Würzburg 2018 – scientific programme
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T: Fachverband Teilchenphysik
T 7: Kosmische Strahlung I
T 7.2: Talk
Monday, March 19, 2018, 16:20–16:35, Philo-HS7
Derivation of the longitudinal profile of extensive air showers generated by cosmic rays — •Isabel Astrid Goos1 and Xavier Bertou2 for the Pierre Auger collaboration — 1Universidad Nacional de San Martín, Buenos Aires, Argentinien — 2CONICET, San Carlos de Bariloche, Argentinien
The present work focuses on extended air showers generated by high energy cosmic rays. The concept of air shower universality states that all the information about the primary particle can in principle be recovered from the measurement of the observables Xmax and Nµ. Both observables have a common origin: the production of π0 and π+/−, which are produced collectively along the shower axis. The aim is to understand the relationship between these two observables in order to be able to extract information about the development of the hadronic core of the shower.
The pion distribution varies heavily from shower to shower. Thus the first step is to understand the effect of different pion distributions on the values of Xmax and Nµ. In order to do that our first approach was to analyze sets of Monte Carlo simulations of extensive air showers carried out with CONEX where all secondaries of each interaction can be stored. The procedure used was to add up all the electromagnetic subcascades generated by the neutral pions and then compare the resulting longitudinal profile with the real one corresponding to that shower. This reconstruction adjusts very well the electromagnetic longitudinal profile, even so for ultra-high-energy cosmic rays.