Most cited MAGIC and KASCADE research


 

KASCADE measurements of energy spectra for elemental groups of cosmic rays: Results and open problems

Authors

Tea Antoni, WD Apel, AF Badea, K Bekk, A Bercuci, J Blümer, H Bozdog, IM Brancus, A Chilingarian, K Daumiller, P Doll, R Engel, J Engler, F Feßler, HJ Gils, R Glasstetter, A Haungs, D Heck, JR Hörandel, K-H Kampert, HO Klages, G Maier, HJ Mathes, HJ Mayer, J Milke, M Müller, R Obenland, J Oehlschläger, S Ostapchenko, M Petcu, H Rebel, A Risse, M Risse, M Roth, G Schatz, H Schieler, J Scholz, T Thouw, Holger Ulrich, J Van Buren, A Vardanyan, A Weindl, J Wochele, J Zabierowski

Publication date

2005/09/01

Journal

Astroparticle physics

Volume

24

Issue

1-2

Pages

1-25

Publisher

North-Holland

Description

A composition analysis of KASCADE air shower data is performed by means of unfolding the two-dimensional frequency spectrum of electron and muon numbers. Aim of the analysis is the determination of energy spectra for elemental groups representing the chemical composition of primary cosmic rays. Since such an analysis depends crucially on simulations of air showers the two different hadronic interaction models QGSJet and SIBYLL are used for their generation. The resulting primary energy spectra show that the knee in the all particle spectrum is due to a steepening of the spectra of light elements but, also, that neither of the two simulation sets is able to describe the measured data consistently over the whole energy range with discrepancies appearing in different energy regions...Read more

Total citations

Cited by 828

The cosmic-ray experiment KASCADE

T. Antoni, W.D.  Apel, F. Badea, K. Bekk, A. Bercuci,  H. Blümer, H. Bozdog, I.M. Brancus, C. Büttner, A. Chilingarian

Publication date

2003/11/11

Publication 

Nuclear Instruments and Methods in Physics Research Section A: accelerators, spectrometers, detectors and associated equipment

Volume

513

Issue

3

Pages

490-510

Publisher

North-Holland

Description

KASCADE has been designed to measure air showers of primary cosmic-ray energies in the PeV region and to investigate the knee phenomenon in the all-particle energy spectrum. Several observations are measured simultaneously for each event by different detector systems. The experiment started to take data in 1996 and has been completed and extended since then. The individual detector systems and their performances are described. Also, the experience in long-term operation of the experiment and the interplay between different components is outlined....

Cited by 578

 

Methods for multidimensional event classification: a case study using images from a Cherenkov gamma-ray telescope

Authors

R.K. Bock, A. Chilingarian, M. Gaug, F. Hakl, Th. Hengstebeck, M. Jiřina, J. Klaschka, E. Kotrč, P. Savický, S. Towers, A Vaiciulis, W Wittek

Publication date

2004/1/11

Journal

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

Volume

516

Issue

2-3

Pages

511-528

Publisher

North-Holland

Description

We present results from a case study comparing different multivariate classification methods. The input is a set of Monte Carlo data, generated and approximately triggered and pre-processed for an imaging gamma-ray Cherenkov telescope. Such data belong to two classes, originating either from incident gamma rays or caused by hadronic showers. There is only a weak discrimination between signal (gamma) and background (hadrons), making the data an excellent proving ground for classification techniques.

The data and methods are described, and a comparison of the results is made. Several methods give results comparable in quality within small fluctuations, suggesting that they perform at or close to the Bayesian limit of achievable separation. Other methods give clearly inferior or inconclusive results. Some problems that this study can not address are also discussed.

Total citations

Cited by 316

 

Probing quantum gravity using photons from a flare of the active galactic nucleus Markarian 501 observed by the MAGIC telescope

Authors

J.Albert, E.Aliu, H.Anderhub, L.A.Antonelli, P.Antoranz, M.Backes, C.Baixeras, J.A.Barrio, H.Bartko, D.Bastieri, J.K.Becker, W.Bednarek, K.Berger, E.Bernardini, C.Bigongiari, A.Biland, R.K.Bockh…E.K.G.Sarkisyan 

Publication date

2008/16/10

Journal

Physics Letters B

Volume

668

Issue

4

Pages

253-257

Publisher

North-Holland

Description

We analyze the timing of photons observed by the MAGIC telescope during a flare of the active galactic nucleus Mkn 501 for a possible correlation with energy, as suggested by some models of quantum gravity (QG), which predict a vacuum refractive index...

Total citations

Cited by 306