1091.
Extension of the measurement of the proton-air cross section with the Pierre Auger Observatory
Dr
Ralf Matthias Ulrich
(KIT - Karlsruhe Institute of Technology (DE))
03/08/2015, 14:00
CR-EX
Oral contribution
With hybrid data of the Pierre Auger Observatory it is possible to measure the cross section of proton-air collisions at energies far beyond the reach of the LHC. Since the first measurement by the Pierre Auger Collaboration the event statistics has increased significantly. The proton-air cross section is now estimated in the two energy intervals in $\lg(E/\mathrm{eV})$ from 17.8 to 18.0 and...
Dr
Rasha Abbasi
(University of Utah)
03/08/2015, 14:15
CR-EX
Oral contribution
In this work we report on the measurement of the proton-air inelastic cross section $\sigma^{\rm inel}_{\rm p-air}$ using data collected by the Telescope Array (TA) detector. Based on the measurement of $\sigma^{\rm inel}_{\rm p-air}$, the proton-proton cross section $\sigma_{\rm p-p}$ is subsequently inferred using the Glauber Formalism and the QCD-inspired fit of Block, Halzen and Stanev, at...
Dr
Laura Collica
(INFN Torino)
03/08/2015, 14:30
CR-EX
Oral contribution
The muon content of extensive air showers is an observable sensitive to the primary composition and to the hadronic interaction properties. We present here different methods which allow us to estimate the muon number at the ground level and the muon production depth by exploiting the measurement of the longitudinal, lateral and temporal distribution of particles in air showers recorded at the...
Colin Baus
(KIT - Karlsruhe Institute of Technology (DE))
03/08/2015, 14:45
CR-EX
Oral contribution
The complexity of the development of extensive air showers makes it extremely difficult to study the nature and the sources of cosmic rays at ultra-high energies. The largest uncertainties are related to the modelling of hadronic interactions in the air shower cascade. The sensitivity to the theoretical description is maximised when measurements in the forward phase-space at accelerators are...
Juan Carlos Arteaga-Velazquez
(Universidad Michoacana)
03/08/2015, 15:00
CR-EX
Oral contribution
Preliminary analyses of air-shower data from the KASCADE-Grande observatory have pointed out a possible discrepancy between the predicted and the measured values of the attenuation length of muons
with energy threshold of 230 MeV at ground level in air showers. In particular, the analyses suggest that the measured muon attenuation length, as reconstructed with the constant intensity cut...
Prof.
Ding Chen
(National Astronomical Observatories, CAS)
03/08/2015, 15:15
CR-EX
Oral contribution
A hybrid experiment has been started by the Tibet ASγcollaboration in Tibet, China, since May 2009. It consists of a burst-detector-grid (YAC : Yangbajing Air- shower Core-array) and the Tibet-III AS array. The Tibet-III array is used to measure the total energy and the arrival direction of air-showers, and YAC-I can observe high-energy shower particles in air-shower cores. By comparing the MC...
Dr
Hans Peter Dembinski
(Bartol Institute, Dept of Physics and Astronomy, University of Delaware),
Javier Gonzalez
(Bartol Research Institute, Univ Delaware)
03/08/2015, 15:30
CR-EX
Oral contribution
IceTop, the surface component of the IceCube detector, has been used to measure the energy spectrum of cosmic rays from 1.6 PeV to 1.3 EeV. It was recently shown that the recorded data can also be used to measure the average density of GeV muons in the shower front at large radial distances (> 300 m) from the shower axis. The analysis is based on fitting the single muon peak in charge...
Markus Roth
(KIT)
03/08/2015, 15:45
CR-EX
Oral contribution
Extensive air showers are traditionally described with phenomenological models - often called Lateral Distribution Functions (LDFs) - of the density of particles at the ground and derived quantities. The concept of air shower universality aims at a deeper understanding of the shower development in the atmosphere by taking into account physical properties of different types of secondary...
