1. Home
  2. Research
  3. Centers & Labs
  4. RIKEN Nishina Center for Accelerator-Based Science

RIKEN Nishina Center for Accelerator-Based Science Cosmic Radiation Laboratory

Director: Toru Tamagawa (D.Sc.)

Research Summary

Toru  Tamagawa(D.Sc.)

Immediately after the Big Bang, the beginning of our universe, only hydrogen and helium existed. However, nuclear fusion in the interior of stars and the explosion of supernovae in the universe over the course of 13.8 billion years led to the evolution of a world brimming with the many different elements we have today. By using man-made satellites to observe X-rays and gamma-rays emitted from celestial objects, we are observing the synthesis of the elements at their actual source. Our goal is to comprehensively elucidate the scenarios for the formation of the elements in the universe, together with our research on sub-atomic physics through the use of an accelerator.

Main Research Fields

  • Mathematical & Physical Sciences

Related Research Fields

  • Engineering


  • Nucleosynthesis in our universe
  • Development of innovative X-ray detectors
  • Particle acceleration mechanism
  • Physics in extremely strong magnetic and gravitational field

Selected Publications

  • 1.The Hitomi collaboration:
    "The quiescent intracluster medium in the core of the Perseus cluster"
    Nature, 535, 117-121 (2016).
  • 2.Iwakiri, W. B., Black, J. K., Cole, R., Enoto, T., Hayato, A., Hill, J. E., Jahoda, K., Kaaret, P., Kitaguchi, T., Kubota, M., Marlowe, H., McCurdy, R., Takeuchi, Y., Tamagawa, T.:
    "Performance of the PRAXyS X-ray polarimeter",
    Nuclear Inst. and Methods in Physics Research, A, 838, 89 (2016).
  • 3.Serino, M., Iwakiri, W., Tamagawa, T., Sakamoto, T., Nakahira, S., Matsuoka, M., Yamaoka, K., Negoro, H.
    "MAXI observations of long X-ray bursts"
    Publications of the Astronomical Society of Japan, 68, 95 (2016).
  • 4.Kita, H., Kimura, T., Tao, C., Tsuchiya, F., Misawa, H., Sakanoi, T., Kasaba, Y., Murakami, G., Yoshioka, K., Yamazaki, A.:
    "Characteristics of solar wind control on Jovian UV auroral activity deciphered by long-term Hisaki EXCEED observations: Evidence of preconditioning of the magnetosphere?"
    Geophysical Research Letters, 43, 6790-6798, (2016).
  • 5.Takeuchi, Y., Yamaguchi, H., Tamagawa, T.:
    "A systematic study of evolved supernova remnants in the large and small Magellanic Clouds with Suzaku"
    Publications of the Astronomical Society of Japan, 68, S9 (2016).
  • 6.Okura, Y., Petri, A., May, M., Plazas, A. A., Tamagawa, T.:
    "Consequences of CCD Imperfections for Cosmology Determined by Weak Lensing Surveys: From Laboratory Measurements to Cosmological Parameter Bias"
    The Astrophysical Journal, 825, 61 (2016).
  • 7.Nakano, T., Murakami, H., Furuta, Y., Enoto, T., Masuyama, M., Shigeyama, T., Makishima, K.:
    "Study of the progenitor of the magnetar 1E 2259+586 through Suzaku observations of the associated supernova remnant CTB 109"
    Publications of the Astronomical Society of Japan, 69, 40 (2017).
  • 8.Terada, Y., Maeda, K., Fukazawa, Y., Bamba, A., Ueda, Y., Katsuda, S., Enoto, T., Takahashi, T., Tamagawa, T., Röpke, F. K., Summa, A., Diehl, R.:
    "Measurements of the Soft Gamma-Ray Emission from SN2014J with Suzaku"
    The Astrophysical Journal, 823, 43, (2016).
  • 9.Jahoda, K., Kallman, T., Kouveliotou, C., Lorella, A., Black, J. K., Hill, J. E., Jaeger, T., Kaaret, P., Markwardt, C. B., Okajima, T., Petre, R., Schnittman, J., Soong, Y., Strohmayer, T. E., Tamagawa, T., Tawara, Y.
    "The Polarimeter for Relativistic Astrophysical X-ray Sources"
    Proceedings of the SPIE, 9905, 990516 (2016).

Recent Research Results

Related Links

Lab Members

Principal investigator

Toru Tamagawa

Core members

Tatehiro Mihara
Senior Research Scientist
Takao Kitaguchi
Contract Researcher
Asami Hayato
Visiting Researcher
Yuanhui Zhou
Junior Research Associate
Hirokazu Odaka
Visiting Scientist
Toshio Nakano
Visiting Scientist
Yoko Takeuchi
Visiting Scientist
Satoru Katsuda
Visiting Scientist
Shinya Yamada
Visiting Scientist
Teruaki Enoto
Visiting Scientist
Yuki Okura
Visiting Scientist
Tomoki Kimura
Visiting Scientist
Ikuyuki Mitsuishi
Visiting Scientist
Yuuki Wada
Student Trainee
Miho Okubo
Student Trainee
Marina Tsutsumi
Student Trainee
Keisuke Uchiyama
Student Trainee

Contact Information

Nishina RIBF Bldg.,
2-1 Hirosawa,
Wako, Saitama
351-0198, Japan
Email: tamagawa [at] riken.jp