Study at TCU


Name KADOTA Kenichi
Official Title Lecturer
Affiliation Department of Natural Sciences, Faculty of Science and Engineering
Profile My specialty is observational research on cosmic rays. In particular, I am studying ultra-high energy cosmic rays by observing the air shower phenomenon that occurs when cosmic rays enter the Earth's atmosphere. More than 100 years have passed since the discovery of cosmic rays, but their origins are not yet understood. In order to understand the origin of cosmic rays, it is one of the important clues to accurately observe the energy spectrum, the chemical composition and the anisotropy of arrival direction of ultra-high energy cosmic rays. In order to observe ultra-high energy cosmic rays with high accuracy on earth, we have developed a detector that requires a large detection area, and continuously store and analyze observation data of ultra-high energy cosmic rays. By doing so, we hope to approach the mystery of the origin of cosmic rays as a step. Later, I aim for the path of astronomy using cosmic rays.
Research Field(Keyword & Summary)
  1. Origin of ultra-high energy cosmic rays

    Using an ultra-high energy cosmic ray observation device built in Utah, USA, called Telescope Array (consisting of surface detectors that measure air shower particles and reflector telescopes that measure atmospheric fluorescence), I analyze the energy spectrum, the chemical composition, and the anisotropy of arrival direction of ultra-high energy cosmic rays.

Representative Papers
  1. (1) The Cosmic-Ray Composition between 2 PeV and 2 EeV Observed with the TALE Detector in Monocular Mode, Astrophysical Journal, Vol.909, No.2, March 2021.
  2. (2) Observations of the Origin of Downward Terrestrial Gamma-Ray Flashes, Journal of Geophysical Research: Atmospheres, Vol.125, No.23, October 2020.
  3. (3) Measurement of the proton-air cross section with Telescope Array’s Black Rock Mesa and Long Ridge fluorescence detectors, and surface array in hybrid mode, Physical Review D, Vol.102, No.6, September 2020.
  4. (4) Search for Ultra-High-Energy Neutrinos with the Telescope Array Surface Detector, Journal of Experimental and Theoretical Physics, Vol.131, No.2, September 2020.
  5. (5) Evidence for a Supergalactic Structure of Magnetic Deflection Multiplets of Ultra-high-energy Cosmic Rays, Astrophysical Journal, Vol.899, No.1, August 2020.
  6. (6) Search for Large-scale Anisotropy on Arrival Directions of Ultra-high-energy Cosmic Rays Observed with the Telescope Array Experiment, Astrophysical Journal Letters, Vol.898, No.2, July 2020.
  7. (7) Search for point sources of ultra-high-energy photons with the Telescope Array surface detector, Monthly Notices of the Royal Astronomical Society, Vol.492, No.3, March 2020.
  8. (8) Constraints on the diffuse photon flux with energies above 1018 eV using the surface detector of the Telescope Array experiment, Astroparticle Physics, Vol.110, July 2019.
  9. (9) Mass composition of ultrahigh-energy cosmic rays with the Telescope Array Surface Detector data, Physical Review D, Vol.99, No.2, January 2019.
  10. (10) Testing a Reported Correlation between Arrival Directions of Ultra-high-energy Cosmic Rays and a Flux Pattern from nearby Starburst Galaxies using Telescope Array Data, Astrophysical Journal, Vol.867, No.2, November 2018.
Grant-in-Aid for Scientific Research Support: Japan Society for Promotion of Science (JSPS)
Recruitment of research assistant(s) No
Education Field (Undergraduate level) Physics, Astronomy
Education Field (Graduate level) Advanced Astronomy