Ibaraki University's
College of Science
Department of Science (Physics Course)

Associate Professor

KATAGIRI Hideaki


Academic background

  1. The University of Tokyo Graduate School, Division of Science Doctor course 2004/03 Completed
  2. The University of Tokyo Graduate School, Division of Science Master course 2001/03 Completed
  3. The University of Tokyo Faculty of Science 1999/03 Graduated

Academic degrees

  1. M.Sc. The University of Tokyo 2001/03
  2. Ph.D. (Science) The University of Tokyo 2004/03

Research Areas

  1. Particle/Nuclear/Cosmic ray/Astro physics

Research keywords

  1. Gamma-ray astronomy, High-energy astrophysics, development of detectors, cosmic rays

Subject of research

  1. ガンマ線天文学、高エネルギー宇宙物理学 ガンマ線天文学、高エネルギー宇宙物理学

Research Projects (Competitive Research Funds)

  1. 放射能汚染地域におけるシイタケ原木林の利用再開・再生技術の開発 Others 農林水産業・食品産業科学技術研究推進事業 【実用技術開発ステージ】 (現場ニーズ対応型) 農林水産省 2016-2018
  2. 結晶シンチレータによる医療用高感度γ線コンプトンカメラの開発 Science research expense 2015/04/01-2019/03/31
  3. セシウム137からのガンマ線の到来方向が分かる安価な高感度放射線検出器の開発 Others 公益財団法人 住友財団 環境研究助成 2013/04/01-2015

Papers

  1. Research paper (scientific journal) Joint Fermi LAT Discovery of Extended Gamma-Ray Emissions in the Vicinity of the HB 3 Supernova Remnant The Astrophysical Journal 818, 114 2016 10.3847/0004-637X/818/2/114 We report the discovery of extended gamma-ray emission measured by the Large Area Telescope (LAT) onboard the Fermi Gamma-ray Space Telescope in the region of the supernova remnant (SNR) HB 3 (G132.7+1.3) and the W3 II complex adjacent to the southeast of the remnant. W3 is spatially associated with bright 12CO (J = 1-0) emission. The gamma-ray emission is spatially correlated with this gas and the SNR. We discuss the possibility that gamma rays originate in interactions between particles accelerated in the SNR and interstellar gas or radiation fields. The decay of neutral pions produced in nucleon-nucleon interactions between accelerated hadrons and interstellar gas provides a reasonable explanation for the gamma-ray emission. The emission from W3 is consistent with irradiation of the CO clouds by the cosmic rays accelerated in HB 3.
  2. Research paper (scientific journal) Joint Optical Spectroscopic Observations of Gamma-Ray Blazar Candidates. VI. Further Observations from TNG, WHT, OAN, SOAR, and Magellan Telescopes The Astronomical Journal 151, 10 2016 Blazars, one of the most extreme classes of active galaxies, constitute so far the largest known population of γ-ray sources, and their number is continuously growing in the Fermi catalogs. However, in the latest release of the Fermi catalog there is still a large fraction of sources that are classified as blazar candidates of uncertain type (BCUs) for which optical spectroscopic observations are necessary to confirm their nature and their associations. In addition
  3. Research paper (scientific journal) Joint Fermi LAT Study of Gamma-Ray Emission in the Direction of the Monoceros Loop Supernova Remnant The Astrophysical Journal 831, 106 2016 10.3847/0004-637X/831/1/106 We present an analysis of the gamma-ray measurements by the Large Area Telescope on board the Fermi Gamma-ray Space Telescope in the region of the supernova remnant (SNR) Monoceros Loop (G205.5+0.5). The brightest gamma-ray peak is spatially correlated with the Rosette Nebula, which is a molecular cloud complex adjacent to the southeast edge of the SNR. After subtraction of this emission by spatial modeling, the gamma-ray emission from the SNR emerges, which is extended and fit by a Gaussian spatial template. The gamma-ray spectra are significantly better reproduced by a curved shape than a simple power law. The luminosities between 0.2 and 300 GeV are ˜ 4× {10}34 erg s-1 for the SNR and ˜ 3× {10}34 erg s-1 for the Rosette Nebula, respectively. We argue that the gamma-rays likely originate from the interactions of particles accelerated in the SNR. The decay of neutral pions produced in nucleon-nucleon interactions of accelerated hadrons with interstellar gas provides a reasonable explanation for the gamma-ray emission of both the Rosette Nebula and the Monoceros SNR.
  4. Joint 22pAM-2 次世代ガンマ線望遠鏡CTAで用いる波形記録回路TARGETの時間応答特性の評価 重中 茜, 片桐 秀明, 田島 宏康, 奥村 曉, the CTA Consortium 日本物理学会講演概要集 一般社団法人日本物理学会 71/ 1 2016/03/19 2189079X URL
  5. Research paper (scientific journal) Joint Development of a Low-Cost-High-Sensitivity Compton Camera using CsI (Tl) Scintillators (γI) Nuclear Inst. and Methods in Physics Research A 804, 25-32 2015 10.1016/j.nima.2015.09.014 We have developed a novel low-cost gamma-ray imaging Compton camera γI that has a high detection efficiency. Our motivation for the development of this detector was to measure the arrival directions of gamma rays produced by radioactive nuclides that were released by the Fukushima Daiichi nuclear power plant accident in 2011. The detector comprises two arrays of inorganic scintillation detectors, which act as a scatterer and an absorber. Each array has eight scintillation detectors, each comprising a large CsI (Tl) scintillator cube of side 3.5 cm, which is inexpensive and has a good energy resolution. Energies deposited by the Compton scattered electrons and subsequent photoelectric absorption, measured by each scintillation counter, are used for image reconstruction. The angular resolution was found to be 3.5° after using an image-sharpening technique. With this angular resolution, we can resolve a 1 m2 radiation hot spot that is located at a distance of 10 m from the detector with a wide field of view of 1 sr. Moreover, the detection

Research presentations

  1. Oral presentation(general) Development of an all-sky RI imaging monitor capable of measuring high-dose-rate gamma-ray sources 日本医学物理学会 2016/04
  2. Oral presentation(general) CsI(Tl)シンチレータによるオールスカイガンマ線コンプトンカメラの開発 日本物理学会 2016/03
  3. Oral presentation(general) シンチレータを用いた高線量場測定用コンプトンカメラの開発 日本物理学会 2016/03
  4. Oral presentation(general) ガンマ線の到来方向が判断できる4チャンネル型高感度サーベイメータの開発 日本物理学会 2016/03
  5. Oral presentation(general) 次世代ガンマ線望遠鏡CTAで用いる波形記録回路TARGETの時間応答特性の評価 日本物理学会 2016/03

Prizes

  1. 第111回日本医学物理学会学術大会 大会長賞 Development of an all-sky RI imaging monitor capable of measuring high-dose-rate gamma-ray sources 2016/04
  2. 第110 回日本医学物理学会学術大会 優秀研究賞 2015/09
  3. 第107回日本医学物理学会学術大会大会長賞 Development of a novel γ-ray imaging system (γI:gamma-eye) using Compton camera technique 2014
  4. 第106 回日本医学物理学会学術大会優秀研究賞 Application of a filtered back projection algorithm to Compton camera technique 2013

Alloted class

  1. Introductory physics I
  2. Experiments in General Physics
  3. Astrophysics II
  4. Scientific English Reading I
  5. Scientific English Reading II

Memberships of academic societies

  1. The Astronomical Society of Japan
  2. The Physical Society of Japan