Posted in astro-ph.HE · 2026-01-13 · M. Anzorena, E. de la Fuente, K. Fujita, R. Garcia, Y. Hayashi, K. Hibino, N. Hotta, G. Imaizumi, Y. Katayose, C. Kato, S. Kato, T. Kawashima, K. Kawata, M. Kobayashi, S. Kobayashi, T. Koi, H. Kojima, P. Miranda, S. Mitsuishi, A. Mizuno, K. Munakata, Y. Nakamura, M. Nishizawa, Y. Noguchi, S. Ogio, M. Ohishi, M. Ohnishi, A. Oshima, M. Raljevic, H. Rivera, T. Saito, T. Sako, T. K. Sako, S. Shibata, A. Shiomi, M. Subieta, F. Sugimoto, N. Tajima, W. Takano, Y. Takeyama, M. Takita, N. Tamaki, Y. Tameda, K. Tanaka, R. Ticona, H. Tsuchiya, Y. Tsunesada, S. Udo, G. Yamagishi, Y. Yamanaka, K. Yamazaki, Y. Yokoe
The Andes Large area PArticle detector for Cosmic ray and Astronomy (ALPACA) is a new air-shower array experiment under construction in the Bolivian Andes, and its prototype ALPAQUITA surface array has been operating since 2023 April. In addition to the traditional $\ge$3-hit or $\ge$4-hit coincidences to trigger recording air-shower...