The paper titled “Search for Extremely-High-Energy Neutrinos and First Constraints on the Ultrahigh-Energy Cosmic-Ray Proton Fraction with IceCube,” published last July by Dr. Maximilian Meier, has been selected for the Physical Review Letters (PRL) “PRL Collection of the Year 2025.”

For further details, please visit the PRL special collection page.

The IceCube upgrade construction at the South Pole has been completed. The optical detector “D-Egg,” developed by the IceCube Chiba group, has been installed as a key component, marking a new phase in neutrino observation.

For further details, please see the press release by the IceCube collaboration.

A paper by Assistant Professor Nobuhiro Shimizu and his colleagues,"The First Search for Astronomical Transient as a Counterpart of a Month-timescale IceCube Neutrino Multiplet Event" has been published on October 23, 2025 in The Astrophysical Journal.
For further details, please see Press Release issued from Tohoku University

(Image credit: Zwicky Transient Facility)

A paper by Associate Professor Yosuke Matsumoto and his colleagues,"Linearly Polarized Coherent Emission from Relativistic Magnetized Ion-Electron Shocks" has been published on January 16, 2024, in the Amarican science journal, Physical Review Letters.

Press Release

Associate Professor Hotta received the ASJ Young Astronomer Award, which is given annually to at most three young researchers, under 35 years of age, who have made significant accomplishments in astronomy.

Associate Professor Hotta received the 2021 Chiba University Advanced Science Award, which is given to young researchers who have demonstrated high research ability, such as budding research or research with an original perspective, in order to contribute to the dissemination of highly original science and technology.

A paper by Associate Professor Hideyuki Hotta and his colleagues,"Solar differential rotation reproduced with high-resolution simulation," has been published in the British science journal, Nature Astronomy.
News Release
Press Release

A paper by Associate Professor Ishiyama and his colleagues, "The Uchuu simulations: Data Release 1 and dark matter halo concentrations" has been published in the world's leading primary research journal Monthly Notices of the Royal Astronomical Society.
News Release (CfCA Project, NAOJ)

English version of ICEHAP's website has been relaunched.

A new IceCube research paper, "Detection of a particle shower at the Glashow resonance with IceCube," has been published in Nature.
Press Release from IceCube Collaboration

A paper by Associate Professor Hotta and his colleagues,"Gradual onset of the Maunder Minimum revealed by high-precision carbon-14 analyses" has been published in the British scientific journal Scientific Reports.
News Release

Project Associate Professor Matsumoto received the 2020 Chiba University Advanced Science Award, which is given to young researchers who have demonstrated high research ability, such as budding research or research with an original perspective, in order to contribute to the dissemination of highly original science and technology.

Associate Professor Hotta received the Outstanding Achievement Award for HPCI Research Proposals in the category of Physics, Particle Science, and Astronomy for the proposal "Exploration of thermal convection and magnetic field activity in low-mass stars (proposal number: hp190070)" at the 7th HPCI Research Announcement Meeting.

An article, "Prospects of Neutrino Astronomy with IceCube", contributed by Prof. Shigeru Yoshida and Prof. Aya Ishihara, is published in the November issue of "Tenmonogeppo".

ICEHAP's website has been relaunched.

From October 2020, the Center will be reorganized as an independent, university-wide center from the Institute of Science. It will promote research and education activities as Chiba University's flagship research center, and operate as a research organization open to the global research community.

A new book by Prof. Shigeru Yoshida, Director of ICEHAP Center, "Shin Uchu Neutriono no Hakken (Discovery of Deep Space Neutrinos)" has been released from Kobunsha Shinsho. The motivation for writing this book and some interesting episodes are posted on the Kobunsha Shinsho website.

A research group led by Yosuke Matsumoto, project associate professor at our center, and Takanobu Amano, associate professor at the Graduate School of the University of Tokyo, has clarified the mechanism of the production of "seed" particles (the "first step"), which has been the greatest challenge in the acceleration of high-energy cosmic-ray electrons, and published their results in Physical Review Letters.