Neural Networks for /hadron-separation with the Hegra Geiger Towers 1

Design and Performance of the Lead-concrete Geiger Tower Array within the Hegra Experiment

The HEGRA experiment is a hybrid installation characterized by four diierent types of detectors (scintillator counters, open Cerenkov counters, Cerenkov telescopes and Geiger towers) located within one detector array. The Geiger towers are built with the objective to measure the local energy deposition and to reconstruct and identify muon tracks. In addition each tower may serve as an independe...

Ja n 20 01 Particle Identification by Multifractal Parameters in γ - Astronomy with the HEGRA - Čerenkov - Telescopes HEGRA Collaboration

Čerenkov images of air showers can also be classified using multifractal and wavelet parameters, as compared to the conventional Hillas image parameters. This new technique was applied to the images recorded by the cameras of the stereoscopic imaging air Čerenkov-telescopes operated by the HEGRA collaboration. With respect to the identification of particles, the performance of multifractal and ...

An investigation of using hump in the Cherenkov photon lateral distribution for Gamma-Hadron separation

Simulation of gamma and hadron showers in the energy range 100GeV- 25TeV has been carried out. For a big ideal Cherenkov light array, characteristics of lateral distribution of Cherenkov photon density have been studied. Results from this ideal detector are compared with those simulated for a real TUNKA- like array to investigate experimental potential of using existence of a hump in lateral di...

Gamma / Hadron Separation with Neural Networks

Beacons at the Gamma Ray Horizon

Blazars with redshifts z ≤ 0.1 are likely candidates for detection at energies in the range 300 GeV – 50 TeV withČerenkov telescopes and scintillator arrays. We present γ-ray flux predictions for a sample of 15 nearby flat-spectrum radio sources fitting the proton blazar model of Mannheim (1993a) to their observed broad-band spectral energy distributions. At high energies, we use fluxes or flux...