Oct 8 – 12, 2018
Ecole Supérieure de Chimie, Paris
Europe/Paris timezone

Auger-TA energy spectrum working group report

Oct 8, 2018, 3:40 PM
Friedel Amphitheater (Ecole Supérieure de Chimie, Paris)

Friedel Amphitheater

Ecole Supérieure de Chimie, Paris

Chimie ParisTech École Nationale Supérieure de Chimie de Paris 11, rue Pierre et Marie Curie 75231 PARIS Cedex 05
INVITED Sessions


Dmitri Ivanov (University of Utah)


The energy spectrum of ultra-high energy cosmic rays is the most emblematic observable for describing these particles. Beyond a few tens of EeV, the Pierre Auger Observatory and the Telescope Array, currently being exploited, provide the largest exposures ever accumulated in the Northern and the Southern hemispheres to measure independently a suppression of the intensity, in a complementary way in terms of the coverage of the sky. However, the comparison of the spectra shows differences that are not reducible to an overall uncertainty on the calibration of the energy scale used to reconstruct the extensive air showers. In line with the previous editions of the UHECR workshops, a working group common to both experiments examined these differences by focusing this time on quantification of these differences in the region of the sky commonly observed, where the spectra should be in agreement within uncertainties when directional-exposure effects are accounting for. These differences are compared with the systematic uncertainties of each experiment. We have also revisited the methods of determining cosmic ray energies and deriving the energy spectrum. We present the SD spectrum from energy calibration based on the constant intensity cut (CIC) method, SD spectrum from the Monte-Carlo based attenuation correction, and the hybrid spectrum, where the energies are determined from the longitudinal profile seen by the fluorescence detector.

Primary authors

Tareq AbuZayyad Olivier Deligny Dr Daisuke Ikeda (Earthquake Research Institute,The University of Tokyo) Dmitri Ivanov (University of Utah) Isabelle Lhenry-Yvon (IPN Orsay) Ioana Maris (Universitaet und Forschungszentrum Karlsruhe) Ms Mockler Daniela (Karlsruhe Institute of Technology, Institut für Kernphysik, Karlsruhe, Germany) Toshiyuki Nonaka (University of Tokyo) Dr Markus Roth (Karlsruhe Institute of Technology, Institut für Kernphysik, Karlsruhe, Germany) Dr Francesco Salamida (Universit'a dell'Aquila, L'Aquila, Italy) Prof. Gordon Thomson (University of Utah) Prof. Yoshiki Tsunesada (Osaka City University) Dr Ines Valino (Universidad de Santiago de Compostela, Santiago de Compostela, Spain) Valerio Verzi (INFN Roma "Tor Vergata")

Presentation materials