MORI Koji

写真a

Affiliation

Engineering educational research section Applied Physics and Engineering Program

Title

Professor

External Link

Degree 【 display / non-display

  • Doctor (Science) ( 2002.6   Osaka University )

Research Areas 【 display / non-display

  • Natural Science / Astronomy  / X-ray and Gamma-ray astrophysics

 

Papers 【 display / non-display

  • Long‐Term Density Trend in the Mesosphere and Lower Thermosphere From Occultations of the Crab Nebula With X‐Ray Astronomy Satellites Reviewed International coauthorship

    勝田 哲, 榎戸 輝揚, 森 浩二, 望月 優子, 中島 基樹, 佐藤 浩介, 田代 信, 寺田 幸功

    Journal of Geophysical Research: Space Physics   128 ( 2 )   2023.2

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Geophysical Union (AGU)  

    We present long-term density trends of the Earth's upper atmosphere at altitudes between 71 and 116 km, based on atmospheric occultations of the Crab Nebula observed with X-ray astronomy satellites, ASCA, RXTE, Suzaku, NuSTAR, and Hitomi. The combination of the five satellites provides a time period of 28 years from 1994 to 2022. To suppress seasonal and latitudinal variations, we concentrate on the data taken in autumn (49 < doy < 111) and spring (235 < doy < 297) in the northern hemisphere with latitudes of 0°–40°. With this constraint, local times are automatically limited either around noon or midnight. We obtain four sets (two seasons × two local times) of density trends at each altitude layer. We take into account variations due to a linear trend and the 11-year solar cycle using linear regression techniques. Because we do not see significant differences among the four trends, we combine them to provide a single vertical profile of trend slopes. We find a negative density trend of roughly −5%/decade at every altitude. This is in reasonable agreement with inferences from settling rate of the upper atmosphere. In the 100–110-km altitude, we found an exceptionally high density decline of about −12%/decade. This peak may be the first observational evidence for strong cooling due to water vapor and ozone near 110 km, which was first identified in a numerical simulation by Akmaev et al. (2006, https://doi.org/10.1016/j.jastp.2006.03.008). Further observations and numerical simulations with suitable input parameters are needed to establish this feature.

    CiNii Research

  • Spectral break of energetic pulsar wind nebulae detected with wideband X-ray observations Reviewed

    Bamba A., Shibata S., Tanaka S.J., Mori K., Uchida H., Terada Y., Ishizaki W.

    Publications of the Astronomical Society of Japan   74 ( 5 )   1186 - 1197   2022.10

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Publications of the Astronomical Society of Japan  

    Pulsar wind nebulae (PWNe) are one of the most energetic galactic sources with bright emissions from radio waves to very high-energy gamma-rays. We perform wideband X-ray spectroscopy of four energetic PWNe, N 157 B, PSR J1813−1749, PSR J1400−6325, and G21.5−0.9, with the Suzaku, Chandra, NuSTAR, and Hitomi observatories. A significant spectral break or cut-off feature is found in the hard X-ray band for all the samples, except for N 157 B. The break energies in the broken power-law fitting are in the range of 4–14 keV, whereas the cut-off energies in the cut-off power-law fitting are at 22 keV or higher. The break or cut-off energy does not show a significant correlation with either the spin-down energy or characteristic age of the hosting pulsars. A possible correlation is found between the photon index change in the broken power-law fitting and the X-ray emitting efficiency of the pulsars, although its significance is not high enough to be conclusive. We discuss what determines the break parameters based on simple models.

    DOI: 10.1093/pasj/psac062

    Scopus

  • Single event tolerance of x-ray silicon-on-insulator pixel sensors Reviewed

    Hagino K., Hayashida M., Kohmura T., Doi T., Tsunomachi S., Kitajima M., Tsuru T.G., Uchida H., Kayama K., Mori K., Takeda A., Nishioka Y., Yukumoto M., Mieda K., Yonemura S., Ishida T., Tanaka T., Arai Y., Kurachi I., Kitamura H., Kawahito S., Yasutomi K.

    Journal of Astronomical Telescopes, Instruments, and Systems   8 ( 4 )   2022.10

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Astronomical Telescopes, Instruments, and Systems  

    We evaluate the single event tolerance of the x-ray silicon-on-insulator (SOI) pixel sensor named XRPIX, developed for the future x-ray astronomical satellite FORCE. In this work, we measure the cross-section of single event upset (SEU) of the shift register on XRPIX by irradiating heavy ion beams with linear energy transfer (LET) ranging from 0.022 to 68 MeV / (mg/cm2). From the SEU cross-section curve, the saturation cross-section and threshold LET are successfully obtained to be 3.4-0.9+2.9×10-10 cm2/bit and 7.3-3.5+1.9 MeV/(mg/cm2), respectively. Using these values, the SEU rate in orbit is estimated to be â‰2 0.1 event / year primarily due to the secondary particles induced by cosmic-ray protons. This SEU rate of the shift register on XRPIX is negligible in the FORCE orbit.

    DOI: 10.1117/1.JATIS.8.4.046001

    Scopus

  • Xtend, the soft x-ray imaging telescope for the X-Ray Imaging and Spectroscopy Mission (XRISM)

    Mori K., Tomida H., Nakajima H., Okajima T., Noda H., Tanaka T., Uchida H., Hagino K., Kobayashi S.B., Suzuki H., Yoshida T., Murakami H., Uchiyama H., Nobukawa M., Nobukawa K., Yoneyama T., Matsumoto H., Tsuru T., Yamauchi M., Hatsukade I., Ishida M., Maeda Y., Hayashi T., Tamura K., Boissay-Malaquin R., Sato T., Hiraga J., Kohmura T., Yamaoka K., Dotani T., Ozaki M., Tsunemi H., Kanemaru Y., Sato J., Takaki T., Terada Y., Miyazaki K., Kusunoki K., Otsuka Y., Yokosu H., Yonemaru W., Asahina Y., Asakura K., Yoshimoto M., Ode Y., Sato J., Hakamata T., Aoyagi M., Aoki Y., Tsunomachi S., Doi T., Aoki D., Fujisawa K., Kitajima M., Hayashida K.

    Proceedings of SPIE - The International Society for Optical Engineering   12181   2022.8

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Proceedings of SPIE - The International Society for Optical Engineering  

    Xtend is a soft x-ray imaging telescope developed for the x-ray imaging and spectroscopy mission (XRISM). XRISM is scheduled to be launched in the Japanese fiscal year 2022. Xtend consists of the soft x-ray imager (SXI), an x-ray CCD camera, and the x-ray mirror assembly (XMA), a thin-foil-nested conically approximated Wolter-I optics. The SXI uses the P-channel, back-illuminated type CCD with an imaging area size of 31mm on a side. The four CCD chips are arranged in a 2×2 grid and can be cooled down to -120 °C with a single-stage Stirling cooler. The XMA nests thin aluminum foils coated with gold in a confocal way with an outer diameter of 45 cm. A pre-collimator is installed in front of the x-ray mirror for the reduction of the stray light. Combining the SXI and XMA with a focal length of 5.6m, a field of view of 38′ × 38′ over the energy range from 0.4 to 13 keV is realized. We have completed the fabrication of the flight model of both SXI and XMA. The performance verification has been successfully conducted in a series of sub-system level tests. We also carried out on-ground calibration measurements and the data analysis is ongoing.

    DOI: 10.1117/12.2626894

    Scopus

  • A broadband X-ray imaging spectroscopy in the 2030s: the FORCE mission International coauthorship

    Mori K., Tsuru T.G., Nakazawa K., Ueda Y., Watanabe S., Tanaka T., Ishida M., Matsumoto H., Awaki H., Murakami H., Nobukawa M., Takeda A., Fukazawa Y., Tsunemi H., Takahashi T., Hornschemeier A., Okajima T., Zhang W.W., Williams B.J., Venters T., Madsen K., Yukita M., Akamatsu H., Bamba A., Enoto T., Fujita Y., Furuzawa A., Hagino K., Ishimura K., Itoh M., Kitayama T., Kobayashi S., Kohmura T., Kubota A., Mizumoto M., Mizuno T., Nakajima H., Nobukawa K.K., Noda H., Odaka H., Ota N., Sato T., Shidatsu M., Suzuki H., Takahashi H., Tanimoto A., Terada Y., Terashima Y., Uchida H., Uchiyama Y., Yamaguchi H., Yatsu Y.

    Proceedings of SPIE - The International Society for Optical Engineering   12181   2022.8

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Proceedings of SPIE - The International Society for Optical Engineering  

    In this multi-messenger astronomy era, all the observational probes are improving their sensitivities and overall performance. The Focusing on Relativistic universe and Cosmic Evolution (FORCE) mission, the product of a JAXA/NASA collaboration, will reach a 10 times higher sensitivity in the hard X-ray band (E > 10 keV) in comparison with any previous hard X-ray missions, and provide simultaneous soft X-ray coverage. FORCE aims to be launched in the early 2030s, providing a perfect hard X-ray complement to the ESA flagship mission Athena. FORCE will be the most powerful X-ray probe for discovering obscured/hidden black holes and studying high energy particle acceleration in our Universe and will address how relativistic processes in the universe are realized and how these affect cosmic evolution. FORCE, which will operate over 1–79 keV, is equipped with two identical pairs of supermirrors and wideband X-ray imagers. The mirror and imager are connected by a high mechanical stiffness extensible optical bench with alignment monitor systems with a focal length of 12 m. A light-weight silicon mirror with multi-layer coating realizes a high angular resolution of < 15′′ in half-power diameter in the broad bandpass. The imager is a hybrid of a brand-new SOI-CMOS silicon-pixel detector and a CdTe detector responsible for the softer and harder energy bands, respectively. FORCE will play an essential role in the multi-messenger astronomy in the 2030s with its broadband X-ray sensitivity.

    DOI: 10.1117/12.2628772

    Scopus

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MISC 【 display / non-display

  • SXS装置によるかに超新星残骸の熱的プラズマ放射探査 Invited

    辻本匡弘、森浩二

    天文月報   2019.6

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Publisher:日本天文学会  

  • 超新星残骸から探るIa型超新星爆発の親星の金属量

    森浩二

    天文月報   2014.6

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Publisher:日本天文学会  

  • 宮崎県における高等学校と大学との物理教育に関する連絡会

    森浩二、木村英二

    大学の物理教育   2013.11

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    Language:Japanese   Publishing type:Research paper, summary (national, other academic conference)   Publisher:日本物理学会  

  • X線で見る星座

    森浩二

    数研出版株式会社サイエンスネット第37号   37   2009.11

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (other)   Publisher:数研出版株式会社  

  • X線天文衛星 Suzaku および Chandra を用いた小マゼラン星雲中の超新星残骸 0103-72.6 の観測的研究

    川井田英広, 木村結樹, 森浩二

    宮崎大学工学部紀要   ( 37 )   43 - 50   2008.8

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (bulletin of university, research institution)   Publisher:宮崎大学工学部  

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Presentations 【 display / non-display

  • CTA報告202:全体報告

    山本常夏、森浩二、他

    日本物理学会2023年春季大会 

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    Event date: 2023.3.22 - 2023.3.25

    Presentation type:Oral presentation (general)  

  • 宇宙X線観測向け大面積SOIピクセル検出器におけるアナログ信号応答の性能評価

    武田彩希、森浩二、他

    日本物理学会2023年春季大会 

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    Event date: 2023.3.22 - 2023.3.25

    Presentation type:Oral presentation (general)  

  • 広帯域X線の高感度観測衛星 FORCE:2023年春におけるミッション提案の現状

    中澤知洋、森浩二、他

    日本物理学会2023年春季大会 

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    Event date: 2023.3.22 - 2023.3.25

    Presentation type:Oral presentation (general)  

  • X線分光撮像衛星XRISM搭載軟X線撮像装置Xtendの開発の状況 (11)

    野田博文、森浩二、他

    日本物理学会2023年春季大会 

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    Event date: 2023.3.22 - 2023.3.25

    Presentation type:Oral presentation (general)  

  • X 線分光撮像衛星 (XRISM) 搭載軟 X 線撮像装置 (Xtend) の開発の現状 (9)

    信川久実子、森浩二、他

    日本天文学会2023年春季年会 

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    Event date: 2023.3.13 - 2023.3.16

    Presentation type:Oral presentation (general)  

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Awards 【 display / non-display

  • 日本物理学会若手奨励賞

    2009.3   日本物理学会  

    森浩二

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  • 井上研究奨励賞

    2005.2   井上科学振興財団  

    森浩二

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    Award type:Award from publisher, newspaper, foundation, etc.  Country:Japan

Grant-in-Aid for Scientific Research 【 display / non-display

  • 終端衝撃波のX線撮像分光による銀河系内最強加速器「カニ星雲」の加速機構の解明

    Grant number:21H01095  2021.04 - 2026.03

    独立行政法人日本学術振興会  科学研究費補助金  基盤研究(B)

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    Authorship:Principal investigator 

  • カニ星雲のサブ秒角スケールでの精密X線分光による電磁流体加速機構の解明

    Grant number:21J10842  2021.04 - 2023.03

    独立行政法人日本学術振興会  科学研究費補助金  特別研究員奨励費

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    Authorship:Principal investigator 

  • 超新星残骸のX線精密撮像分光から探るIa型超新星の親星の起源

    2019.04 - 2020.03

    科学研究費補助金  基盤研究(B)

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    Authorship:Principal investigator 

  • 超新星残骸のX線精密撮像分光から探るIa型超新星の親星の起源

    2018.04 - 2019.03

    科学研究費補助金  基盤研究(B)

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    Authorship:Principal investigator 

  • 宇宙最初期ブラックホールの探査研究を実現する衛星搭載X線精密イメージングの開拓

    2017.04 - 2018.03

    科学研究費補助金  新学術領域研究

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    Authorship:Coinvestigator(s) 

    SOI CMOS X線検出器の開発

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Other research activities 【 display / non-display

  • 国立天文台ハワイ観測所 Subaru Seminars

    2005.02

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    国立天文台ハワイ観測所において「Recent progress in X-ray studies of the Crab Pulsar Wind Nebula」というタイトルでセミナーをおこなった。

  • 大阪大学理学部X線天文グループセミナー

    2004.12

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    大阪大学理学部X線天文グループに招かれて「パルサー星雲観測の最近の進展」というタイトルでセミナーをおこなった。

Available Technology 【 display / non-display