TY - JOUR AU - Aab, A. AU - Bueno Villar, Antonio AU - Carceller López, Juan Miguel AU - Pierre Auger Collaboration PY - 2021 UR - http://hdl.handle.net/10481/69265 AB - We present the first measurement of the fluctuations in the number of muons in extensive air showers produced by ultrahigh energy cosmic rays. We find that the measured fluctuations are in good agreement with predictions from air shower simulations.... LA - eng PB - American Physical Society TI - Measurement of the Fluctuations in the Number of Muons in Extensive Air Showers with the Pierre Auger Observatory DO - 10.1103/PhysRevLett.126.152002 ER -