# Ultra High Energy Cosmic Rays 2018

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

## Data-driven model of the cosmic-ray flux and mass composition over all energies

Oct 8, 2018, 5:25 PM
20m
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
ORAL

### Speaker

Hans Dembinski (Max Planck Institute for Nuclear Physics, Heidelberg)

### Description

We present a parametrisation of the cosmic-ray flux and its mass composition over an energy range from 1 GeV to $10^{11}$ GeV, which can be used for theoretical calculations. The parametrisation provides a summary of the experimental state-of-the-art for individual elements from proton to nickel. We seamlessly combine measurements of the flux of individual elements from high-precision satellites and balloon experiments with indirect measurements of mass groups from the leading air shower experiments. We propagate both statistical and systematic uncertainties with correlations, and obtain a large flux covariance matrix as a result which can be further propagated. Variations in the energy scales of individual experiments are taken into account with nuisance parameters. We obtain a unified energy scale and adjustment factors for the energy scales of the participating experiments. Our fit has a reduced chi2 value of 1, showing that the data sets are in good agreement, if systematic uncertainties are taken into account.

### Primary authors

Hans Dembinski (Max Planck Institute for Nuclear Physics, Heidelberg) Thomas Gaisser (University of Delaware)