Status of the ALPACA air shower array to explore sub-PeV gamma-ray sky in the southern hemisphere

T. Sako; M. Anzorena; D. Blanco; E. de la Fuente; K. Goto; Y. Hayashi; K. Hibino; N. Hotta; G. Imaizumi; A. Jimenez-Meza; Y. Katayose; C. Kato; S. Kato; T. Kawashima; K. Kawata; T. Koi; H. Kojima; T. Makishima; Y. Masuda; S. Matsuhashi; M. Matsumoto; R. Mayta; P. Miranda; A. Mizuno; K. Munakata; Y. Nakamura; C. Nina; M. Nishizawa; Y. Noguchi; S. Ogio; M. Ohnishi; S. Okukawa; A. Oshima; M. Raljevic; H. Rivera; T. Saito; T. K. Sako; J. Salinas; T. Shibasaki; S. Shibata; A. Shiomi; M. Subieta; F. Sugimoto; N. Tajima; W. Takano; M. Takita; Y. Tameda; K. Tanaka; R. Ticona; I. Toledano-Juarez; H. Tsuchiya; Y. Tsunesada; S. Udo; R. Usui; R. I. Winkelmann; G. Yamagishi; K. Yamazaki; Y. Yokoe

Status of the ALPACA air shower array to explore sub-PeV gamma-ray sky in the southern hemisphere

T. Sako, M. Anzorena, D. Blanco, E. de la Fuente, K. Goto, Y. Hayashi, K. Hibino, N. Hotta, G. Imaizumi, A. Jimenez-Meza, Y. Katayose, C. Kato, S. Kato, T. Kawashima, K. Kawata, T. Koi, H. Kojima, T. Makishima, Y. Masuda, S. MatsuhashiM. Matsumoto, R. Mayta, P. Miranda, A. Mizuno, K. Munakata, Y. Nakamura, C. Nina, M. Nishizawa, Y. Noguchi, S. Ogio, M. Ohnishi, S. Okukawa, A. Oshima, M. Raljevic, H. Rivera, T. Saito, T. K. Sako, J. Salinas, T. Shibasaki, S. Shibata, A. Shiomi, M. Subieta, F. Sugimoto, N. Tajima, W. Takano, M. Takita, Y. Tameda, K. Tanaka, R. Ticona, I. Toledano-Juarez, H. Tsuchiya, Y. Tsunesada, S. Udo, R. Usui, R. I. Winkelmann, G. Yamagishi, K. Yamazaki, Y. Yokoe

Research output: Contribution to journal › Conference article › peer-review

Abstract

To unveil the origin of galactic PeV cosmic rays, observation of sub-PeV gamma rays is crucial. Sub-PeV gamma-ray astronomy is established in the northern hemisphere since the discovery of the Crab nebula above 100 TeV by the TibetASγ collaboration in 2019. ALPACA is a new air shower experiment under construction in Bolivia to explore the sub-PeV gamma-ray sky in the southern hemisphere for the first time. The ALPACA array consists of 401 scintillation counters covering 82,800 m² and underground muon detectors (MDs) covering 3,600 m² and will start operation in 2025. Prior to the full ALPACA, a prototype array ALPAQUITA with 97 scintillation counters is operating since 2022. The first 900 m² MD will be constructed soon. In this contribution, we present the performance of the ALPAQUITA including the detection of the moon's shadow by charged cosmic rays. The plan of the first MD construction and the completion of the full ALPACA array are also presented.

Original language	English
Article number	659
Journal	Proceedings of Science
Volume	476
State	Published - 29 Apr 2025
Event	42nd International Conference on High Energy Physics, ICHEP 2024 - Prague, Czech Republic Duration: 18 Jul 2024 → 24 Jul 2024

Bibliographical note

Publisher Copyright:
© Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0).

Cite this

Sako, T., Anzorena, M., Blanco, D., de la Fuente, E., Goto, K., Hayashi, Y., Hibino, K., Hotta, N., Imaizumi, G., Jimenez-Meza, A., Katayose, Y., Kato, C., Kato, S., Kawashima, T., Kawata, K., Koi, T., Kojima, H., Makishima, T., Masuda, Y., ... Yokoe, Y. (2025). Status of the ALPACA air shower array to explore sub-PeV gamma-ray sky in the southern hemisphere. Proceedings of Science, 476, Article 659.

@article{bf3670f1fbe94616bc43569a817626ac,

title = "Status of the ALPACA air shower array to explore sub-PeV gamma-ray sky in the southern hemisphere",

abstract = "To unveil the origin of galactic PeV cosmic rays, observation of sub-PeV gamma rays is crucial. Sub-PeV gamma-ray astronomy is established in the northern hemisphere since the discovery of the Crab nebula above 100 TeV by the TibetASγ collaboration in 2019. ALPACA is a new air shower experiment under construction in Bolivia to explore the sub-PeV gamma-ray sky in the southern hemisphere for the first time. The ALPACA array consists of 401 scintillation counters covering 82,800 m2 and underground muon detectors (MDs) covering 3,600 m2 and will start operation in 2025. Prior to the full ALPACA, a prototype array ALPAQUITA with 97 scintillation counters is operating since 2022. The first 900 m2 MD will be constructed soon. In this contribution, we present the performance of the ALPAQUITA including the detection of the moon's shadow by charged cosmic rays. The plan of the first MD construction and the completion of the full ALPACA array are also presented.",

author = "T. Sako and M. Anzorena and D. Blanco and {de la Fuente}, E. and K. Goto and Y. Hayashi and K. Hibino and N. Hotta and G. Imaizumi and A. Jimenez-Meza and Y. Katayose and C. Kato and S. Kato and T. Kawashima and K. Kawata and T. Koi and H. Kojima and T. Makishima and Y. Masuda and S. Matsuhashi and M. Matsumoto and R. Mayta and P. Miranda and A. Mizuno and K. Munakata and Y. Nakamura and C. Nina and M. Nishizawa and Y. Noguchi and S. Ogio and M. Ohnishi and S. Okukawa and A. Oshima and M. Raljevic and H. Rivera and T. Saito and Sako, {T. K.} and J. Salinas and T. Shibasaki and S. Shibata and A. Shiomi and M. Subieta and F. Sugimoto and N. Tajima and W. Takano and M. Takita and Y. Tameda and K. Tanaka and R. Ticona and I. Toledano-Juarez and H. Tsuchiya and Y. Tsunesada and S. Udo and R. Usui and Winkelmann, {R. I.} and G. Yamagishi and K. Yamazaki and Y. Yokoe",

note = "Publisher Copyright: {\textcopyright} Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0).; 42nd International Conference on High Energy Physics, ICHEP 2024 ; Conference date: 18-07-2024 Through 24-07-2024",

year = "2025",

month = apr,

day = "29",

language = "Ingl{\'e}s",

volume = "476",

journal = "Proceedings of Science",

issn = "1824-8039",

publisher = "Sissa Medialab Srl",

}

Sako, T, Anzorena, M, Blanco, D, de la Fuente, E, Goto, K, Hayashi, Y, Hibino, K, Hotta, N, Imaizumi, G, Jimenez-Meza, A, Katayose, Y, Kato, C, Kato, S, Kawashima, T, Kawata, K, Koi, T, Kojima, H, Makishima, T, Masuda, Y, Matsuhashi, S, Matsumoto, M, Mayta, R, Miranda, P, Mizuno, A, Munakata, K, Nakamura, Y, Nina, C, Nishizawa, M, Noguchi, Y, Ogio, S, Ohnishi, M, Okukawa, S, Oshima, A, Raljevic, M, Rivera, H, Saito, T, Sako, TK, Salinas, J, Shibasaki, T, Shibata, S, Shiomi, A, Subieta, M, Sugimoto, F, Tajima, N, Takano, W, Takita, M, Tameda, Y, Tanaka, K, Ticona, R, Toledano-Juarez, I, Tsuchiya, H, Tsunesada, Y, Udo, S, Usui, R, Winkelmann, RI, Yamagishi, G, Yamazaki, K & Yokoe, Y 2025, 'Status of the ALPACA air shower array to explore sub-PeV gamma-ray sky in the southern hemisphere', Proceedings of Science, vol. 476, 659.

TY - JOUR

T1 - Status of the ALPACA air shower array to explore sub-PeV gamma-ray sky in the southern hemisphere

AU - Sako, T.

AU - Anzorena, M.

AU - Blanco, D.

AU - de la Fuente, E.

AU - Goto, K.

AU - Hayashi, Y.

AU - Hibino, K.

AU - Hotta, N.

AU - Imaizumi, G.

AU - Jimenez-Meza, A.

AU - Katayose, Y.

AU - Kato, C.

AU - Kato, S.

AU - Kawashima, T.

AU - Kawata, K.

AU - Koi, T.

AU - Kojima, H.

AU - Makishima, T.

AU - Masuda, Y.

AU - Matsuhashi, S.

AU - Matsumoto, M.

AU - Mayta, R.

AU - Miranda, P.

AU - Mizuno, A.

AU - Munakata, K.

AU - Nakamura, Y.

AU - Nina, C.

AU - Nishizawa, M.

AU - Noguchi, Y.

AU - Ogio, S.

AU - Ohnishi, M.

AU - Okukawa, S.

AU - Oshima, A.

AU - Raljevic, M.

AU - Rivera, H.

AU - Saito, T.

AU - Sako, T. K.

AU - Salinas, J.

AU - Shibasaki, T.

AU - Shibata, S.

AU - Shiomi, A.

AU - Subieta, M.

AU - Sugimoto, F.

AU - Tajima, N.

AU - Takano, W.

AU - Takita, M.

AU - Tameda, Y.

AU - Tanaka, K.

AU - Ticona, R.

AU - Toledano-Juarez, I.

AU - Tsuchiya, H.

AU - Tsunesada, Y.

AU - Udo, S.

AU - Usui, R.

AU - Winkelmann, R. I.

AU - Yamagishi, G.

AU - Yamazaki, K.

AU - Yokoe, Y.

N1 - Publisher Copyright: © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0).

PY - 2025/4/29

Y1 - 2025/4/29

N2 - To unveil the origin of galactic PeV cosmic rays, observation of sub-PeV gamma rays is crucial. Sub-PeV gamma-ray astronomy is established in the northern hemisphere since the discovery of the Crab nebula above 100 TeV by the TibetASγ collaboration in 2019. ALPACA is a new air shower experiment under construction in Bolivia to explore the sub-PeV gamma-ray sky in the southern hemisphere for the first time. The ALPACA array consists of 401 scintillation counters covering 82,800 m2 and underground muon detectors (MDs) covering 3,600 m2 and will start operation in 2025. Prior to the full ALPACA, a prototype array ALPAQUITA with 97 scintillation counters is operating since 2022. The first 900 m2 MD will be constructed soon. In this contribution, we present the performance of the ALPAQUITA including the detection of the moon's shadow by charged cosmic rays. The plan of the first MD construction and the completion of the full ALPACA array are also presented.

AB - To unveil the origin of galactic PeV cosmic rays, observation of sub-PeV gamma rays is crucial. Sub-PeV gamma-ray astronomy is established in the northern hemisphere since the discovery of the Crab nebula above 100 TeV by the TibetASγ collaboration in 2019. ALPACA is a new air shower experiment under construction in Bolivia to explore the sub-PeV gamma-ray sky in the southern hemisphere for the first time. The ALPACA array consists of 401 scintillation counters covering 82,800 m2 and underground muon detectors (MDs) covering 3,600 m2 and will start operation in 2025. Prior to the full ALPACA, a prototype array ALPAQUITA with 97 scintillation counters is operating since 2022. The first 900 m2 MD will be constructed soon. In this contribution, we present the performance of the ALPAQUITA including the detection of the moon's shadow by charged cosmic rays. The plan of the first MD construction and the completion of the full ALPACA array are also presented.

UR - http://www.scopus.com/inward/record.url?scp=105004799968&partnerID=8YFLogxK

M3 - Artículo de la conferencia

AN - SCOPUS:105004799968

SN - 1824-8039

VL - 476

JO - Proceedings of Science

JF - Proceedings of Science

M1 - 659

T2 - 42nd International Conference on High Energy Physics, ICHEP 2024

Y2 - 18 July 2024 through 24 July 2024

ER -