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A commemorative photograph together with the TA staffs and students who joined the research of highest energy cosmic rays (just after closing the ICRR spring school on March 8, 2013)

Research field    Cosmic-ray Physics Experiment

Content of the research

Study of the origin of the highest energy cosmic rays

By observing the cosmic rays of about 1020eV or above, we determine the energy spectrum, arrival directions, and chemical compositions, and explore the origin of the highest energy cosmic rays and related astrophysics.

Detail of the research

The AGASA (Akeno Giant Air Shower Array) observed 11 events of extremely high energy cosmic rays of more than 1020eV beyond theoretical expectation (GZK cutoff around 6x1019eV). On the other hand, the HiRes in Utah, USA, reported the result that is consistent with the theoretical expectation. In order to solve this descrepancy decisively, we completed the ultra-high energy cosmic ray detector (Telescope Array) in March 2008, which consists of the surface detector array of an area about seven times larger than the AGASA and air fluorescence telescopes that detect air fluorescence light from air showers. The goal of TA is to measure energy spectrum, arrival directions, and chemical compositions of the heighest energy cosmic rays and explore their origin.

Some R&Ds for future projects are ongoing. In December 2012, some of ICRR TA members joined JEM-EUSO project. 

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Sagawa's schedule

===== Year 2013 =====

  • Ju.2-9: 33rd International Cosmic Ray Conference (ICRC2013) (Rio de Janeiro, Brazil)
  • In the week of Jul.17: JEM-EUSO Collaboration meeting (Tenerife, Canary Islands, Spain)
  • May 29-31: TA Collaboration meeting (Univ. of Utah, Salt Lake City, Utah, USA)
  • Apr 22-25: Calorimetry for High Energy Frontier (Paris, France)
  • Mar 26-29: Japanese Physical Society (JPS) meeting (Hiroshima Univ.)
  • Mar 14-15: TA extented analysis meeting (Tokyo Tech)
  • Mar 4-8: ICRR Spring School (ICRR)
  • Mar 4-6: 13th High Energy AstroPhysics Association in Japan (HEAPA) meeting (Kanazawa City, Ishikawa Prefecture)
  • Feb 17-21: Meetings at Univ. of Utah, Salt Lake City in Utah and Colorado School of Mines , Golden in Colorado, USA
  • Jan 27 - Feb 3: Informal meeting of JEM-EUSO calibration and TA-Auger anisotropy joint meeting (RIKEN in Wako city)
  • Jan28-30: Informal meeting of JEM-EUSO calibration (Karlsuruhe Inst. Tech. (KIT) at Karlsuruhe, Germany and APC in Univ. of Paris VII)
  • Jan 16-18: ICRR External Review Committee meeting (ICRR)

===== Year 2012 =====

      • Dec.14-16: TA collaboration meeting in Kyoto University (Kyoto, Japan)
      • Dec.3-7: JEM-EUSO Collaboration meeting (ICRR on 3th, RIKEN on other dates)

===== Past activity =====

Photo Gallery (under construction)

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