TY - GEN AU - Aab, A. AU - Bueno Villar, Antonio AU - Pierre Auger Collaboration PY - 2020 UR - http://hdl.handle.net/10481/64323 AB - The hybrid design of the Pierre Auger Observatory allows for the measurement of the properties of extensive air showers initiated by ultra-high energy cosmic rays with unprecedented precision. By using an array of prototype underground muon detectors,... LA - eng PB - Springer Nature TI - Direct measurement of the muonic content of extensive air showers between 2 × 1017 and 2 × 1018 eV at the Pierre Auger Observatory DO - 10.1140/epjc/s10052-020-8055-y ER -