S. Valchierotti

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The nature of ultrahigh-energy cosmic rays (UHECRs) at energies >10(20) eV remains a mystery. They are likely to be of extragalactic origin, but should be absorbed within approximately 50 Mpc through interactions with the cosmic microwave background. As there are no sufficiently powerful accelerators within this distance from the Galaxy, explanations for(More)
Radio pulses emitted in the atmosphere during the air shower development of high-energy primary cosmic rays were measured during the late 1960ies in the frequency range from 2 MHz to 520 MHz. Mainly due to difficulties with radio interference these measurements ceased in the late 1970ies. LOFAR (Low Frequency Array) is a new digital radio interferometer(More)
Recent results from the multi-detector set-up KASCADE on measurements of cosmic rays in the energy range of the so called ”first” knee (at ≈ 3PeV) indicate a distinct knee in the energy spectra of light primary cosmic rays and an increasing dominance of heavy ones towards higher energies. This leads to the expectation of knee-like features of the heavy(More)
The primary cosmic ray (CR) proton, helium and CNO fluxes in the energy range 80–300 TeV are studied at the National Gran Sasso Laboratories by means of EAS-TOP (Campo Imperatore, 2005 m a.s.l.) and MACRO (deep underground, 3100 m w.e., the surface energy threshold for a muon reaching the detector being E l 1:3 TeV). The measurement is based on: (a) the(More)
We present the design and first test results of a new flash analog-to-digital-converters (FADCs)-based data acquisition (DAQ) system for the Grande array of the KASCADE-Grande experiment. The original KASCADE experiment at the Forschungszentrum Karlsruhe, Germany, has been extended by 37 detector stations of the former EAS-TOP experiment (Grande array) to(More)
K.-H. Kampert, T. Antoni, W.D. Apel, F. Badea, K. Bekk , A. Bercuci M. Bertaina, H. Blümer, H. Bozdog, I.M. Brancus, M. Brüggemann P. Buchholz, C. Büttner, A. Chiavassa, A. Chilingarian, K. Daumiller P. Doll, R. Engel, J. Engler, F. Fessler , P.L. Ghia, H.J. Gils R. Glasstetter, A. Haungs, D. Heck, J.R. Hörandel , H.O. Klages Y. Kolotaev, G. Maier, H.J.(More)
KASCADE-Grande is the extension of the multi-detector setup KASCADE to cover a primary cosmic ray energy range from 100 TeV to 1 EeV. The enlarged EAS experiment provides comprehensive observations of cosmic rays in the energy region around the knee. Grande is an array of 700 x 700 m 2 equipped with 37 plastic scintillator stations sensitive to measure(More)
M. Bertaina, H. Blümer, H. Bozdog, I.M. Brancus, M. Brüggemann, P. Buchholz, C. Büttner, A. Chiavassa, A. Chilingarian, K. Daumiller, P. Doll, R. Engel, J. Engler, F. Fessler , P.L. Ghia, H.J. Gils, R. Glasstetter, A. Haungs, D. Heck, J.R. Hörandel , H.O. Klages, Y. Kolotaev, G. Maier, H.J. Mathes , H.J. Mayer , J. Milke , C. Morello, M. Müller , G.(More)
on air shower observables J.R. Hörandela∗, T. Antoni, W.D. Apel, F. Badeab†, K. Bekk, A. Bercuci, M. Bertaina, J. Blümer H. Bozdog, I.M. Brancus, M. Brüggemann, P. Buchholz, C. Büttner, A. Chiavassa, K. Daumiller, F. Di Pierro, P. Doll, R. Engel, J. Engler, F. Feßler, P.L. Ghia , H.J. Gils, R. Glasstetter, A. Haungs, D. Heck, K.-H. Kampert, H.O. Klages, Y.(More)
The amplitude and phase of the cosmic-ray anisotropy are well established experimentally between 1011 eV and 1014 eV. The study of their evolution in the energy region 1014–1016 eV can provide a significant tool for the understanding of the steepening (“knee”) of the primary spectrum. In this Letter, we extend the EAS-TOP measurement performed at E0 ≈ 1014(More)