We present a new method for probing the hadronic interaction models at ultrahigh energy and extracting details about mass composition. This is done using the time profiles of the signals recorded with the water- Cherenkov detectors of the Pierre Auger Observatory. The profiles arise from a mix of the muon and electromagnetic components of air showers. Using the risetimes of the recorded signals, we define a new parameter, which we use to compare our observations with predictions from simulations. We find, first, inconsistencies between our data and predictions over a greater energy range and with substantially more events than in previous studies. Second, by calibrating the new parameter with fluorescence measurements from observatio...
Extensive air showers are complex objects, resulting of billions of particle reactions initiated by ...
We report a first measurement for ultrahigh energy cosmic rays of the correlation between the depth ...
The hybrid design of the Pierre Auger Observatory allows for the measurement of the properties of ex...
We present a new method for probing the hadronic interaction models at ultrahigh energy and extracti...
Presently large systematic uncertainties remain in the description of hadronic interactions at ultra...
Several methods have been developed by the Pierre Auger Collaboration to estimate the muon content o...
The muon content of extensive air showers produced by ultra-high energy cosmic rays is an observable...
The characteristics of an extensive air shower derive from both the mass of the primary ultra-high-e...
With data on the depth of maximum Xmax collected during more than a decade of operation of the Pier...
Extensive air showers are complex objects, resulting of billions of particle reactions initiated by ...
We report a first measurement for ultrahigh energy cosmic rays of the correlation between the depth ...
The hybrid design of the Pierre Auger Observatory allows for the measurement of the properties of ex...
We present a new method for probing the hadronic interaction models at ultrahigh energy and extracti...
Presently large systematic uncertainties remain in the description of hadronic interactions at ultra...
Several methods have been developed by the Pierre Auger Collaboration to estimate the muon content o...
The muon content of extensive air showers produced by ultra-high energy cosmic rays is an observable...
The characteristics of an extensive air shower derive from both the mass of the primary ultra-high-e...
With data on the depth of maximum Xmax collected during more than a decade of operation of the Pier...
Extensive air showers are complex objects, resulting of billions of particle reactions initiated by ...
We report a first measurement for ultrahigh energy cosmic rays of the correlation between the depth ...
The hybrid design of the Pierre Auger Observatory allows for the measurement of the properties of ex...