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国分 紀秀

コクブン モトヒデ  (Motohide Kokubun)

基本情報

所属
国立研究開発法人宇宙航空研究開発機構 宇宙科学研究所 宇宙物理学研究系 准教授
総合研究大学院大学 物理科学研究科 宇宙科学専攻 准教授
特定国立研究開発法人理化学研究所 光量子工学研究センター 時空間エンジニアリング研究チーム 客員研究員
学位
博士(理学)(2001年3月 東京大学)
研究者番号
50334248
ORCID ID
 https://orcid.org/0000-0003-3529-3029
J-GLOBAL ID
200901059420620376
researchmap会員ID
1000367787
外部リンク

研究キーワード

 4

研究分野

 2

委員歴

 1

主要な論文

 248
  • Motohide Kokubun, Kazuo Makishima, Tadayuki Takahashi, Toshio Murakami, Makoto Tashiro, Yasushi Fukazawa, Tuneyoshi Kamae, Greg M. Madejski, Kazuhiro Nakazawa, Kazutaka Yamaoka, Yukikatsu Terada, Daisuke Yonetoku, Shin Watanabe, Toru Tamagawa, Tsunefumi Mizuno, Aya Kubota, Naoki Isobe, Isao Takahashi, Goro Sato, Hiromitsu Takahashi, Soojing Hong, Madoka Kawaharada, Naomi Kawano, Takefumi Mitani, Mio Murashima, Masaya Suzuki, Keiichi Abe, Ryouhei Miyawaki, Masanori Ohno, Takaaki Tanaka, Takayuki Yanagida, Takeshi Itoh, Kousuke Ohnuki, Ken-ichi Tamura, Yasuhiko Endo, Shinya Hirakuri, Tatsuro Hiruta, Takao Kitaguchi, Tetsuichi Kishishita, Satoshi Sugita, Takuya Takahashi, Shin'ichiro Takeda, Teruaki Enoto, Ayumi Hirasawa, Jun'ichiro Katsuta, Satoshi Matsumura, Kaori Onda, Mitsuhiro Sato, Masayoshi Ushio, Shin-nosuke Ishikawa, Koichi Murase, Hirokazu Odaka, Masanobu Suzuki, Yuichi Yaji, Shinya Yamada, Tomonori Yamasaki, Takayuki Yuasa
    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 59(1 SPEC. ISS.) S53-S76 2007年1月  査読有り
    The in-orbit performance and calibration of the Hard X-ray Detector (HXD) on board the X-ray astronomy satellite Suzaku are described. Its basic performances, including a wide energy bandpass of 10-600keV, energy resolutions of similar to 4 keV (FWHM) at 40 keV and similar to 11% at 511 keV, and a high background rejection efficiency, have been confirmed by extensive in-orbit calibrations. The long-term gains of PIN-Si diodes have been stable within 1% for half a year, and those of scintillators have decreased by 5-20%. The residual non-X-ray background of the HXD is the lowest among past non-imaging hard X-ray instruments in energy ranges of 15-70 and 150-500 keV. We provide accurate calibrations of energy responses, angular responses, timing accuracy of the HXD, and relative normalizations to the X-ray CCD cameras using multiple observations of the Crab Nebula.
もっとみる

MISC

 303
  • 滝沢 京子, 出澤 恵理子, 片岡 淳, 釜江 常好, 国分 紀秀, 齋藤 芳隆, 高橋 忠幸, 田代 信, 深沢 泰司, 牧島 一夫, 松崎 恵一, 水野 恒史, 吉田 篤正, HXDチーム
    日本物理学会講演概要集 52(1) 74-74 1997年3月17日  
  • N Tsuchida, M Ikeda, T Kamae, M Kokubun
    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 385(2) 290-298 1997年1月  
    We have measured the temperature dependence of the gamma-ray excited scintillation decay time profile and light yield of four inorganic scintillators GSO (Gd-2(SiO4)O; Ce), YSO (Y-2(SiO4)O; Ce), YAP(YAlO3; Ce) and BGO(Bi4Ge3O12) by the delayed coincidence method between -20 and +20 degrees C. Two to three decay components are found in all crystals, and their light yields and decay time constants are highly dependent on temperature. The total light yield (t = 0 - infinity) and the effective decay time constant are found to increase with decrease in the temperature for all four crystals, When integrated with 500 ns time constant, the light yield increases significantly for EGO and GSO but decreases appreciably for YSO and YAP, as the temperature drops below -10 degrees C. The rising part of the scintillation pulse shows the prompt build-up for GSO in all temperatures measured and for YSO above 10 degrees C, suggesting the energy transfer mechanism from gamma-ray excited Gd3+/Y3+ sites to the Ce3+ luminescent centers noted by Suzuki et al.
  • 大曽根 聡子, 片岡 淳, 山岡 和貴, 高橋 忠幸, HXDチーム, 久保田 あや, 松崎 恵一, 釜江 常好, 深沢 泰司, 齋藤 芳隆, 江沢 元, 国分 紀秀, 水野 恒史
    日本物理学会講演概要集 52 75-75 1997年  

担当経験のある科目(授業)

 2

所属学協会

 3

共同研究・競争的資金等の研究課題

 10
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産業財産権

 3
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