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

Members

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 2025
Faculty group photo
Faculty members and Postdocs. From left to right, Kazama, Miyake, Tajima, Okumura, Matsubara, Kobayashi, Takahashi, Itow, Ohashi, and Menjo (Prof. Yamaoka was absent).
  1. Faculty Staff
  2. Postdoc
  3. Visitor
  4. Doctoral Students
  5. Marsters Students
  6. Undergraduate Students
  7. Support Staff

Faculty Staff

Hiroyasu TAJIMA

tajima@ISEE 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

Masaki YAMASHITA

masaki.yamashita@NAGOYA Personal Page

Professor Masaki YAMASHITA

My main research interest is in particle physics and astrophysics, in the particular domain of dark matter and neutrino. I look for dark matter particles by detecting directly via elastic scattering of target nuclei in the terrestrial detector located in the deep underground laboratories. I am currently working on the XENONnT and XLZD experiment, which uses liquid xenon technology in the undergournd laboratory.

Fusa MIYAKE

fmiyake@ISEE 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.

(Concurrent Post) Office for the Promotion of Transdisciplinary Network, ISEE

Shingo KAZAMA

kazama@ISEE Personal Page

Associate 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 XENONnT detector, the world’s largest dark matter detector ever built. I’m also working on R&D projects for the future DARWIN experiment.

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

Kazutaka YAMAOKA

yamaoka@ISEE Personal Page

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.

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

Akira OKUMURA

oxon@mac.com 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@ISEE 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 Posts) Center for International Collaborative Research, ISEE, and Kobayashi–Maskawa Institute for the Origin of Particles and the Universe (KMI), Nagoya University

Mitsunari TAKAHASHI

takahashi.mitsunari@ISEE Personal Page

Designated Assistant Prof. Mitsunari TAKAHASHI

I am working on the development and calibration of the Cherenkov Telescope Array, the development of novel data classes of *Fermi* Gamma-ray Space Telescope, and data analysis of active galactic nuclei and gamma-ray bursts.

Masatoshi KOBAYASHI

kobayashi.masatoshi@ISEE Personal Page

Designated Assistant Prof. Masatoshi KOBAYASHI

I have been working on the direct search of dark matter, using liquid xenon detectors. Currently, the main research topic is the data analysis and hardware development for XENONnT experiment in LNGS, Italy. I am also working on the R&D project for future large scale dark matter search, DARWIN experiment.

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

Postdoc

HUANG Junying

huang.junying@NAGOYA

Project Postdoc Researcher HUANG Junying

I am working on the XENONnT experiment in Italy, a dark matter detector using a liquid xenon time projection chamber. My research focuses on XENONnT data analysis and detector R&D projects.

Visitor

Steve Playfer

Visiting Professor Steve Playfer

Doctoral Students

Grade Name Project
D3BANG Sunghyunbang.seonghyun@ISEE Cherenkov Telescope Array (CTA)
D2Yushi YOSHIOKAyoshioka.yushi@ISEE Super-Kamiokande/Hyper-Kamiokande
D1Ryu KAWARASAKIkawarasaki.ryu@ISEE Cherenkov Telescope Array (CTA)
D1Shin KUSHIMAkushima.shin@ISEE AMEGO-X Satellite
D1Haruka KOBAYASHIkobayashi.haruka@ISEE LHCf Experiment
D1Ryuta MIYATAmiyata.ryuta@ISEE XENON Experiment

Marsters Students

Grade Name Project
M2Yuto OMOTANIomotani.yuto@ISEE Fermi/LAT
M2Daichi ANDOdaichi.ando@NAGOYA Cherenkov Telescope Array (CTA)
M2Mitsuki UTOYAMAutoyama.mitsuki.h6@S XENON Experiment
M2Mikito SAKUMAsakuma.mikito.m2@S LHCf Experiment
M2Taiki SHIMADAshimada.taiki@NAGOYA XENON Experiment
M2Koki FUJIKAWAfujikawa.koki@NAGOYA XENON Experiment
M1Ayumu ISHIMARUishimaru.ayumu.f8@S XENON Experiment
M1Sogo ITOsito@NAGOYA Cherenkov Telescope Array (CTA)
M1Yoshitomo KINOSHITAkinoshita.yoshitomo.z8@S Fermi/LAT
M1Ayuki TAKESHITAtakeshita.ayuki.v8@S XENON Experiment
M1Lisa ZISLINzislin.lisa.t7@S
M1Asaf AYALONayalon.asaf.c0@S
M1

Undergraduate Students

2 students

Support Staff

  • Administrative Staff: 2
  • Technical Staff: 3