Cosmic-ray Research Division
Institute for Space–Earth Environmental Research, Nagoya University


The Cosmic-ray Research Division (also known as CR Lab) is one of the largest research group in the physics department of Nagoya University. We have 9 faculty members and a number of graduate and undergraduate students, who engage in variety of cosmic-ray experiment projects.

CR group photo
Group photo of the CR Lab members of 2021
Faculty group photo
Faculty members. From left to right, Sato, Okumura, Kazama, Itow, Tajima, Miyake, Menjo, and Matsubara (Prof. Yamaoka was absent).
  1. Faculty Staff
  2. Visitor
  3. Postdoc
  4. Doctoral Students
  5. Marsters Students
  6. Undergraduate Students
  7. Support Staff

Faculty Staff

Yoshitaka ITOW

itow@ Personal Page

Professor Yoshitaka ITOW

I am working on cutting-edge fields between particle physics and astrophysics in various research fields in cosmic ray physics. I study very high-energy interac- tions of cosmic rays with accelerators such as LHC or RHIC in LHCf/RHICf experiments. I also work on neutrino physics at Super-Kamiokande and dark matter searches in the XMASS liquid xenon experiment.

(Concurrent Post) Kobayashi–Maskawa Institute for the Origin of Particles and the Universe (KMI), Nagoya University

Hiroyasu TAJIMA

tajima@ Personal Page

Professor Hiroyasu TAJIMA

I am investigating origins, acceleration mechanisms, and propagation of cosmic rays, and search for gamma-ray signals from dark matter by development of semiconductor sensors and integrated circuits for gamma-ray instruments such as the *Fermi* satellite and Cherenkov Telescope Array and their data analysis. I am also developing microsatellites to stimulate satellite applications.

(Concurrent Post) Center for Orbital and Suborbital Observations, ISEE


ymatsu@ Personal Page

Associate Prof. Yutaka MATSUBARA

My main research interest is to observe solar neutrons on the ground to understand the acceleration mechanisms of high-energy (> 100 MeV) ions at the solar surface. In the 2013 fiscal year, we installed a new active tracking detector at the top of the Sierra Negra Mountain (4600 m above sea level) in Mexico. This is currently the most sensitive solar neutron telescope in the world.


fmiyake@ Personal Page

Associate Prof. Fusa MIYAKE

I am currently studying the variations of past cosmic ray intensities and solar activities by measuring the 14C content in tree rings and 10Be concentrations in ice cores. I am aiming to understand the occurrence features of extreme solar proton events through the investigation of 14C data over the past several tens of thousands of years. I am also interested in annual dating of ancient samples by using rapid 14C variations.

Kazutaka YAMAOKA

yamaoka@ Personal Page

Designated Assoc. Prof. Kazutaka YAMAOKA

I am aiming at unveiling relation between accretion disks and relativistic jets around a black hole and radiation mechanisms of gamma-ray bursts (GRBs) using X-ray and gamma-ray satellites. I am also recently working on solar neutron observations from space using a micro-satellite.

Belonging to the Center for Orbital and Suborbital Observations, ISEE

Akira OKUMURA Personal Page

Lecturer (Jr. Assoc. Prof.) Akira OKUMURA

I study cosmic gamma-ray radiation by the Fermi satellite and develop the Cherenkov Telescope Array (CTA), which is planned to start its full operation in 2020s. I am interested in the origin of Galactic cosmic rays and indirect dark-matter search by gamma-ray observation.

(Concurrent Post) Kobayashi–Maskawa Institute for the Origin of Particles and the Universe (KMI), Nagoya University

Hiroaki MENJO

menjo@ Personal Page

Assistant Prof. Hiroaki MENJO

For my research, I study high-energy particle interactions of cosmic rays using an accelerator. Cosmic rays interact with interstellar gas or the Earth's atmosphere and produce numerous particles. A precise understanding of cosmic-ray interactions is important to solve the mystery of the origin of cosmic rays. I am currently measuring particles produced in high-energy interactions at the world's biggest accelerator, LHC.

(Concurrent Post) Center for International Collaborative Research, ISEE


kazama@ Personal Page

Designated Assis. Prof. Shingo KAZAMA

I’m particularly interested in the nature of dark matter in our universe. Currently, I’m working on analysing the data acquired by XENON1T detector, the world’s largest dark matter detector ever built. I’m also working on R&D projects for the XENONnT experiment which will start in 2020.

Belonging to the Institute for Advanced Research (IAR) and Kobayashi–Maskawa Institute for the Origin of Particles and the Universe (KMI), Nagoya University

Kazufumi SATO

kazufumi@ Personal Page

Designated Assis. Prof. Kazufumi SATO

I study the properties of neutrinos using the Super-Kamiokande (SK) detector. I am currently working on the improvement of atmospheric neutrino flux calculation. The understanding of the production process of atmospheric neutrinos is still insufficient, and it causes large systematic errors in the physical analysis at SK. I aim for more accurate flux calculation, by taking account measurement results of accelerator experiments.


Steve Playfer

Visiting Professor Steve Playfer




JSPS Fellow Masatoshi KOBAYASHI

Doctoral Students

Grade Name Project
D3Kayo KANZAWAkanzawa@ 14C
D3Ken Ohashiohashi.ken@ LHCf

Marsters Students

Grade Name Project
M2Ryushin IDEide.ryushin@ XENON Experiment
M2Masaki USAMIusami.masaki@ Nano Satellite
M2Junya HAGAhaga.junya@ Cherenkov Telescope Array (CTA)
M2Rina HARATAharata.rina@ XENON Experiment
M2Kaori WAKAZONOwakazono.kaori@ Cherenkov Telescope Array (CTA)
M1Naoki Aoyamaaoyama.naoki@ XENON Experiment
M1Kotaro NINOMIYAninomiya.kotaro@
M1Bang Sunghyunbang.seonghyun@ Cherenkov Telescope Array (CTA)

Undergraduate Students

4 students

Support Staff

  • Administrative Staff: 2
  • Technical Staff: 3