Centers & Labs

RIKEN Nishina Center for Accelerator-Based Science

High Energy Astrophysics Laboratory

Group Director: Toru Tamagawa (D.Sci.)
Toru  Tamagawa(D.Sci.)

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 Field

Mathematical and physical sciences

Related Research Fields



  • 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).

Lab Members

Principal Investigator

Toru Tamagawa
Group Director

Core Members

Hirokazu Odaka
Special Postdoctoral Researcher
Toshio Nakano
Special Postdoctoral Researcher
Tomoki Kimura
Special Postdoctoral Researcher
Liyi Gu
Special Postdoctoral Researcher
Takao Kitaguchi
Contract Researcher
Asami Hayato
Visiting Researcher
Yuuki Wada
Junior Research Associate

Contact information

Nishina RIBF Bldg.,
2-1 Hirosawa,
Wako, Saitama
351-0198, Japan

Email: tamagawa [at]

Related links

Recent research results