Faculty Profiles - NAKAMURA Yuya

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NAKAMURA Yuya

Organization

Kobayashi-Maskawa Institute for the Origin of Particles and the Universe (KMI) Designated Assistant Professor

Degree 1

博士（理学）（ 2022.3 名古屋大学）

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Research Areas 1

Natural Science / Particle, nuclear, cosmic-ray, and astrophysics - experiment

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Research History 2

Nagoya University Kobayashi-Maskawa Institute for the Origin of Particles and the Universe (KMI) Designated Assistant Professor

2024.1
Nagoya University Institute of Materials and Systems for Sustainability Advanced Measurement Technology Center Researcher

2022.4 - 2023.12

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Papers 4

New high-precision measurement system for electron–positron pairs from sub-GeV/GeV gamma-rays in the emulsion telescope Open Access

Yuya Nakamura, Shigeki Aoki, Tomohiro Hayakawa, Atsushi Iyono, Ayaka Karasuno, Kohichi Kodama, Ryosuke Komatani, Masahiro Komatsu, Masahiro Komiyama, Kenji Kuretsubo, Toshitsugu Marushima, Syota Matsuda, Kunihiro Morishima, Misaki Morishita, Naotaka Naganawa, Mitsuhiro Nakamura, Motoya Nakamura, Takafumi Nakamura, Noboru Nakano, Toshiyuki Nakano, Akira Nishio, Miyuki Oda, Hiroki Rokujo, Osamu Sato, Kou Sugimura, Atsumu Suzuki, Satoru Takahashi, Mayu Torii, Saya Yamamoto, Masahiro Yoshimoto

Astroparticle Physics Vol. 165 2025.2

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Publishing type：Research paper (scientific journal)

DOI： 10.1016/j.astropartphys.2024.103055

Open Access

Web of Science

Scopus
Nuclear emulsion film production system for experiments in full-area scanning and analysis era Open Access

Hiroki Rokujo, Kou Sugimura, Saya Yamamoto, Hirotaka Hayashi, Mitsuhiro Nakamura, Yuya Nakamura, Toshiyuki Nakano, Osamu Sato, Ikuya Usuda

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment Vol. 1066 2024.9

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Publishing type：Research paper (scientific journal)

DOI： 10.1016/j.nima.2024.169622

Open Access

Web of Science

Scopus
First Emulsion γ-Ray Telescope Imaging of the Vela Pulsar by the GRAINE 2018 Balloon-borne Experiment Open Access

Satoru Takahashi, Shigeki Aoki, Atsushi Iyono, Ayaka Karasuno, Kohichi Kodama, Ryosuke Komatani, Masahiro Komatsu, Masahiro Komiyama, Kenji Kuretsubo, Toshitsugu Marushima, Syota Matsuda, Kunihiro Morishima, Misaki Morishita, Naotaka Naganawa, Mitsuhiro Nakamura, Motoya Nakamura, Takafumi Nakamura, Yuya Nakamura, Noboru Nakano, Toshiyuki Nakano, Kazuma Nakazawa, Akira Nishio, Miyuki Oda, Hiroki Rokujo, Osamu Sato, Kou Sugimura, Atsumu Suzuki, Mayu Torii, Saya Yamamoto, Masahiro Yoshimoto

The Astrophysical Journal Vol. 960 ( 1 ) 2024.1

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Publishing type：Research paper (scientific journal)

<jats:title>Abstract</jats:title>
<jats:p>We are developing the Gamma-Ray Astro-Imager with Nuclear Emulsion project, designed for 10 MeV–100 GeV cosmic <jats:italic>γ</jats:italic>-ray observations with a high angular resolution (5′/0.°08 at 1–2 GeV) and a polarization-sensitive large-aperture (∼10 m<jats:sup>2</jats:sup>) emulsion telescope for repeated long-duration balloon flights. In 2018, a balloon-borne experiment was carried out in Australia with a 0.38 m<jats:sup>2</jats:sup> sensitive area and a flight duration of 17.4 hr, including 6.7 hr of Vela observations. Significant improvements compared with the 2015 balloon-borne experiment were achieved by a factor of 5, including both an increase in effective area × time and a reduction in the background contribution. We aimed to demonstrate the telescope’s overall performance based on detection and imaging of a known <jats:italic>γ</jats:italic>-ray source, the Vela pulsar. A robust detection of the Vela pulsar was achieved with a 68% containment radius of 0.°42, at a significance of 6<jats:italic>σ</jats:italic>, at energies above 80 MeV. The resulting angular profile is consistent with that of a pointlike source. We achieved the current best imaging performance of the Vela pulsar using an emulsion <jats:italic>γ</jats:italic>-ray telescope with the highest angular resolution of any <jats:italic>γ</jats:italic>-ray telescope to date.</jats:p>

DOI： 10.3847/1538-4357/ad0973

Open Access

Web of Science

Scopus
Performance of an emulsion telescope for gamma-ray observations in the GRAINE2018 balloon-borne experiment Reviewed Open Access

Yuya Nakamura, Shigeki Aoki, Atsushi Iyono, Ayaka Karasuno, Kohichi Kodama, Ryosuke Komatani, Masahiro Komatsu, Masahiro Komiyama, Kenji Kuretsubo, Toshitsugu Marushima, Syota Matsuda, Kunihiro Morishima, Misaki Morishita, Naotaka Naganawa, Mitsuhiro Nakamura, Motoya Nakamura, Takafumi Nakamura, Noboru Nakano, Toshiyuki Nakano, Akira Nishio, Miyuki Oda, Hiroki Rokujo, Osamu Sato, Kou Sugimura, Atsumu Suzuki, Satoru Takahashi, Mayu Torii, Saya Yamamoto, Masahiro Yoshimoto

Progress of Theoretical and Experimental Physics 2021.11

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Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

DOI： https://doi.org/10.1093/ptep/ptab148

Open Access

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Presentations 7

GRAINE, Balloon-borne emulsion telescope project for sub-GeV/GeV gamma-ray observation with high angular resolution & polarization sensitivity

Yuya Nakamura, GRAINE collaboration

11th Fermi Symposium 2024.9.13
GRAINE, Balloon-borne emulsion telescope project for precisely sub-GeV/GeV cosmic gamma ray observation

Yuya Nakamura, GRAINE collaboration

COSPAR 2024 2024.7.15
GRAINE: sub-GeV/GeV gamma-ray observation using a balloon-borne telescope equipped with nuclear emulsion films

2025.3.7

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Presentation type：Oral presentation (general)
High energy cosmic gamma-ray polarization & GRAINE balloon experiment International conference

Yuya Nakamura, GRAINE Collaboration

PSTP2026 2026.9.1
GRAINE: sub-GeV/GeV gamma-ray observations with high-angular resolution and polarization sensitivity by the balloon-borne emulsion telescope International conference

ISVHECRI2026 2026.7.9
GRAINE: sub-GeV/GeV gamma-ray observations with high-angular resolution and polarization sensitivity Invited International conference

Yuya Nakamura, GRAINE Collaboration

Frontier Research in Astrophysics 2026 2026.6.20
GRAINE: sub-GeV/GeV gamma-ray observation with a high angular resolution by the balloon-borne emulsion telescope International conference

Yuya Nakamura, GRAINE Collaboration

ICRC2025 2025.7.17

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Presentation type：Oral presentation (general)

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KAKENHI (Grants-in-Aid for Scientific Research) 2

Probing Dark Matter with the Highest Angular Resolution Cosmic Gamma Ray Observations ~Development of the World's Largest Aperture Emulsion Telescope

Grant number：24K00661 2024.4 - 2027.3

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

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Authorship：Coinvestigator(s)
原子核乾板による高エネルギーガンマ線天体の偏光観測の実現

Grant number：22K20382 2022.8 - 2024.3

日本学術振興会科学研究費助成事業研究活動スタート支援

中村悠哉

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Authorship：Principal investigator

Grant amount：\2860000 （ Direct Cost: \2200000 、 Indirect Cost：\660000 ）

原子核乾板望遠鏡を用いた宇宙ガンマ線観測気球実験(GRAINE)において、高エネルギー宇宙γ線偏光観測の実現を目指して、原子核乾板読み取り装置の開発や2023年度実験実施に向けた検出器開発を昨年度から進めてきた。2022年度に望遠鏡の準備を完了し、2023年4月末に予定通り気球実験を実施した。GRAINE実験では初となる24時間以上の長時間フライトを達成し、宇宙γ線偏光観測の第一目標天体となるVelaパルサーだけでなく、暗黒物質起源の可能性がある未知のガンマ線放射が観測されており第二目標となる銀河中心領域の観測時間の確保に初めて成功した。
気象条件などによって当初想定よりも実験準備完了から実験実施までの期間が長くなったこともあり、原子核乾板に記録された飛跡の蓄積量が前回実験よりも数倍増加したが、これらのデータを効率的に読み出すための高速原子核乾板読み取り装置の開発を進め、世界最高速度での原子核乾板読み取りを達成することができた。得られた飛跡データの解析を進め、24時間以上の長時間フライトにおいて、検出機の各要素が狙い通りの性能で動作していたことを実証することができた。
上記の高速読み取り装置のみでは偏光観測を実現するには、読み取り装置の測定精度が不足しているため、2022年度から高精度な原子核乾板読み取り装置の開発を進めてきた。2018年に行った前回のGRAINE気球実験について、開発した高精度読み取り装置を適用してデータの再解析を行ったところ、既存のデータと比べて3倍程度の角度分解能の向上が得られ、原子核乾板の原理限界相当の空間分解能で飛跡データを読み出し可能なことを実証した。本開発についての学術論文も投稿間近であり、今後2023年度気球実験データの解析が進み本装置を適用することで、宇宙γ線偏光観測の実現が期待できる高性能な読み取り装置を開発することができた。

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