94(5) 052010-052010, Sep 20, 2016
Search for the lepton flavour violating decay μ⁺→ e⁺γ with the full dataset of the MEG experiment: MEG Collaboration

A. M. Baldini, Y. Bao, E. Baracchini, E. Baracchini, C. Bemporad, C. Bemporad, F. Berg, F. Berg, M. Biasotti, M. Biasotti …

European Physical Journal C, 76, Aug 1, 2016
Real-Time Supernova Neutrino Burst Monitor at Super-Kamiokande

Abe, K., Haga, Y., Hayato, Y., Ikeda, M., Iyogi, K., Kameda, J., Kishimoto, Y., Miura, M., Moriyama, S., Nakahata, M. …

Astropart.Phys., 81 39-48, Aug, 2016
Measurement of double-differential muon neutrino charged-current interactions on C$_8$H$_8$ without pions in the final state using the T2K off-axis beam

Abe, Ko, Andreopoulos, Costas, Antonova, Maria, Aoki, Shigeki, Ariga, Akitaka, Assylbekov, Shamil, Autiero, Dario, Barbi, Mauricio, Barker, Gary J, Barr, Giles …

Phys.Rev.D, 93(11) 112012-112012, Jun 21, 2016
Measurement of Muon Antineutrino Oscillations with an Accelerator-Produced Off-Axis Beam

Abe, Ko, Andreopoulos, Costas, Antonova, Maria, Aoki, Shigeki, Ariga, Akitaka, Assylbekov, Shamil, Autiero, Dario, Barbi, Mauricio, Barker, Gary J, Barr, Giles …

Phys.Rev.Lett., 116(18) 181801-181801, May 5, 2016
Measurement of the muon neutrino inclusive charged-current cross section in the energy range of 1–3 GeV with the T2K INGRID detector

Abe, K., Andreopoulos, C., Antonova, M., Aoki, S., Ariga, A., Assylbekov, S., Autiero, D., Barbi, M., Barker, G.J., Barr, G. …

Phys.Rev.D, 93(7) 072002-072002, Apr 5, 2016
Muon polarization in the MEG experiment: predictions and measurements

A. M. Baldini, Y. Bao, E. Baracchini, C. Bemporad, F. Berg, M. Biasotti, G. Boca, P. W. Cattaneo, G. Cavoto, F. Cei …

EUROPEAN PHYSICAL JOURNAL C, 76(4), Apr, 2016
Measurement of the radiative decay of polarized muons in the MEG experiment

A. M. Baldini, Y. Bao, E. Baracchini, C. Bemporad, F. Berg, M. Biasotti, G. Boca, P. W. Cattaneo, G. Cavoto, F. Cei …

EUROPEAN PHYSICAL JOURNAL C, 76(3), Feb, 2016
Measurement of the ν$_μ$ charged-current quasielastic cross section on carbon with the ND280 detector at T2K

Abe, K., Adam, J., Aihara, H., Akiri, T., Andreopoulos, C., Aoki, S., Ariga, A., Assylbekov, S., Autiero, D., Barbi, M. …

Phys.Rev.D, 92(11) 112003-112003, Dec 11, 2015
Search for Nucleon and Dinucleon Decays with an Invisible Particle and a Charged Lepton in the Final State at the Super-Kamiokande Experiment

Takhistov, V., Abe, K., Haga, Y., Hayato, Y., Ikeda, M., Iyogi, K., Kameda, J., Kishimoto, Y., Miura, M., Moriyama, S. …

Phys.Rev.Lett., 115(12) 121803-121803, Sep 18, 2015
Measurement of absorption and charge exchange of pi(+) on carbon

K. Ieki, E. S. Pinzon Guerra, S. Berkman, S. Bhadra, C. Cao, P. de Perio, Y. Hayato, M. Ikeda, Y. Kanazawa, J. Kim …

PHYSICAL REVIEW C, 92(3), Sep, 2015

Books and Other Publications

高エネルギーニュース Vol. 37

家城佳, 内山雄祐 (Role: Contributor, MEG II実験 -分岐比10-14台でのμ+→e+γ崩壊探索-)

高エネルギー物理学研究者会議, Apr, 2018
Observation of ν_μ→ν_e Oscillation in the T2K Experiment

Kei Ieki

Springer Theses, 2015
高エネルギーニュース Vol. 32

家城佳, 西村康宏, Mark Hartz (Role: Contributor, T2K 実験νμ→νe振動の「発見」)

高エネルギー物理学研究者会議, Jul, 2013

Presentations

BSM search with high intensity muon beam in MEG II experiment

Kei Ieki

EPS-HEP 2019, Jul 12, 2019
Search of cLFV processes with muons and others

Kei Ieki

18th Lomonosov conference, Aug 24, 2017 Invited
MEG II liquid xenon detector with VUV-sensitive SiPM

Kei Ieki

XeSAT2017, Apr 3, 2017 Invited
Upgraded Liquid Xe Detector with SiPM

Kei Ieki

Physics of fundamental Symmetries and Interactions - PSI2016, Oct 16, 2016
Upgrade of MEG Liquid Xenon Detector with UV-Sensitive MPPCs

Kei Ieki

2015 IEEE Nuclear Science Symposium and Medical Imaging Conference, Oct 31, 2015
Upgrade of the MEG liquid xenon calorimeter with VUV-light sensitive large area SiPMs

Kei Ieki

Frontier Detectors For Frontier Physics, May 24, 2015
T2K neutrino oscillation results

Kei Ieki

Lake Louise Winter Institute 2014, Feb 16, 2014 Invited
PIAnO-Harpsichord π-N interaction measurement at TRIUMF

Kei Ieki

International Workshop on Neutrino Factories, Super Beams and Beta Beams, Jul 23, 2012 Invited
Measurement of final state interaction with pions using finely segmented scintillating fibers

Kei Ieki

The XXV International Conference on Neutrino Physics and Astorophysics, Jun 3, 2012
T2K Near Detector FGD Initial neutrino beam measurements

Kei Ieki

11th International Workshop on Next generation Nucleon Decay and Neutrino Detectors, Dec 13, 2010
T2K near detector FGD commissioning and performance

Kei Ieki

12th Vienna Conference on Instrumentation, Feb 15, 2010
T2K near detector FGD construction and DAQ test

Kei Ieki

XXIX Physics In Collision, Aug 30, 2009
MPPC for T2K Fine-Grained Detector

Kei Ieki

International Workshop on New Photon Detectors, Jun 24, 2009

Professional Memberships

The Physics Society of Japan

Research Projects

大統計パイ中間子を用いた新しい新物理探索手法の開発

科学研究費助成事業, 若手研究, 日本学術振興会, Apr, 2021 - Mar, 2023

家城佳
大強度ミューオンビームと極薄シリコン検出器を用いた新物理探索

Early-Career Scientists, Japan Society for Promotion of Science, Apr, 2018 - Mar, 2020

Kei Ieki
MEG実験によるミュー粒子稀崩壊事象の探索

海外特別研究員, 日本学術振興会, Apr, 2014 - Mar, 2016

家城佳
Ｔ２Ｋ実験における電子ニュートリノ出現モードの発見

特別研究員(DC1), 日本学術振興会, Apr, 2010 - Mar, 2013

家城佳

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