Details of the Researcher

PHOTO

Yosuke Ashida
Section
Graduate School of Science
Job title
Assistant Professor
Degree

  • Ph.D (Kyoto University)

  • MS (Kyoto University)

  • BE (Kyoto University)

e-Rad No.
41017751

Research History 7

  • 2025/03 - Present
    Tohoku University　Assistant Professor

  • 2024/10 - 2025/02
    Kyoto University　Postdoctoral Researcher

  • 2023/06 - 2024/09
    University of Utah　Research Associate

  • 2020/06 - 2023/05
    University of Wisconsin-Madison　Research Associate

  • 2020/04 - 2020/05
    Kyoto University　Part-time Research Employee

  • 2017/04 - 2020/03
    Japan Society for the Promotion of Science　Research Fellow (DC1)

  • 2015/06 - 2015/09
    CERN　Summer Student

Show all Show first 5

Education 2

  • Kyoto University　Graduate School of Science　Division of Physics and Astronomy

    2015/04 - 2020/03

  • Kyoto University　Faculty of Engineering　School of Engineering Science

    2011/04 - 2015/03

Professional Memberships 4

  • The Astronomical Society of Japan

    2024/06 - Present

  • Cocmic Ray Researchers Congress (CRC)

    2020/03 - Present

  • The Physical Society of Japan

    2015/10 - Present

  • Japan Association of High Energy Physicists (JAHEP)

    2015/04 - Present

Research Interests 5

  • Supernova Neutrinos

  • High Energy Astrophysical Neutrinos

  • Neutrino-Nucleus Interaction

  • Diffuse Supernova Neutrino Background

  • Neutrino Astronomy

Research Areas 2

  • Natural sciences / Astronomy / Supernova Explosion

  • Natural sciences / Particle, nuclear, cosmic-ray, and astrophysics - experiment / Neutrino Astronomy

Awards 3

  1. The 15th Shorei Award

    2021　Cocmic Ray Researchers Congress (CRC)

  2. The 15th Young Scientist Award (Experimental Particle Physics Field)

    2021　The Physical Society of Japan

  3. The 22nd High Energy Physics Young Researcher’s Award

    2020　Japan Association of High Energy Physicists (JAHEP)

Papers 21

  1. First Associated Neutrino Search for a Failed Supernova Candidate with Super-Kamiokande

    F. Nakanishi, K. Abe, S. Abe, Y. Asaoka, M. Harada, Y. Hayato, K. Hiraide, K. Hosokawa, T. H. Hung, K. Ieki, M. Ikeda, J. Kameda, Y. Kanemura, Y. Kataoka, S. Miki, S. Mine, M. Miura, S. Moriyama, M. Nakahata, S. Nakayama, Y. Noguchi, G. Pronost, K. Sato, H. Sekiya, M. Shiozawa, Y. Suzuki, A. Takeda, Y. Takemoto, H. Tanaka, T. Yano, Y. Itow, T. Kajita, R. Nishijima, K. Okumura, T. Tashiro, T. Tomiya, X. Wang, P. Fernandez, L. Labarga, B. Zaldivar, B. W. Pointon, C. Yanagisawa, E. Kearns, L. Wan, T. Wester, J. Bian, B. Cortez, N. J. Griskevich, Y. Jiang, M. B. Smy, H. W. Sobel, V. Takhistov, A. Yankelevich, J. Hill, M. C. Jang, S. H. Lee, D. H. Moon, R. G. Park, B. S. Yang, B. Bodur, K. Scholberg, C. W. Walter, A. Beauchêne, Le Blévec, O. Drapier, A. Ershova, M. Ferey, Th. A. Mueller, A. D. Santos, P. Paganini, C. Quach, R. Rogly, T. Nakamura, J. S. Jang, R. P. Litchfield, L. N. Machado, F. J. .P Soler, J. G. Learned, K. Choi, S. Cao, L. H. V. Anthony, N. W. Prouse, M. Scott, Y. Uchida, V. Berardi, N. F. Calabria, M. G. Catanesi, N. Ospina, E. Radicioni, A. Langella, G. De Rosa, G. Collazuol, M. Feltre, M. Mattiazzi, L. Ludovici, M. Gonin, L. Périssé, B. Quilain, S. Horiuchi, A. Kawabata, M. Kobayashi, Y. M. Liu, Y. Maekawa, Y. Nishimura, R. Akutsu, M. Friend, T. Hasegawa, Y. Hino, T. Ishida, T. Kobayashi, M. Jakkapu, T. Matsubara, T. Nakadaira, Y. Oyama, A. Portocarrero Yrey, K. Sakashita, T. Sekiguchi, T. Tsukamoto, N. Bhuiyan, G. T. Burton, F. Di Lodovico, J. Gao, T. Katori, R. Kralik, N. Latham, R. M. Ramsden, H. Ito, T. Sone, A. T. Suzuki, Y. Takeuchi, S. Wada, H. Zhong, J. Feng, L. Feng, S. Han, J. Hikida, J. R. Hu, Z. Hu, M. Kawaue, T. Kikawa, T. V. Ngoc, T. Nakaya, R. A. Wendell, S. J. Jenkins, N. McCauley, A. Tarrant, M. Fanì, M. J. Wilking, Z. Xie, Y. Fukuda, H. Menjo, Y. Yoshioka, J. Lagoda, M. Mandal, J. Zalipska, M. Mori, J. Jiang, K. Hamaguchi, H. Ishino, Y. Koshio, T. Tada, T. Ishizuka, G. Barr, D. Barrow, L. Cook, S. Samani, D. Wark, A. Holin, F. Nova, S. Jung, J. Yoo, J. E. P. Fannon, L. Kneale, M. Malek, J. M. McElwee, T. Peacock, P. Stowell, M. D. Thiesse, L. F. Thompson, H. Okazawa, S. M. Lakshmi, E. Kwon, M. W. Lee, J. W. Seo, I. Yu, Y. Ashida, A. K. Ichikawa, K. D. Nakamura, S. Goto, H. Hayasaki, S. Kodama, Y. Kong, Y. Masaki, Y. Mizuno, T. Muro, K. Nakagiri, Y. Nakajima, N. Taniuchi, M. Yokoyama, P. De Perio, S. Fujita, C. Jesús-Valls, K. Martens, Ll. Marti, K. M. Tsui, M. R. Vagins, J. Xia, M. Kuze, S. Izumiyama, R. Matsumoto, R. Asaka, M. Ishitsuka, M. Sugo, M. Wako, K. Yamauchi, Y. Nakano, F. Cormier, R. Gaur, M. Hartz, A. Konaka, X. Li, B. R. Smithers, S. Chen, Y. Wu, B. D. Xu, A. Q. Zhang, B. Zhang, H. Adhikary, M. Girgus, P. Govindaraj, M. Posiadala-Zezula, Y. S. Prabhu, S. B. Boyd, R. Edwards, D. Hadley, M. Nicholson, M. O’Flaherty, B. Richards, A. Ali, B. Jamieson, C. Bronner, D. Horiguchi, A. Minamino, Y. Sasaki, R. Shibayama, R. Shimamura

    The Astrophysical Journal Letters　997　(1)　L9-L9　2026/01/13

    Publisher: American Astronomical Society

    DOI： 10.3847/2041-8213/ae2c73 　

    ISSN： 2041-8205

    eISSN： 2041-8213

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    Abstract In 2024, a failed supernova (SN) candidate, M31-2014-DS1, was reported in the Andromeda galaxy (M31), located at a distance of approximately 770 kpc. In this Letter, we search for neutrinos from this failed SN using data from Super-Kamiokande (SK). Based on the estimated time of black hole formation inferred from optical and infrared observations, we define a search window for neutrino events in the SK data. Using this window, we develop a dedicated analysis method for failed SNe and apply it to M31-2014-DS1, by conducting a cluster search using the timing and energy information of candidate events. No significant neutrino excess is observed within the search region. Consequently, we place an upper limit on the time-integrated electron antineutrino luminosity from M31-2014-DS1 and discuss its implications for various failed SN models and their neutrino emission characteristics. Despite the 18 MeV threshold adopted to suppress backgrounds, the search remains sufficiently sensitive to constrain the Shen-TM1 equation of state, in a more optimistic emission scenario with progenitor stars of 40 M ⊙ and relatively high mean electron-antineutrino energies of about 23.2 MeV, yielding a 90% confidence level upper limit of 1.76 × 10 53 erg on the time-integrated electron antineutrino luminosity, moderately above the expected value of 1.35 × 10 53 erg.

  2. Neutrino Constraints on Black Hole Formation in M31

    Yudai Suwa, Ryuichiro Akaho, Yosuke Ashida, Akira Harada, Masayuki Harada, Yusuke Koshio, Masamitsu Mori, Fumi Nakanishi, Ken'ichiro Nakazato, Kohsuke Sumiyoshi, Roger A. Wendell, Masamichi Zaizen

    The Open Journal of Astrophysics　8　2025/11/11

    Publisher: Maynooth University

    DOI： 10.33232/001c.147127 　

    eISSN： 2565-6120

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    We investigate neutrino signals associated with black hole formation resulting from the gravitational collapse of massive stars, motivated by the candidate failed supernova M31-2014-DS1 in the Andromeda Galaxy (M31). By compiling numerical simulation results for stellar collapse, we predict the expected neutrino emission and compare these predictions with observational limits from Super-Kamiokande (SK). The simulations reveal a characteristic precursor signal consisting of a short, intense burst whose average neutrino energy rises rapidly and then ceases abruptly once the black hole forms. We examine several nuclear equations of state, specifically the Lattimer & Swesty, Shen, Togashi, and SFHo models, to evaluate how the emission depends on neutron-star properties and nuclear-physics uncertainties. Comparison of the predicted event counts with SK’s non-detection of neutrinos coincident with M31-2014-DS1 already rules out part of the model space and highlights the sensitivity of current neutrino detectors to both progenitor mass and the EOS. These findings demonstrate the capability of neutrino astronomy to probe core collapse and black hole formation in failed supernova scenarios.

  3. Observing Supernova Neutrino Light Curves with Super-Kamiokande. VI. A Practical Data Analysis Technique Considering Realistic Experimental Backgrounds

    Fumi Nakanishi, Ken’ichiro Nakazato, Masayuki Harada, Yusuke Koshio, Ryuichiro Akaho, Yosuke Ashida, Akira Harada, Masamitsu Mori, Kohsuke Sumiyoshi, Yudai Suwa, Roger A. Wendell, Masamichi Zaizen

    The Astrophysical Journal　2025/10/10

    DOI： 10.3847/1538-4357/adfcca 　

  4. First measurement of neutron capture multiplicity in neutrino-oxygen neutral-current quasielasticlike interactions using an accelerator neutrino beam

    K. Abe, S. Abe, R. Akutsu, H. Alarakia-Charles, Y. I. Alj Hakim, S. Alonso Monsalve, L. Anthony, S. Aoki, K. A. Apte, T. Arai, T. Arihara, S. Arimoto, Y. Ashida, E. T. Atkin, N. Babu, V. Baranov, G. J. Barker, G. Barr, D. Barrow, P. Bates, L. Bathe-Peters, M. Batkiewicz-Kwasniak, N. Baudis, V. Berardi, L. Berns, S. Bhattacharjee, A. Blanchet, A. Blondel, P. M. M. Boistier, S. Bolognesi, S. Bordoni, S. B. Boyd, C. Bronner, A. Bubak, M. Buizza Avanzini, J. A. Caballero, F. Cadoux, N. F. Calabria, S. Cao, S. Cap, D. Carabadjac, S. L. Cartwright, M. P. Casado, M. G. Catanesi, J. Chakrani, A. Chalumeau, D. Cherdack, A. Chvirova, J. Coleman, G. Collazuol, F. Cormier, A. A. L. Craplet, A. Cudd, D. D’ago, C. Dalmazzone, T. Daret, P. Dasgupta, C. Davis, Yu. I. Davydov, P. de Perio, G. De Rosa, T. Dealtry, C. Densham, A. Dergacheva, R. Dharmapal Banerjee, F. Di Lodovico, G. Diaz Lopez, S. Dolan, D. Douqa, T. A. Doyle, O. Drapier, K. E. Duffy, J. Dumarchez, P. Dunne, K. Dygnarowicz, A. Eguchi, J. Elias, S. Emery-Schrenk, G. Erofeev, A. Ershova, G. Eurin, D. Fedorova, S. Fedotov, M. Feltre, L. Feng, D. Ferlewicz, A. J. Finch, M. D. Fitton, C. Forza, M. Friend, Y. Fujii, Y. Fukuda, Y. Furui, J. García-Marcos, A. C. Germer, L. Giannessi, C. Giganti, M. Girgus, V. Glagolev, M. Gonin, R. González Jiménez, J. González Rosa, E. A. G. Goodman, K. Gorshanov, P. Govindaraj, M. Grassi, M. Guigue, F. Y. Guo, D. R. Hadley, S. Han, D. A. Harris, R. J. Harris, T. Hasegawa, C. M. Hasnip, S. Hassani, N. C. Hastings, Y. Hayato, I. Heitkamp, D. Henaff, Y. Hino, J. Holeczek, A. Holin, T. Holvey, N. T. Hong Van, T. Honjo, M. C. F. Hooft, K. Hosokawa, J. Hu, A. K. Ichikawa, K. Ieki, M. Ikeda, T. Ishida, M. Ishitsuka, H. Ito, S. Ito, A. Izmaylov, N. Jachowicz, S. J. Jenkins, C. Jesús-Valls, M. Jia, J. J. Jiang, J. Y. Ji, T. P. Jones, P. Jonsson, S. Joshi, M. Kabirnezhad, A. C. Kaboth, H. Kakuno, J. Kameda, S. Karpova, V. S. Kasturi, Y. Kataoka, T. Katori, A. Kawabata, Y. Kawamura, M. Kawaue, E. Kearns, M. Khabibullin, A. Khotjantsev, T. Kikawa, S. King, V. Kiseeva, J. Kisiel, A. Klustová, L. Kneale, H. Kobayashi, L. Koch, S. Kodama, M. Kolupanova, A. Konaka, L. L. Kormos, Y. Koshio, K. Kowalik, Y. Kudenko, Y. Kudo, A. Kumar Jha, R. Kurjata, V. Kurochka, T. Kutter, L. Labarga, M. Lachat, K. Lachner, J. Lagoda, S. M. Lakshmi, M. Lamers James, A. Langella, D. H. Langridge, J.-F. Laporte, D. Last, N. Latham, M. Laveder, L. Lavitola, M. Lawe, D. Leon Silverio, S. Levorato, S. V. Lewis, B. Li, C. Lin, R. P. Litchfield, S. L. Liu, W. Li, A. Longhin, A. Lopez Moreno, L. Ludovici, X. Lu, T. Lux, L. N. Machado, L. Magaletti, K. Mahn, K. K. Mahtani, S. Manly, A. D. Marino, D. G. R. Martin, D. A. Martinez Caicedo, L. Martinez, M. Martini, T. Matsubara, R. Matsumoto, V. Matveev, C. Mauger, K. Mavrokoridis, N. McCauley, K. S. McFarland, C. McGrew, J. McKean, A. Mefodiev, G. D. Megias, L. Mellet, C. Metelko, M. Mezzetto, S. Miki, V. Mikola, E. W. Miller, A. Minamino, O. Mineev, S. Mine, J. Mirabito, M. Miura, S. Moriyama, S. Moriyama, P. Morrison, Th. A. Mueller, D. Munford, A. Muñoz, L. Munteanu, Y. Nagai, T. Nakadaira, K. Nakagiri, M. Nakahata, Y. Nakajima, K. D. Nakamura, A. Nakano, Y. Nakano, S. Nakayama, T. Nakaya, K. Nakayoshi, C. E. R. Naseby, D. T. Nguyen, V. Q. Nguyen, K. Niewczas, S. Nishimori, Y. Nishimura, Y. Noguchi, T. Nosek, F. Nova, J. C. Nugent, H. M. O’Keeffe, L. O’Sullivan, R. Okazaki, W. Okinaga, K. Okumura, T. Okusawa, N. Onda, N. Ospina, L. Osu, N. Otani, Y. Oyama, V. Paolone, J. Pasternak, D. Payne, M. Pfaff, L. Pickering, B. Popov, A. J. Portocarrero Yrey, M. Posiadala-Zezula, Y. S. Prabhu, H. Prasad, F. Pupilli, B. Quilain, P. T. Quyen, E. Radicioni, B. Radics, M. A. Ramirez, R. Ramsden, P. N. Ratoff, M. Reh, G. Reina, C. Riccio, D. W. Riley, E. Rondio, S. Roth, N. Roy, A. Rubbia, L. Russo, A. Rychter, W. Saenz, K. Sakashita, S. Samani, F. Sánchez, E. M. Sandford, Y. Sato, T. Schefke, K. Scholberg, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, T. Sekiya, D. Seppala, D. Sgalaberna, A. Shaikhiev, M. Shiozawa, Y. Shiraishi, A. Shvartsman, N. Skrobova, K. Skwarczynski, D. Smyczek, M. Smy, J. T. Sobczyk, H. Sobel, F. J. P. Soler, A. J. Speers, R. Spina, A. Srivastava, P. Stowell, Y. Stroke, I. A. Suslov, A. Suzuki, S. Y. Suzuki, M. Tada, S. Tairafune, A. Takeda, Y. Takeuchi, K. Takeya, H. K. Tanaka, H. Tanigawa, V. V. Tereshchenko, N. Thamm, C. Touramanis, N. Tran, T. Tsukamoto, M. Tzanov, Y. Uchida, M. Vagins, M. Varghese, I. Vasilyev, G. Vasseur, E. Villa, U. Virginet, T. Vladisavljevic, T. Wachala, S.-i. Wada, D. Wakabayashi, H. T. Wallace, J. G. Walsh, D. Wark, M. O. Wascko, A. Weber, R. Wendell, M. J. Wilking, C. Wilkinson, J. R. Wilson, K. Wood, C. Wret, J. Xia, K. Yamamoto, T. Yamamoto, C. Yanagisawa, Y. Yang, T. Yano, N. Yershov, U. Yevarouskaya, M. Yokoyama, Y. Yoshimoto, N. Yoshimura, R. Zaki, A. Zalewska, J. Zalipska, G. Zarnecki, J. Zhang, X. Y. Zhao, H. Zheng, H. Zhong, T. Zhu, M. Ziembicki, E. D. Zimmerman, M. Zito, S. Zsoldos

    Physical Review D　112　(3)　2025/08/06

    Publisher: American Physical Society (APS)

    DOI： 10.1103/qh28-4znk 　

    ISSN： 2470-0010

    eISSN： 2470-0029

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    We report the first measurement of neutron capture multiplicity in neutrino-oxygen neutral-current quasielasticlike interactions at the gadolinium-loaded Super-Kamiokande detector using the T2K neutrino beam, which has a peak energy of about 0.6 GeV. A total of 30 neutral-current quasielasticlike event candidates were selected from T2K data corresponding to an exposure of 1.76×1020 protons on target. The γ ray signals resulting from neutron captures were identified using a neural network. The flux-averaged mean neutron capture multiplicity was measured to be 1.37±0.33 (stat.)−0.27+0.17 (syst.), which is compatible within 2.3 sigma than predictions obtained using our nominal simulation. We discuss potential sources of systematic uncertainty in the prediction and demonstrate that a significant portion of this discrepancy arises from the modeling of hadron-nucleus interactions in the detector medium.

  5. Toward Multienergy Neutrino Astronomy: Diagnosing Enhanced Circumstellar Material around Stripped-envelope Supernovae

    Ryo Sawada, Yosuke Ashida

    The Astrophysical Journal　2025/04/01

    DOI： 10.3847/1538-4357/adb721 　

  6. Performance Evaluation of Electron Multiplier Tubes as a High-Intensity Muon Beam Monitor of Accelerator Neutrino Experiments

    Takashi Honjo, Yosuke Ashida, Oderich F Auersperg-Castell, Megan Friend, Ian Heitkamp, Atsuko K Ichikawa, Masaki Ishitsuka, Nao Izumi, Sohei Kasama, Shigeru Kashiwagi, Yuma Kawamura, Tatsuya Kikawa, Takuya Kobata, Tsunayuki Matsubara, Manabu Miyabe, Kiseki D Nakamura, Hina Nakamura, Yukine Sato, Ken Sakashita, Yoshihiro Seiya, Kouichi Takifuji, Atsushi Tokiyasu, Tatsuya Yamamoto, Kazuhiro Yamamoto, Kenji Yasutome

    Progress of Theoretical and Experimental Physics　2024/12/09

    DOI： 10.1093/ptep/ptae172 　

  7. Measurement of γ-Rays Generated by Neutron Interaction with 16O at 30 MeV and 250 MeV

    T Tano, T Horai, Y Ashida, Y Hino, F Iacob, A Maurel, M Mori, G Collazuol, A Konaka, Y Koshio, T Nakaya, T Shima, R Wendell

    Progress of Theoretical and Experimental Physics　2024/11/11

    DOI： 10.1093/ptep/ptae159 　

  8. Impacts of Black-hole-forming Supernova Explosions on the Diffuse Neutrino Background

    Ken’ichiro Nakazato, Ryuichiro Akaho, Yosuke Ashida, Takuji Tsujimoto

    The Astrophysical Journal　2024/11/01

    DOI： 10.3847/1538-4357/ad7826 　

  9. Characterization of the astrophysical diffuse neutrino flux using starting track events in IceCube

    R. Abbasi, M. Ackermann, J. Adams, S. K. Agarwalla, J. A. Aguilar, M. Ahlers, J. M. Alameddine, N. M. Amin, K. Andeen, G. Anton, C. Argüelles, Y. Ashida, S. Athanasiadou, L. Ausborm, S. N. Axani, X. Bai, A. Balagopal, M. Baricevic, S. W. Barwick, S. Bash, V. Basu, R. Bay, J. J. Beatty, J. Becker Tjus, J. Beise, C. Bellenghi, C. Benning, S. BenZvi, D. Berley, E. Bernardini, D. Z. Besson, E. Blaufuss, S. Blot, F. Bontempo, J. Y. Book, C. Boscolo Meneguolo, S. Böser, O. Botner, J. Böttcher, J. Braun, B. Brinson, J. Brostean-Kaiser, L. Brusa, R. T. Burley, R. S. Busse, D. Butterfield, M. A. Campana, I. Caracas, K. Carloni, J. Carpio, S. Chattopadhyay, N. Chau, Z. Chen, D. Chirkin, S. Choi, B. A. Clark, A. Coleman, G. H. Collin, A. Connolly, J. M. Conrad, P. Coppin, R. Corley, P. Correa, D. F. Cowen, P. Dave, C. De Clercq, J. J. DeLaunay, D. Delgado, S. Deng, K. Deoskar, A. Desai, P. Desiati, K. D. de Vries, G. de Wasseige, T. DeYoung, A. Diaz, J. C. Díaz-Vélez, M. Dittmer, A. Domi, L. Draper, H. Dujmovic, M. A. DuVernois, T. Ehrhardt, L. Eidenschink, A. Eimer, P. Eller, E. Ellinger, S. El Mentawi, D. Elsässer, R. Engel, H. Erpenbeck, J. Evans, P. A. Evenson, K. L. Fan, K. Fang, K. Farrag, A. R. Fazely, A. Fedynitch, N. Feigl, S. Fiedlschuster, C. Finley, L. Fischer, D. Fox, A. Franckowiak, P. Fürst, J. Gallagher, E. Ganster, A. Garcia, E. Genton, L. Gerhardt, A. Ghadimi, C. Girard-Carillo, C. Glaser, T. Glüsenkamp, J. G. Gonzalez, S. Goswami, A. Granados, D. Grant, S. J. Gray, O. Gries, S. Griffin, S. Griswold, K. M. Groth, C. Günther, P. Gutjahr, C. Ha, C. Haack, A. Hallgren, R. Halliday, L. Halve, F. Halzen, H. Hamdaoui, M. Ha Minh, M. Handt, K. Hanson, J. Hardin, A. A. Harnisch, P. Hatch, A. Haungs, J. Häußler, K. Helbing, J. Hellrung, J. Hermannsgabner, L. Heuermann, N. Heyer, S. Hickford, A. Hidvegi, C. Hill, G. C. Hill, K. D. Hoffman, S. Hori, K. Hoshina, M. Hostert, W. Hou, T. Huber, K. Hultqvist, M. Hünnefeld, R. Hussain, K. Hymon, A. Ishihara, W. Iwakiri, M. Jacquart, O. Janik, M. Jansson, G. S. Japaridze, M. Jeong, M. Jin, B. J. P. Jones, N. Kamp, D. Kang, W. Kang, X. Kang, A. Kappes, D. Kappesser, L. Kardum, T. Karg, M. Karl, A. Karle, A. Katil, U. Katz, M. Kauer, J. L. Kelley, M. Khanal, A. Khatee Zathul, A. Kheirandish, J. Kiryluk, S. R. Klein, A. Kochocki, R. Koirala, H. Kolanoski, T. Kontrimas, L. Köpke, C. Kopper, D. J. Koskinen, P. Koundal, M. Kovacevich, M. Kowalski, T. Kozynets, J. Krishnamoorthi, K. Kruiswijk, E. Krupczak, A. Kumar, E. Kun, N. Kurahashi, N. Lad, C. Lagunas Gualda, M. Lamoureux, M. J. Larson, S. Latseva, F. Lauber, J. P. Lazar, J. W. Lee, K. Leonard DeHolton, A. Leszczyńska, J. Liao, M. Lincetto, M. Liubarska, E. Lohfink, C. Love, C. J. Lozano Mariscal, L. Lu, F. Lucarelli, W. Luszczak, Y. Lyu, J. Madsen, E. Magnus, K. B. M. Mahn, Y. Makino, E. Manao, S. Mancina, W. Marie Sainte, I. C. Mariş, S. Marka, Z. Marka, M. Marsee, I. Martinez-Soler, R. Maruyama, F. Mayhew, T. McElroy, F. McNally, J. V. Mead, K. Meagher, S. Mechbal, A. Medina, M. Meier, Y. Merckx, L. Merten, J. Micallef, J. Mitchell, T. Montaruli, R. W. Moore, Y. Morii, R. Morse, M. Moulai, T. Mukherjee, R. Naab, R. Nagai, M. Nakos, U. Naumann, J. Necker, A. Negi, M. Neumann, H. Niederhausen, M. U. Nisa, A. Noell, A. Novikov, S. C. Nowicki, A. Obertacke Pollmann, V. O’Dell, B. Oeyen, A. Olivas, R. Orsoe, J. Osborn, E. O’Sullivan, H. Pandya, N. Park, G. K. Parker, E. N. Paudel, L. Paul, C. Pérez de los Heros, T. Pernice, J. Peterson, S. Philippen, A. Pizzuto, M. Plum, A. Pontén, Y. Popovych, M. Prado Rodriguez, B. Pries, R. Procter-Murphy, G. T. Przybylski, C. Raab, J. Rack-Helleis, K. Rawlins, Z. Rechav, A. Rehman, P. Reichherzer, E. Resconi, S. Reusch, W. Rhode, B. Riedel, A. Rifaie, E. J. Roberts, S. Robertson, S. Rodan, G. Roellinghoff, M. Rongen, A. Rosted, C. Rott, T. Ruhe, L. Ruohan, D. Ryckbosch, I. Safa, J. Saffer, D. Salazar-Gallegos, P. Sampathkumar, A. Sandrock, M. Santander, S. Sarkar, S. Sarkar, J. Savelberg, P. Savina, P. Schaile, M. Schaufel, H. Schieler, S. Schindler, B. Schlüter, F. Schlüter, N. Schmeisser, T. Schmidt, J. Schneider, F. G. Schröder, L. Schumacher, S. Sclafani, D. Seckel, M. Seikh, M. Seo, S. Seunarine, P. Sevle Myhr, R. Shah, S. Shefali, N. Shimizu, M. Silva, B. Skrzypek, B. Smithers, R. Snihur, J. Soedingrekso, A. Søgaard, D. Soldin, P. Soldin, G. Sommani, C. Spannfellner, G. M. Spiczak, C. Spiering, M. Stamatikos, T. Stanev, T. Stezelberger, T. Stürwald, T. Stuttard, G. W. Sullivan, I. Taboada, S. Ter-Antonyan, A. Terliuk, M. Thiesmeyer, W. G. Thompson, J. Thwaites, S. Tilav, K. Tollefson, C. Tönnis, S. Toscano, D. Tosi, A. Trettin, R. Turcotte, J. P. Twagirayezu, M. A. Unland Elorrieta, A. K. Upadhyay, K. Upshaw, A. Vaidyanathan, N. Valtonen-Mattila, J. Vandenbroucke, N. van Eijndhoven, D. Vannerom, J. van Santen, J. Vara, J. Veitch-Michaelis, M. Venugopal, M. Vereecken, S. Verpoest, D. Veske, A. Vijai, C. Walck, A. Wang, C. Weaver, P. Weigel, A. Weindl, J. Weldert, A. Y. Wen, C. Wendt, J. Werthebach, M. Weyrauch, N. Whitehorn, C. H. Wiebusch, D. R. Williams, L. Witthaus, A. Wolf, M. Wolf, G. Wrede, X. W. Xu, J. P. Yanez, E. Yildizci, S. Yoshida, R. Young, S. Yu, T. Yuan, Z. Zhang, P. Zhelnin, P. Zilberman, M. Zimmerman

    Physical Review D　110　(2)　2024/07/02

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevd.110.022001 　

    ISSN： 2470-0010

    eISSN： 2470-0029

  10. Measurement of γ -ray production via the neutron- O16 reaction using a 77 MeV quasimonoenergetic neutron beam

    Y. Ashida, H. Nagata, M. Mori, G. Collazuol, D. Fukuda, T. Horai, F. Iacob, A. Konaka, Y. Koshio, T. Nakaya, C. Nantais, T. Shima, A. Suzuki, Y. Takeuchi, H. Tanaka, R. Wendell, T. Yano

    Physical Review C　2024/01/22

    DOI： 10.1103/PhysRevC.109.014620 　

  11. Diffuse Neutrino Flux Based on the Rates of Core-collapse Supernovae and Black Hole Formation Deduced from a Novel Galactic Chemical Evolution Model

    Yosuke Ashida, Ken’ichiro Nakazato, Takuji Tsujimoto

    The Astrophysical Journal　2023/08/01

    DOI： 10.3847/1538-4357/ace3ba 　

  12. D-Egg: a dual PMT optical module for IceCube

    R. Abbasi, M. Ackermann, J. Adams, N. Aggarwal, J.A. Aguilar, M. Ahlers, J.M. Alameddine, A.A. Alves, N.M. Amin, K. Andeen, T. Anderson, G. Anton, C. Argüelles, Y. Ashida, S. Athanasiadou, S.N. Axani, X. Bai, A. Balagopal V., M. Baricevic, S.W. Barwick, V. Basu, R. Bay, J.J. Beatty, K.-H. Becker, J. Becker Tjus, J. Beise, C. Bellenghi, S. BenZvi, D. Berley, E. Bernardini, D.Z. Besson, G. Binder, D. Bindig, E. Blaufuss, S. Blot, F. Bontempo, J.Y. Book, J. Borowka, C. Boscolo Meneguolo, S. Böser, O. Botner, J. Böttcher, E. Bourbeau, J. Braun, B. Brinson, J. Brostean-Kaiser, R.T. Burley, R.S. Busse, M.A. Campana, E.G. Carnie-Bronca, C. Chen, Z. Chen, D. Chirkin, S. Choi, B.A. Clark, L. Classen, A. Coleman, G.H. Collin, A. Connolly, J.M. Conrad, P. Coppin, P. Correa, S. Countryman, D.F. Cowen, C. Dappen, P. Dave, C. De Clercq, J.J. DeLaunay, D. Delgado López, H. Dembinski, K. Deoskar, A. Desai, P. Desiati, K.D. de Vries, G. de Wasseige, T. DeYoung, A. Diaz, J.C. Díaz-Vélez, M. Dittmer, H. Dujmovic, M.A. DuVernois, T. Ehrhardt, P. Eller, R. Engel, H. Erpenbeck, J. Evans, P.A. Evenson, K.L. Fan, A.R. Fazely, A. Fedynitch, N. Feigl, S. Fiedlschuster, A.T. Fienberg, C. Finley, L. Fischer, D. Fox, A. Franckowiak, E. Friedman, A. Fritz, P. Fürst, T.K. Gaisser, J. Gallagher, E. Ganster, A. Garcia, S. Garrappa, L. Gerhardt, A. Ghadimi, C. Glaser, T. Glauch, T. Glüsenkamp, N. Goehlke, J.G. Gonzalez, S. Goswami, D. Grant, S.J. Gray, T. Grégoire, S. Griffin, S. Griswold, C. Günther, P. Gutjahr, C. Haack, A. Hallgren, R. Halliday, L. Halve, F. Halzen, H. Hamdaoui, M. Ha Minh, K. Hanson, J. Hardin, A.A. Harnisch, P. Hatch, A. Haungs, K. Helbing, J. Hellrung, F. Henningsen, L. Heuermann, S. Hickford, A. Hidvegi, C. Hill, G.C. Hill, K.D. Hoffman, K. Hoshina, W. Hou, T. Huber, K. Hultqvist, M. Hünnefeld, R. Hussain, K. Hymon, S. In, N. Iovine, A. Ishihara, M. Jansson, G.S. Japaridze, M. Jeong, M. Jin, B.J.P. Jones, D. Kang, W. Kang, X. Kang, A. Kappes, D. Kappesser, L. Kardum, T. Karg, M. Karl, A. Karle, U. Katz, M. Kauer, J.L. Kelley, A. Kheirandish, K. Kin, J. Kiryluk, S.R. Klein, A. Kochocki, R. Koirala, H. Kolanoski, T. Kontrimas, L. Köpke, C. Kopper, D.J. Koskinen, P. Koundal, M. Kovacevich, M. Kowalski, T. Kozynets, K. Kruiswijk, E. Krupczak, A. Kumar, E. Kun, N. Kurahashi, N. Lad, C. Lagunas Gualda, M. Lamoureux, M.J. Larson, F. Lauber, J.P. Lazar, J.W. Lee, K. Leonard DeHolton, A. Leszczyńska, M. Lincetto, Q.R. Liu, M. Liubarska, E. Lohfink, C. Love, C.J. Lozano Mariscal, L. Lu, F. Lucarelli, A. Ludwig, W. Luszczak, Y. Lyu, W.Y. Ma, J. Madsen, K.B.M. Mahn, Y. Makino, S. Mancina, W. Marie Sainte, I.C. Mariş, S. Marka, Z. Marka, M. Marsee, I. Martinez-Soler, R. Maruyama, F. Mayhew, T. McElroy, F. McNally, J.V. Mead, K. Meagher, S. Mechbal, A. Medina, M. Meier, S. Meighen-Berger, Y. Merckx, L. Merten, T. Meures, J. Micallef, D. Mockler, T. Montaruli, R.W. Moore, Y. Morii, R. Morse, M. Moulai, T. Mukherjee, R. Naab, R. Nagai, U. Naumann, A. Nayerhoda, J. Necker, M. Neumann, H. Niederhausen, M.U. Nisa, A. Noell, S.C. Nowicki, A. Obertacke Pollmann, M. Oehler, B. Oeyen, A. Olivas, R. Orsoe, J. Osborn, E. O'Sullivan, H. Pandya, D.V. Pankova, N. Park, G.K. Parker, E.N. Paudel, L. Paul, C. Pérez de los Heros, J. Peterson, S. Philippen, S. Pieper, A. Pizzuto, M. Plum, Y. Popovych, M. Prado Rodriguez, B. Pries, R. Procter-Murphy, G.T. Przybylski, C. Raab, J. Rack-Helleis, K. Rawlins, Z. Rechav, A. Rehman, P. Reichherzer, G. Renzi, E. Resconi, S. Reusch, W. Rhode, M. Richman, B. Riedel, E.J. Roberts, S. Robertson, S. Rodan, G. Roellinghoff, M. Rongen, C. Rott, T. Ruhe, L. Ruohan, D. Ryckbosch, D. Rysewyk Cantu, S. Athanasiadou, I. Safa, J. Saffer, D. Salazar-Gallegos, P. Sampathkumar, S.E. Sanchez Herrera, A. Sandrock, P. Sandstrom, M. Santander, S. Sarkar, S. Sarkar, J. Savelberg, P. Savina, M. Schaufel, H. Schieler, S. Schindler, B. Schlüter, T. Schmidt, J. Schneider, F.G. Schröder, L. Schumacher, G. Schwefer, S. Sclafani, D. Seckel, S. Seunarine, A. Sharma, S. Shefali, N. Shimizu, S. Shimizu, M. Silva, B. Skrzypek, B. Smithers, R. Snihur, J. Soedingrekso, A. Søgaard, D. Soldin, C. Spannfellner, G.M. Spiczak, C. Spiering, M. Stamatikos, T. Stanev, R. Stein, T. Stezelberger, T. Stürwald, T. Stuttard, K.H. Sulanke, G.W. Sullivan, I. Taboada, S. Ter-Antonyan, W.G. Thompson, J. Thwaites, S. Tilav, K. Tollefson, C. Tönnis, S. Toscano, D. Tosi, A. Trettin, C.F. Tung, R. Turcotte, J.P. Twagirayezu, B. Ty, M.A. Unland Elorrieta, K. Upshaw, N. Valtonen-Mattila, J. Vandenbroucke, N. van Eijndhoven, D. Vannerom, J. van Santen, J. Vara, J. Veitch-Michaelis, S. Verpoest, D. Veske, C. Walck, T.B. Watson, C. Weaver, J. Weber, P. Weigel, A. Weindl, J. Weldert, C. Wendt, J. Werthebach, M. Weyrauch, N. Whitehorn, C.H. Wiebusch, N. Willey, D.R. Williams, I. Wisher, M. Wolf, G. Wrede, J. Wulff, X.W. Xu, J.P. Yanez, E. Yildizci, S. Yoshida, S. Yu, T. Yuan, Z. Zhang, P. Zhelnin

    Journal of Instrumentation　18　(04)　P04014-P04014　2023/04/01

    Publisher: IOP Publishing

    DOI： 10.1088/1748-0221/18/04/p04014 　

    eISSN： 1748-0221

    More details Close

    Abstract The D-Egg, an acronym for “Dual optical sensors in an Ellipsoid Glass for Gen2,” is one of the optical modules designed for future extensions of the IceCube experiment at the South Pole. The D-Egg has an elongated-sphere shape to maximize the photon-sensitive effective area while maintaining a narrow diameter to reduce the cost and the time needed for drilling of the deployment holes in the glacial ice for the optical modules at depths up to 2700 m. The D-Egg design is utilized for the IceCube Upgrade, the next stage of the IceCube project also known as IceCube-Gen2 Phase 1, where nearly half of the optical sensors to be deployed are D-Eggs. With two 8-inch high-quantum efficiency photomultiplier tubes (PMTs) per module, D-Eggs offer an increased effective area while retaining the successful design of the IceCube digital optical module (DOM). The convolution of the wavelength-dependent effective area and the Cherenkov emission spectrum provides an effective photodetection sensitivity that is 2.8 times larger than that of IceCube DOMs. The signal of each of the two PMTs is digitized using ultra-low-power 14-bit analog-to-digital converters with a sampling frequency of 240 MSPS, enabling a flexible event triggering, as well as seamless and lossless event recording of single-photon signals to multi-photons exceeding 200 photoelectrons within 10 ns. Mass production of D-Eggs has been completed, with 277 out of the 310 D-Eggs produced to be used in the IceCube Upgrade. In this paper, we report the design of the D-Eggs, as well as the sensitivity and the single to multi-photon detection performance of mass-produced D-Eggs measured in a laboratory using the built-in data acquisition system in each D-Egg optical sensor module.

  13. Exploring the Fate of Stellar Core Collapse with Supernova Relic Neutrinos

    Yosuke Ashida, Ken’ichiro Nakazato

    The Astrophysical Journal　2022/09/01

    DOI： 10.3847/1538-4357/ac8a46 　

  14. Search for solar electron anti-neutrinos due to spin-flavor precession in the Sun with Super-Kamiokande-IV

    K. Abe, C. Bronner, Y. Hayato, M. Ikeda, S. Imaizumi, H. Ito, J. Kameda, Y. Kataoka, M. Miura, S. Moriyama, Y. Nagao, M. Nakahata, Y. Nakajima, S. Nakayama, T. Okada, K. Okamoto, A. Orii, G. Pronos, H. Sekiya, M. Shiozawa, Y. Sonoda, Y. Suzuki, A. Takeda, Y. Takemoto, A. Takenaka, H. Tanaka, T. Yano, R. Akutsu, S. Han, T. Kajita, K. Okumura, T. Tashiro, R. Wang, J. Xia, D. Bravo-Bergu{\~{n } }o, L. Labarga, Ll. Marti, B. Zaldivar, F.d.M. Blaszczyk, E. Kearns, J.L. Raaf, J.L. Stone, L. Wan, T. Wester, B.W. Pointon, J. Bian, N.J. Griskevich, W.R. Krop, S. Locke, S. Mine, M.B. Smy, H.W. Sobel, V. Takhistov, P. Weatherly, J. Hill, J.Y. Kim, I.T. Lim, R.G. Park, B. Bodur, K. Scholberg, C.W. Walter, L. Bernard, A. Coffani, O. Drapier, S. El Hedri, A. Giampaolo, M. Gonin, Th.A. Mueller, P. Paganini, B. Quilain, T. Ishizuka, T. Nakamura, J.S. Jang, J.G. Learned, L.H.V. Anthony, A.A. Sztuc, Y. Uchida, V. Berardi, M.G. Catanesi, E. Radicioni, N.F. Calabria, L.N. Machado, G. De Rosa, G. Collazuol, F. Iacob, M. Lamoureux, N. Ospina, L. Ludovici, Y. Nishimura, S. Cao, M. Friend, T. Hasegawa, T. Ishida, M. Jakkapu, T. Kobayashi, T. Matsubara, T. Nakadaira, K. Nakamura, Y. Oyama, K. Sakashita, T. Sekiguchi, T. Tsukamoto, Y. Nakano, T. Shiozawa, A.T. Suzuki, Y. Takeuchi, S. Yamamoto, A. Ali, Y. Ashida, J. Feng, S. Hirota, A.K. Ichikawa, T. Kikawa, M. Mori, T. Nakaya, R.A. Wendell, Y. Yasutome, P. Fernandez, N. McCauley, P. Mehta, A. Pritchard, K.M. Tsui, Y. Fukuda, Y. Itow, H. Menjo, T. Niwa, K. Sato, M. Tsukada, P. Mijakowski, C.K. Jung, C. Vilela, M.J. Wilking, C. Yanagisawa, M. Harada, K. Hagiwara, T. Horai, H. Ishino, S. Ito, Y. Koshio, W. Ma, N. Piplani, S. Sakai, Y. Kuno, G. Barr, D. Barrow, L. Cook, A. Goldsack, S. Samani, C. Simpson, D. Wark, F. Nova, T. Boschi, F. Di Lodovico, M. Taani, J. Migenda, S. Molina Sedgwick, S. Zsoldos, J.Y. Yang, S.J. Jenkins, M. Malek, J.M. McElwee, O. Stone, M.D. Thiesse, L.F. Thompson, H. Okazawa, S.B. Kim, I. Yu, K. Nishijima, M. Koshiba, K. Iwamoto, N. Ogawa, M. Yokoyama, K. Martens, M.R. Vagins, S. Izumiyama, M. Kuze, M. Tanaka, T. Yoshida, M. Inomoto, M. Ishitsuka, R. Matsumoto, K. Ohta, M. Shinoki, J.F. Martin, H.A. Tanaka, T. Towstego, M. Hartz, A. Konaka, P. de Perio, N.W. Prouse, S. Chen, B.D. Xu, B. Richards, B. Jamieson, J. Walker, A. Minamino, K. Okamoto, G. Pintaudi, R. Sasaki, M. Posiadala-Zezula

    Astroparticle Physics　139　102702-102702　2022/06

    Publisher: Elsevier {BV}

    DOI： 10.1016/j.astropartphys.2022.102702 　

    ISSN： 0927-6505

  15. Diffuse supernova neutrino background search at Super-Kamiokande

    K. Abe, C. Bronner, Y. Hayato, K. Hiraide, M. Ikeda, S. Imaizumi, J. Kameda, Y. Kanemura, Y. Kataoka, S. Miki, M. Miura, S. Moriyama, Y. Nagao, M. Nakahata, S. Nakayama, T. Okada, K. Okamoto, A. Orii, G. Pronos, H. Sekiya, M. Shiozawa, Y. Sonoda, Y. Suzuki, A. Takeda, Y. Takemoto, A. Takenaka, H. Tanaka, S. Watanabe, T. Yano, S. Han, T. Kajita, K. Okumura, T. Tashiro, J. Xia, G.{\hspace, m } }D. Megias, D. Bravo-Bergu{\~{n } }o, L. Labarga, Ll. Marti, B. Zaldivar, B.{\hspace, W. Pointon, F.{\hspace, d.{\hspace, m } }M. Blaszczyk, E. Kearns, J.{\hspace, m } }L. Raaf, J.{\hspace, m } }L. Stone, L. Wan, T. Wester, J. Bian, N.{\hspace, m } }J. Griskevich, W.{\hspace, m } }R. Krop, S. Locke, S. Mine, M.{\hspace, m } }B. Smy, H.{\hspace, m } }W. Sobel, V. Takhistov, J. Hill, J.{\hspace, m } }Y. Kim, I.{\hspace, m } }T. Lim, R.{\hspace, m } }G. Park, B. Bodur, K. Scholberg, C.{\hspace, W. Walter, S. Cao, L. Bernard, A. Coffani, O. Drapier, S. El Hedri, A. Giampaolo, M. Gonin, Th.{\hspace, A. Mueller, P. Paganini, B. Quilain, T. Ishizuka, T. Nakamura, J.{\hspace, m } }S. Jang, J.{\hspace, G. Learned, L.{\hspace, H.{\hspace, m } }V. Anthony, D. Martin, M. Sco, A.{\hspace, m } }A. Sztuc, Y. Uchida, V. Berardi, M.{\hspace, m } }G. Catanesi, E. Radicioni, N.{\hspace, F. Calabria, L.{\hspace, m } }N. Machado, G. De Rosa, G. Collazuol, F. Iacob, M. Lamoureux, M. Mattiazzi, N. Ospina, L. Ludovici, Y. Maekawa, Y. Nishimura, M. Friend, T. Hasegawa, T. Ishida, T. Kobayashi, M. Jakkapu, T. Matsubara, T. Nakadaira, K. Nakamura, Y. Oyama, K. Sakashita, T. Sekiguchi, T. Tsukamoto, Y. Kotsar, Y. Nakano, H. Ozaki, T. Shiozawa, A.{\hspace, m } }T. Suzuki, Y. Takeuchi, S. Yamamoto, A. Ali, Y. Ashida, J. Feng, S. Hirota, T. Kikawa, M. Mori, T. Nakaya, R.{\hspace, m } }A. Wendell, K. Yasutome, P. Fernandez, N. McCauley, P. Mehta, K.{\hspace, m } }M. Tsui, Y. Fukuda, Y. Itow, H. Menjo, T. Niwa, K. Sato, M. Tsukada, J. Lagoda, S.{\hspace, m } }M. Lakshmi, P. Mijakowski, J. Zalipska, J. Jiang, C.{\hspace, m } }K. Jung, C. Vilela, M.{\hspace, m } }J. Wilking, C. Yanagisawa, K. Hagiwara, M. Harada, T. Horai, H. Ishino, S. Ito, H. Kitagawa, Y. Koshio, W. Ma, N. Piplani, S. Sakai, G. Barr, D. Barrow, L. Cook, A. Goldsack, S. Samani, D. Wark, F. Nova, T. Boschi, F. Di Lodovico, J. Gao, J. Migenda, M. Taani, S. Zsoldos, J.{\hspace, m } }Y. Yang, S.{\hspace, m } }J. Jenkins, M. Malek, J.{\hspace, m } }M. McElwee, O. Stone, M.{\hspace, m } }D. Thiesse, L.{\hspace, m } }F. Thompson, H. Okazawa, S.{\hspace, B. Kim, J.{\hspace, m } }W. Seo, I. Yu, K. Nishijima, M. Koshiba, K. Iwamoto, K. Nakagiri, Y. Nakajima, N. Ogawa, M. Yokoyama, K. Martens, M.{\hspace, m } }R. Vagins, M. Kuze, S. Izumiyama, T. Yoshida, M. Inomoto, M. Ishitsuka, H. Ito, T. Kinoshita, R. Matsumoto, K. Ohta, M. Shinoki, T. Suganuma, A.{\hspace, m } }K. Ichikawa, K. Nakamura, J.{\hspace, F. Martin, H.{\hspace, m } }A. Tanaka, T. Towstego, R. Akutsu, V. Gousy-Leblanc, M. Hartz, A. Konaka, P. de Perio, N.{\hspace, m } }W. Prouse, S. Chen, B.{\hspace, m } }D. Xu, Y. Zhang, M. Posiadala-Zezula, D. Hadley, M. O'Flaherty, B. Richards, B. Jamieson, J. Walker, A. Minamino, K. Okamoto, G. Pintaudi, S. Sano, R. Sasaki and

    Physical Review D　104　(12)　2021/12/10

    Publisher: American Physical Society ({APS})

    DOI： 10.1103/physrevd.104.122002 　

    ISSN： 2470-0010 2470-0029

  16. Measurement of neutrino and antineutrino neutral-current quasielasticlike interactions on oxygen by detecting nuclear deexcitation γ rays

    K. Abe, R. Akutsu, A. Ali, C. Alt, C. Andreopoulos, L. Anthony, M. Antonova, S. Aoki, A. Ariga, Y. Ashida, E. T. Atkin, Y. Awataguchi, S. Ban, M. Barbi, G. J. Barker, G. Barr, C. Barry, M. Batkiewicz-Kwasniak, A. Beloshapkin, F. Bench, V. Berardi, S. Berkman, L. Berns, S. Bhadra, S. Bienstock, A. Blondel, S. Bolognesi, B. Bourguille, S. B. Boyd, D. Brailsford, A. Bravar, D. Bravo Berguño, C. Bronner, A. Bubak, M. Buizza Avanzini, J. Calcutt, T. Campbell, S. Cao, S. L. Cartwright, M. G. Catanesi, A. Cervera, A. Chappell, C. Checchia, D. Cherdack, N. Chikuma, G. Christodoulou, J. Coleman, G. Collazuol, L. Cook, D. Coplowe, A. Cudd, A. Dabrowska, G. De Rosa, T. Dealtry, P. F. Denner, S. R. Dennis, C. Densham, F. Di Lodovico, N. Dokania, S. Dolan, O. Drapier, J. Dumarchez, P. Dunne, L. Eklund, S. Emery-Schrenk, A. Ereditato, P. Fernandez, T. Feusels, A. J. Finch, G. A. Fiorentini, G. Fiorillo, C. Francois, M. Friend, Y. Fujii, R. Fujita, D. Fukuda, R. Fukuda, Y. Fukuda, K. Gameil, C. Giganti, T. Golan, M. Gonin, A. Gorin, M. Guigue, D. R. Hadley, J. T. Haigh, P. Hamacher-Baumann, M. Hartz, T. Hasegawa, N. C. Hastings, T. Hayashino, Y. Hayato, A. Hiramoto, M. Hogan, J. Holeczek, N. T. Hong Van, F. Iacob, A. K. Ichikawa, M. Ikeda, T. Ishida, T. Ishii, M. Ishitsuka, K. Iwamoto, A. Izmaylov, B. Jamieson, S. J. Jenkins, C. Jesús-Valls, M. Jiang, S. Johnson, P. Jonsson, C. K. Jung, M. Kabirnezhad, A. C. Kaboth, T. Kajita, H. Kakuno, J. Kameda, D. Karlen, S. P. Kasetti, Y. Kataoka, T. Katori, Y. Kato, E. Kearns, M. Khabibullin, A. Khotjantsev, T. Kikawa, H. Kim, J. Kim, S. King, J. Kisiel, A. Knight, A. Knox, T. Kobayashi, L. Koch, T. Koga, A. Konaka, L. L. Kormos, Y. Koshio, K. Kowalik, H. Kubo, Y. Kudenko, N. Kukita, S. Kuribayashi, R. Kurjata, T. Kutter, M. Kuze, L. Labarga, J. Lagoda, M. Lamoureux, M. Laveder, M. Lawe, M. Licciardi, T. Lindner, R. P. Litchfield, S. L. Liu, X. Li, A. Longhin, L. Ludovici, X. Lu, T. Lux, L. N. Machado, L. Magaletti, K. Mahn, M. Malek, S. Manly, L. Maret, A. D. Marino, J. F. Martin, T. Maruyama, T. Matsubara, K. Matsushita, V. Matveev, K. Mavrokoridis, E. Mazzucato, M. McCarthy, N. McCauley, K. S. McFarland, C. McGrew, A. Mefodiev, C. Metelko, M. Mezzetto, A. Minamino, O. Mineev, S. Mine, M. Miura, L. Molina Bueno, S. Moriyama, J. Morrison, Th. A. Mueller, L. Munteanu, S. Murphy, Y. Nagai, T. Nakadaira, M. Nakahata, Y. Nakajima, A. Nakamura, K. G. Nakamura, K. Nakamura, S. Nakayama, T. Nakaya, K. Nakayoshi, C. Nantais, T. V. Ngoc, K. Niewczas, K. Nishikawa, Y. Nishimura, T. S. Nonnenmacher, F. Nova, P. Novella, J. Nowak, J. C. Nugent, H. M. O’Keeffe, L. O’Sullivan, T. Odagawa, K. Okumura, T. Okusawa, S. M. Oser, R. A. Owen, Y. Oyama, V. Palladino, J. L. Palomino, V. Paolone, W. C. Parker, P. Paudyal, M. Pavin, D. Payne, G. C. Penn, L. Pickering, C. Pidcott, E. S. Pinzon Guerra, C. Pistillo, B. Popov, K. Porwit, M. Posiadala-Zezula, A. Pritchard, B. Quilain, T. Radermacher, E. Radicioni, B. Radics, P. N. Ratoff, E. Reinherz-Aronis, C. Riccio, E. Rondio, S. Roth, A. Rubbia, A. C. Ruggeri, A. Rychter, K. Sakashita, F. Sánchez, C. M. Schloesser, K. Scholberg, J. Schwehr, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, D. Sgalaberna, R. Shah, A. Shaikhiev, F. Shaker, A. Shaykina, M. Shiozawa, W. Shorrock, A. Shvartsman, A. Smirnov, M. Smy, J. T. Sobczyk, H. Sobel, F. J. P. Soler, Y. Sonoda, J. Steinmann, S. Suvorov, A. Suzuki, S. Y. Suzuki, Y. Suzuki, A. A. Sztuc, M. Tada, M. Tajima, A. Takeda, Y. Takeuchi, H. K. Tanaka, H. A. Tanaka, S. Tanaka, L. F. Thompson, W. Toki, C. Touramanis, K. M. Tsui, T. Tsukamoto, M. Tzanov, Y. Uchida, W. Uno, M. Vagins, S. Valder, Z. Vallari, D. Vargas, G. Vasseur, C. Vilela, W. G. S. Vinning, T. Vladisavljevic, V. V. Volkov, T. Wachala, J. Walker, J. G. Walsh, Y. Wang, D. Wark, M. O. Wascko, A. Weber, R. Wendell, M. J. Wilking, C. Wilkinson, J. R. Wilson, R. J. Wilson, K. Wood, C. Wret, Y. Yamada, K. Yamamoto, C. Yanagisawa, G. Yang, T. Yano, K. Yasutome, S. Yen, N. Yershov, M. Yokoyama, T. Yoshida, M. Yu, A. Zalewska, J. Zalipska, K. Zaremba, G. Zarnecki, M. Ziembicki, E. D. Zimmerman, M. Zito, S. Zsoldos, A. Zykova

    Physical Review D　100　(11)　2019/12/30

    Publisher: American Physical Society ({APS})

    DOI： 10.1103/PhysRevD.100.112009 　

  17. A new electron-multiplier-tube-based beam monitor for muon monitoring at the T2K experiment

    Y Ashida, M Friend, A K Ichikawa, T Ishida, H Kubo, K G Nakamura, K Sakashita, W Uno

    Progress of Theoretical and Experimental Physics　2018　(10)　2018/10/01

    Publisher: Oxford University Press ({OUP})

    DOI： 10.1093/ptep/pty104 　

    ISSN： 2050-3911

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    <jats:title>Abstract</jats:title> <jats:p>Muon beam monitoring is indispensable for indirectly monitoring accelerator-produced neutrino beams in real time. Though Si photodiodes and ionization chambers have been successfully used as muon monitors at the T2K experiment, sensors that are more radiation tolerant are desired for future operation. We have investigated the electron-multiplier tube (EMT) as a new sensor for muon monitoring. Secondary electrons produced by the passage of muons at dynodes are multiplied in the tube and produce signal. Two prototype detectors were installed at the T2K muon monitor location, and various EMT properties were studied based on in situ data taken with the T2K muon beam. The signal size is as expected based on calculation, and the EMTs show a sufficiently fast time response for bunch-by-bunch beam monitoring. The spill-by-spill intensity resolution is 0.4%, better than the required value (1%). Signal linearity within $\pm$1% is achieved at proton beam powers up to 460 kW (with +250 kA focusing horn operation). A gradual signal decrease was observed during the initial exposure, due to the stabilization of dynode materials, before the response became stable within $\pm$1%. This work demonstrates that EMTs are a good candidate for future muon monitoring at T2K, and may also have other more general applications.</jats:p>

  18. Separation of gamma-ray and neutron events with CsI(Tl) pulse shape analysis

    Y Ashida, H Nagata, Y Koshio, T Nakaya, R Wendell

    Progress of Theoretical and Experimental Physics　2018　(4)　2018/04/01

    Publisher: Oxford University Press ({OUP})

    DOI： 10.1093/ptep/pty040 　

    ISSN： 2050-3911

  19. Interaction-powered Type Ibn Supernovae as a Transient PeVatron Candidate: The Case of SN 2023uqf

    Ryo Sawada, Yusuke Inoue, Yosuke Ashida

    The Astrophysical Journal Letters　1005　(2)　L70-L70　2026/07/08

    Publisher: American Astronomical Society

    DOI： 10.3847/2041-8213/ae80bd 　

    ISSN： 2041-8205

    eISSN： 2041-8213

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    Abstract We investigate whether the Type Ibn supernova SN 2023uqf, reported close in time and direction to the ∼442 TeV IceCube alert IC-231004A, is physically consistent with a shock–circumstellar medium (CSM) interaction scenario. One-dimensional radiation-hydrodynamic calculations with STELLA reproduce the Zwicky Transient Facility (ZTF) optical light curves with a dense, helium-rich CSM following ρ CSM  ∝  r −3 and CSM density parameter . Using the shock evolution and CSM conditions obtained from the optical-fit radiation-hydrodynamic model, we model time-dependent cosmic-ray acceleration and hadronic neutrino production during the interaction phase. In our fiducial model, the inferred shock and CSM properties open a short-lived window in which multi-PeV hadron acceleration and efficient hadronic interactions can coexist. Additional loss-limited effects could reduce the high-energy cutoff, but the model provides a useful optical-to-neutrino consistency test for a transient PeVatron-like phase. After folding the predicted neutrino emission through the IceCube effective area, we obtain an expected number of ∼10 −5 –10 −4 track-like events at d = 723 Mpc, depending on the alert selection. In the low-count regime, the model predicts a detection-time weighting for a rare event, and the detection time of IC-231004A falls within the high-weight interval, while its energy scale is compatible with the modeled spectrum. Although a single event cannot establish a definitive association, our results show that the optically inferred environment of SN 2023uqf can satisfy the basic timing and energy requirements for a transient PeVatron-like phase in the fiducial model and illustrate how interaction-powered Type Ibn supernovae can be tested as high-energy neutrino sources.

  20. Search for Diffuse Supernova Neutrino Background with 956.2 Days of Super-Kamiokande Gadolinium Dataset

    K. Abe, S. Abe, Y. Asaoka, M. Harada, Y. Hayato, K. Hiraide, K. Hosokawa, T. H. Hung, K. Ieki, M. Ikeda, J. Kameda, Y. Kanemura, Y. Kataoka, S. Miki, S. Mine, M. Miura, S. Moriyama, M. Nakahata, S. Nakayama, Y. Noguchi, G. Pronost, K. Sato, H. Sekiya, R. Shinoda, M. Shiozawa, Y. Suzuki, A. Takeda, Y. Takemoto, H. Tanaka, T. Yano, Y. Itow, T. Kajita, R. Nishijima, K. Okumura, T. Tashiro, T. Tomiya, X. Wang, P. Fernandez, L. Labarga, D. Samudio, B. Zaldivar, C. Yanagisawa, E. Kearns, J. Mirabito, L. Wan, T. Wester, B. W. Pointon, J. Bian, B. Cortez, N. J. Griskevich, Y. Jiang, M. B. Smy, H. W. Sobel, V. Takhistov, A. Yankelevich, J. Hill, M. C. Jang, S. H. Lee, D. H. Moon, R. G. Park, B. S. Yang, B. Bodur, K. Scholberg, C. W. Walter, A. Beauchêne, E. Le Blévec, O. Drapier, A. Ershova, M. Ferey, Th. A. Mueller, A. D. Santos, P. Paganini, C. Quach, R. Rogly, T. Nakamura, J. S. Jang, R. P. Litchfield, L. N. Machado, F. J. P. Soler, J. G. Learned, K. Choi, S. Cao, L. H. V. Anthony, N. W. Prouse, M. Scott, Y. Uchida, V. Berardi, N. F. Calabria, M. G. Catanesi, N. Ospina, E. Radicioni, A. Langella, G. De Rosa, G. Collazuol, M. Feltre, M. Mattiazzi, L. Ludovici, M. Gonin, L. Périssé, B. Quilain, S. Horiuchi, A. Kawabata, M. Kobayashi, Y. M. Liu, Y. Maekawa, Y. Nishimura, R. Akutsu, M. Friend, T. Hasegawa, Y. Hino, T. Ishida, T. Kobayashi, M. Jakkapu, T. Matsubara, T. Nakadaira, Y. Oyama, A. Portocarrero Yrey, K. Sakashita, T. Sekiguchi, T. Tsukamoto, N. Bhuiyan, G. T. Burton, F. Di Lodovico, J. Gao, T. Katori, R. Kralik, N. Latham, R. M. Ramsden, H. Ito, T. Sone, A. T. Suzuki, Y. Takeuchi, S. Wada, H. Zhong, J. Feng, L. Feng, S. Han, J. Hikida, J. R. Hu, Z. Hu, M. Kawaue, T. Kikawa, T. Nakaya, T. V. Ngoc, R. A. Wendell, S. J. Jenkins, N. McCauley, A. Tarrant, M. Fanì, M. J. Wilking, Z. Xie, Y. Fukuda, H. Menjo, Y. Yoshioka, J. Lagoda, M. Mandal, J. Zalipska, M. Mori, J. Jiang, K. Hamaguchi, H. Ishino, Y. Koshio, F. Nakanishi, T. Tada, T. Ishizuka, G. Barr, D. Barrow, L. Cook, S. Samani, D. Wark, A. Holin, F. Nova, S. Jung, J. Yoo, J. E. P. Fannon, L. Kneale, M. Malek, J. M. McElwee, T. Peacock, P. Stowell, M. D. Thiesse, L. F. Thompson, H. Okazawa, S. M. Lakshmi, E. Kwon, M. W. Lee, J. W. Seo, I. Yu, Y. Ashida, A. K. Ichikawa, K. D. Nakamura, S. Goto, H. Hayasaki, S. Kodama, Y. Kong, Y. Masaki, Y. Mizuno, T. Muro, K. Nakagiri, Y. Nakajima, N. Taniuchi, M. Yokoyama, P. de Perio, S. Fujita, C. Jesús-Valls, K. Martens, Ll. Marti, K. M. Tsui, M. R. Vagins, J. Xia, M. Kuze, S. Izumiyama, R. Matsumoto, R. Asaka, M. Ishitsuka, M. Sugo, M. Wako, K. Yamauchi, Y. Nakano, F. Cormier, R. Gaur, M. Hartz, A. Konaka, X. Li, B. R. Smithers, S. Chen, Y. Wu, B. D. Xu, A. Q. Zhang, B. Zhang, H. Adhikary, M. Girgus, P. Govindaraj, M. Posiadala-Zezula, Y. S. Prabhu, S. B. Boyd, R. Edwards, D. Hadley, M. Nicholson, M. O’Flaherty, B. Richards, A. Ali, B. Jamieson, C. Bronner, D. Horiguchi, A. Minamino, Y. Sasaki, R. Shibayama, R. Shimamura

    The Astrophysical Journal　1005　(1)　101-101　2026/06/29

    Publisher: American Astronomical Society

    DOI： 10.3847/1538-4357/ae6c20 　

    ISSN： 0004-637X

    eISSN： 1538-4357

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    Abstract We report the search result for the Diffuse Supernova Neutrino Background (DSNB) in neutrino energies beyond 9.3 MeV in the gadolinium-loaded Super-Kamiokande (SK) detector with a 22,500 × 956.2 m 3 day exposure. Starting in the summer of 2020, SK introduced 0.01% gadolinium (Gd) by mass into its ultrapure water to enhance the neutron capture signal, termed the SK-VI phase. This was followed by a 0.03% Gd-loading in 2022, a phase referred to as SK-VII. We then conducted a DSNB search using 552.2 days of SK-VI data and 404.0 days of SK-VII data through 2023 September. This analysis includes several new features, such as two new machine learning neutron detection algorithms with Gd, an improved atmospheric background-reduction technique, and two parallel statistical approaches. No significant excess over background predictions was found in a DSNB spectrum-independent analysis, and 90% confidence level (C.L.) upper limits on the astrophysical electron antineutrino flux were set. Additionally, a spectral fitting result exhibited a ∼1.2 σ disagreement with a null DSNB hypothesis, comparable to a previous result from 5823 days of all SK pure-water phases.

  21. A simulation model investigation of neutron-oxygen inelastic scattering and subsequent nucleus deexcitation based on experimental data

    Y. Hino, Y. Ashida, T. Tano, Y. Koshio

    The European Physical Journal C　86　(2)　2026/02/13

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1140/epjc/s10052-026-15355-2 　

    eISSN： 1434-6052

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    Abstract The nuclear interaction model plays an essential role in understanding neutrino-nucleus interactions in large-scale neutrino detectors. For example, in the Super-Kamiokande experiment, systematic uncertainties regarding atmospheric neutrino interactions on oxygen limit the sensitivity to some physics studies, such as the diffuse supernova neutrino background search. Reduction of such uncertainties necessitates an accurate modeling of nuclear reactions and subsequent nuclear deexcitation. For this purpose, a detailed study was performed by comparing various combinations of simulation models with the newly released neutron experimental data. From this study, it is found that the combination of INCL++ and NucDeEx implemented in a Geant4-based simulation shows a better agreement with the experimental data. The presented result will be referred to improve the future physics studies at neutrino detectors, including the current focus of Super-Kamiokande.

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Research Projects 6

  1. 背景事象の理解向上で実現する超新星背景ニュートリノの史上初観測

    芦田 洋輔, 原田 将之, 中野 佑樹

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(B)

    Institution: 東北大学

    2026/04 - 2030/03

  2. Enhancing Astronomy by Neutrino Observations over Wide Energy Range

    Yosuke Ashida

    Offer Organization: Inamori Foundation

    System: Inamori Research Grants “Incubate” Course

    2026/04 - 2028/03

  3. 複数検出器での超新星背景ニュートリノ探索のための解析手法の開発

    芦田 洋輔

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 研究活動スタート支援

    Institution: 東北大学

    2025/07 - 2027/03

  4. 神岡地下ニュートリノ検出器による超新星ニュートリノ観測データの解析手法の開発

    原田 了, 住吉 光介, 中里 健一郎, 諏訪 雄大, 財前 真理, 森 正光, 小汐 由介, 中西 史美, 原田 将之, ウェンデル ロジャー, 芦田 洋輔, 赤穂 龍一郎

    Offer Organization: 東京大学宇宙線研究所

    System: 宇宙線研究所共同利用研究

    2025/04 - 2026/03

  5. Search for supernova relic neutrinos by improving neutrino neutral current cross section measurement

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for JSPS Fellows

    Institution: Kyoto University

    2017/04/26 - 2020/03/31

  6. Study of the gamma-ray generation via neutrino-oxygen neutral current interaction

    Koshio Yusuke, ASHIDA Yosuke, NAGATA Hirotaka, SHIRAHIGE Tetsuya, HUANG Kunxian, KAYANO Tsubasa

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Okayama University

    2014/04 - 2017/03

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    This study is to measure the neutral current quasielastic scattering which has not been measured so far with high accuracy by measuring the deexcited gamma rays generated by the reaction of neutrinos with oxygen nuclei in the T2K experiment. In the first year we succeeded in measuring this reaction for the first time in the world. However, the measurement error is quite large. In this study, we have proposed and performed a completely new experiment using a neutron beam to reduce the largest error due to the reaction of the neutron in water, which was not systematically understood. In this study, the reaction cross section and the energy of gamma rays generated have been measured, and the understanding thereof has advanced dramatically.

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Media Coverage 9

  1. 可視光とニュートリノで探る超新星における粒子加速の可能性

    東北大学

    2026/08

    Type: Internet

  2. 「超新星背景ニュートリノ」の存在示す“兆候”初めて捉えたか

    NHK

    2026/07

    Type: TV or radio program

  3. 超新星は宇宙の巨大粒子加速器か －可視光とニュートリノで探るペバトロン候補－

    理化学研究所

    2026/07

    Type: Internet

  4. スーパーカミオカンデが超新星背景ニュートリノの兆候を捉える― 宇宙の歴史に刻まれた「かすかなささやき」の手がかり ―

    東北大学

    2026/06

    Type: Internet

  5. 「超新星背景ニュートリノ」の兆候を初確認 スーパーカミオカンデで

    日本経済新聞

    2026/06

    Type: Newspaper, magazine

  6. 超新星爆発のニュートリノ、初めて複数を確認か 2代目カミオカンデ

    朝日新聞

    2026/06

    Type: Newspaper, magazine

  7. スーパーカミオカンデが超新星背景ニュートリノの兆候を捉える― 宇宙の歴史に刻まれた「かすかなささやき」の手がかり ―

    東京大学

    2026/06

    Type: Internet

  8. ICEHAPインタビュー

    千葉大学

    2022/05

    Type: Internet

  9. Interpreting The Relics of Stellar Burials

    astrobites

    2022/04

    Type: Internet

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