Michael Unger
(NYU & KIT)
31/07/2015, 14:00
CR-EX
Oral contribution
The atmospheric depth $X_\mathrm{max}$ at which the particle number of an air shower
reaches its maximum is a good indicator for the mass of the
primary particle. We present a comparison of the energy evolution
of the mean of $X_\mathrm{max}$ as measured by the Telescope Array and Pierre
Auger Collaborations. After accounting for the different resolutions,
acceptances and analysis...
Dr
Alexey Yushkov
(University of Siegen)
31/07/2015, 14:15
CR-EX
Oral contribution
We report for the first time on the measurement of the correlation between the depth of shower maximum and the signal in water-Cherenkov stations for events reconstructed by both the fluorescence and surface detectors of the Pierre Auger Observatory. Such a correlated measurement is a unique feature of a hybrid air shower observatory and allows us to determine the purity of the cosmic-ray...
John Belz
(University of Utah)
31/07/2015, 14:30
CR-EX
Oral contribution
We study the chemical composition of ultrahigh energy cosmic rays primarily using the Xmax technique. The reconstruction techniques use events either seen by two of the TA fluorescence detectors (stereo mode), or by one fluorescence detector, and one fluorescence detector and the TA surface detector (hybrid mode). Each technique has its own acceptance imprinted on the data. We compare the...
Dr
Alessio Porcelli
(Universite de Geneve (CH))
31/07/2015, 14:45
CR-EX
Oral contribution
For the first time the Pierre Auger Collaboration presents $\langle X_\mathrm{max}\rangle$ and $\sigma(X_\mathrm{max})$ measurements covering nearly three decades of energy. In this analysis we include new $X_\mathrm{max}$ data obtained with the Pierre Auger High Elevation Fluorescence Telescopes (HEAT) enhancement. The HEAT telescopes cover a field of view ranging from $30^\circ$ to...
Grigory Rubtsov
(INR RAS)
31/07/2015, 15:00
CR-EX
Oral contribution
We report on a search for ultra-high-energy photons with a multivariate analysis technique based on the properties of shower fronts of events observed by the Telescope Array surface detector. We present the point source photon flux upper limits for all directions in the Northern hemisphere. The revised constraints on the diffuse flux of the primary photons with energies greater than 10^19 eV...
Stijn Buitink
(Vrije Universiteit Brussel (VUB))
31/07/2015, 15:15
CR-EX
Oral contribution
The LOFAR radio telescope measures the radio emission from air showers with unprecedented precision. In the dense core individual air showers are detected by hundreds of dipole antennas. The complicated radio pattern on the ground is accurately reproduced by modern radio simulation codes and contains information about the longitudinal shower development. With a hybrid reconstruction technique,...
