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10 results on '"W. Hafemann"'

1. Test and analysis of hadronic interaction models with KASCADE event rates

Author

W. Hafemann, T. Antoni, J.R. Hörandel, J. Knapp, H. Bozdog, W.D. Apel, D. Martello, G. Schatz, E. Bollmann, H. J. Gils, Markus Roth, J. Milke, H. Ulrich, J. Engler, J. Wochele, J. Kempa, J.H. Weber, D. Heck, S. Zagromski, P. Matussek, A. Vardanyan, J. Oehlschläger, R. Haeusler, Ashot Chilingarian, J. Wentz, K. Bernlöhr, H.J. Mayer, F. Feßler, H.O. Klages, B. Vulpescu, J. Zabierowski, T. Thouw, M. Risse, P. Doll, H. Blümer, T. Wiegert, Hermann-Josef Mathes, R. Glasstetter, H. Rebel, Kai Daumiller, Karl-Heinz Kampert, M. Petcu, K. Bekk, T. Holst, F. Badea, C. Büttner, D. Mühlenberg, A. Haungs, I.M. Brancus, M., Risse, T., Antoni, W. D., Apel, F., Badea, K., Bekk, K., Bernlohr, H., Blumer, E., Bollmann, H., Bozdog, I. M., Brancu, C., Buttner, A., Chilingarian, K., Daumiller, P., Doll, J., Engler, F., Fessler, H. J., Gil, R., Glasstetter, R., Haeusler, W., Hafemann, A., Haung, D., Heck, J. R., Horandel, T., Holst, K. H., Kampert, J., Kempa, H. O., Klage, J., Knapp, Martello, Daniele, H. J., Mathe, P., Matussek, H. J., Mayer, J., Milke, D., Muhlenberg, J., Oehlschlager, M., Petcu, H., Rebel, M., Roth, G., Schatz, T., Thouw, H., Ulrich, A., Vardanyan, B., Vulpescu, J. H., Weber, J., Wentz, T., Wiegert, J., Wochele, J., Zabierowski, and S., Zagromski

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, KASCADE, biology, Hadron, High Energy Physics::Experiment, Venus, Elasticity (economics), biology.organism_classification, Atomic and Molecular Physics, and Optics, Hadron calorimeter
Abstract

Based on the KASCADE multi-detector system with its large hadron calorimeter and using the CORSIKA simulation program with the implemented high-energy hadronic interaction models QGSJET, VENUS, DPMJET, SIBYLL, and HDPM, a method for the test of models by comparing el ent rates is described. Preliminary results show differences of the model predictions both among each other and when confronted with measurements. The rates are strongly influenced by the inelastic cross sections and the elasticity, especially by the contribution of diffractive dissociation. The discrepancy to measurements at primary energies below similar or equal to 3 (.) 10(13) eV can be reduced by increasing the non-diffractive inelastic cross section.

Published
2001

2. A non-parametric approach to infer the energy spectrum and the mass composition of cosmic rays

Author

W. Hafemann, T. Antoni, H. J. Mathes, Gernot Maier, H. Blümer, T. Wiegert, K. H. Kampert, K. Bekk, Konrad Bernlöhr, Markus Roth, M. Risse, I.M. Brancus, J. Milke, P. Doll, J. Wentz, Kai Daumiller, G. Schatz, J. Engler, J. Scholz, A. Haungs, J. Oehlschläger, Ashot Chilingarian, J. Wochele, M. Petcu, T. Thouw, J. Knapp, J. Zabierowski, D. Heck, H. Rebel, T. Holst, H. Bozdog, H.J. Gils, F. Feßler, A. Vardanyan, H.O. Klages, H.J. Mayer, H. Ulrich, W. D. Apel, S. Zagromski, D. Mühlenberg, Jörg R. Hörandel, J. Kempa, E. Bollmann, F. Badea, Marcio Aparecido Muller, R. Haeusler, J.H. Weber, C. Büttner, B. Vulpescu, and R. Glasstetter

Subjects
Nuclear physics, Physics, Range (particle radiation), Muon, Air shower, KASCADE, Astrophysics::High Energy Astrophysical Phenomena, Hadron, Monte Carlo method, Astronomy and Astrophysics, Cosmic ray, Interaction model
Abstract

The experiment KASCADE observes simultaneously the electron–photon, muon, and hadron components of high-energy extensive air showers (EAS). The analysis of EAS observables for an estimate of energy and mass of the primary particle invokes extensive Monte Carlo simulations of the EAS development for preparing reference patterns. The present studies utilize the air shower simulation code corsika with the hadronic interaction models VENUS, QGSJet and Sibyll, including simulations of the detector response and efficiency. By applying non-parametric techniques the measured data have been analyzed in an event-by-event mode and the mass and energy of the EAS inducing particles are reconstructed. Special emphasis is given to methodical limitations and the dependence of the results on the hadronic interaction model used. The results obtained from KASCADE data reproduce the knee in the primary spectrum, but reveal a strong model dependence. Owing to the systematic uncertainties introduced by the hadronic interaction models no strong change of chemical composition can be claimed in the energy range around the knee.

Published
2002

3. Recent results of KASCADE phenomenology of extensive air showers

Author

W. Hafemann, T. Antoni, B. Vulpescu, J. Knapp, S. Zagromski, T. Thouw, Markus Roth, H. Bozdog, J. Wochele, J. Engler, T. Wiegert, R. Glasstetter, D. Heck, D. Mühlenberg, A. Vardanyan, D. Martello, E. Bollmann, J. Kempa, R. Haeusler, Hermann-Josef Mathes, M. Petcu, K. Bernlöhr, J.H. Weber, J.R. Hörandel, H. Ulrich, C. Büttner, Kai Daumiller, W.D. Apel, F. Badea, T. Holst, J. Wentz, J. Oehlschläger, H. Rebel, Karl-Heinz Kampert, M. Risse, A. Haungs, I.M. Brancus, K. Bekk, P. Matussek, J. Milke, H.J. Mayer, J. Zabierowski, F. Feßler, H. Blümer, H.O. Klages, G. Schatz, H. J. Gils, Ashot Chilingarian, and P. Doll

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Hadron, Astrophysics::Instrumentation and Methods for Astrophysics, Observable, Cosmic ray, Electron, Atomic and Molecular Physics, and Optics, Nuclear physics, Air shower, KASCADE, High Energy Physics::Experiment, Phenomenology (particle physics)
Abstract

KASCADE (KArlsruhe Shower Core and Array DEtector) is a multi-detector setup to observe the electromagnetic, muonic and hadronic air shower components simultaneously in the energy region around the “knee” of the primary spectrum. Its main aim is to determine energy spectrum and composition of hadrons in primary cosmic rays. This is attempted by registring a large number of observables for each EAS including measurements of electrons, muons and hadrons. This contribution gives a short description of the experiment and then presents some results on the lateral distributions of various particle types and on the spectrum of hadrons. The status of our analyses to determine mass composition is presented in an accompanying contribution by A. Haungs.

Published
2001

4. Towards the energy spectrum and composition of primary cosmic rays in the knee region: methods and results at KASCADE

Author

J. Wochele, D. Heck, J. Milke, J. Knapp, A. Vardanyan, A. Haungs, J. Wentz, H. Bozdog, B. Vulpescu, W.D. Apel, J.R. Hörandel, T. Thouw, J. Zabierowski, R. Glasstetter, W. Hafemann, T. Wiegert, Ashot Chilingarian, H. Ulrich, M. Petcu, T. Antoni, I.M. Brancus, Markus Roth, D. Martello, P. Matussek, E. Bollmann, J. Engler, H.J. Mayer, J. Kempa, R. Haeusler, J. Oehlschläger, K. Bernlöhr, C. Büttner, T. Holst, Hermann-Josef Mathes, D. Mühlenberg, Kai Daumiller, H. Blümer, S. Zagromski, F. Badea, H. Rebel, Karl-Heinz Kampert, M. Risse, P. Doll, H.O. Klages, F. Feßler, G. Schatz, H. J. Gils, K. Bekk, and J.H. Weber

Subjects
Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Hadron, Detector, Astrophysics::Instrumentation and Methods for Astrophysics, Cosmic ray, Astrophysics, Atomic and Molecular Physics, and Optics, Nuclear physics, Core (optical fiber), Air shower, KASCADE, Primary (astronomy), Energy spectrum, High Energy Physics::Experiment, human activities
Abstract

KASCADE (KArlsruhe Shower Core and Array DEtector) is a multi-detector setup to observe the electromagnetic, muonic and hadronic air shower components simultaneously at primary energies in the region of the “knee”. A large number of observables per single shower are registered. The main aims of the experiment are the determination of the primary energy spectrum around the “knee” and the energy variation of the chemical composition. The measurements reveal an increasing mean mass of the primary cosmic rays above the observed kink, and a sharper knee for the light primary component than for the all-particle spectrum, and the absence of a knee for the heavy component between 1 and 10 PeV.

Published
2001

5. Estimation of the chemical composition in the 'knee' region from the muon/electron ratio in EAS

Author

J.H. Weber, J. Engler, E. Bollmann, J.R. Hörandel, D. Miihlenberg, J. Milke, F. Fessler, R. Haeusler, H. Keim, K. Daumiller, H.J. Mayer, A. Haungs, H. Ulrich, A. Chilingarian, J. Zabierowski, J. Kempa, D. Heck, D. Wochele, F. Badea, H. Schieler, T. Holst, J. Wentz, I.M. Brâncu, J. Oehlschläger, T. Antoni, M. Petcu, H.J. Gils, J. Unger, W.D. Apel, K. Bekk, H.O. Klages, J. Knapp, T. Wiegert, F.K. Schmidt, P. Doll, K. Bernlöhr, T. Thouw, H. Leibrock, B. Vulpescu, R. Glasstetter, H. Rebel, M. Risse, S. Zagromski, J. Wochele, M. Roth, Tadeusz Wibig, G. Schatz, W. Hafemann, H. Bozdog, H.J. Mathes, and K.-H. Kampert

Subjects
Physics, Nuclear and High Energy Physics, Muon, biology, Astrophysics::High Energy Astrophysical Phenomena, Hadron, Interaction model, Venus, Electron, biology.organism_classification, Atomic and Molecular Physics, and Optics, Nuclear physics, Air shower, KASCADE, Particle
Abstract

New data on the muon/electron ratio derived from the KASCADE extensive air shower experiment are presented. This ratio is known to be the most sensitive parameter in the determination of the mass of the primary particle when using ground array data. The particle numbers are measured with the KASCADE array comprising 500 m 2 of e/γ- and 620 m 2 of μ - detectors. The primary mass is inferred on an event-by-event basis by comparing the experimental data to corresponding EAS simulations. We observe a change towards a heavier composition with increasing energy above the knee. The sensitivity of this result to the specific hadronic interaction model employed in the simulations (e.g. VENUS and QGSJET) is discussed.

Published
1999

6. Electron, muon, and hadron lateral distributions measured in air showers by the KASCADE experiment

Author

T Antoni, W.D Apel, F Badea, K Bekk, K Bernlöhr, H Blümer, E Bollmann, H Bozdog, I.M Brancus, A Chilingarian, K Daumiller, P Doll, J Engler, F Feßler, H.J Gils, R Glasstetter, R Haeusler, W Hafemann, A Haungs, D Heck, T Holst, J.R Hörandel, K.-H Kampert, J Kempa, H.O Klages, J Knapp, D Martello, H.J Mathes, H.J Mayer, J Milke, D Mühlenberg, J Oehlschläger, M Petcu, H Rebel, M Risse, M Roth, G Schatz, F.K Schmidt, T Thouw, H Ulrich, A Vardanyan, B Vulpescu, J.H Weber, J Wentz, T Wiegert, J Wochele, J Zabierowski, T., Antoni, W. D., Apel, F., Badea, K., Bekk, K., Bernlohr, H., Blumer, E., Bollmann, H., Bozdog, I. M., Brancu, A., Chilingarian, K., Daumiller, P., Doll, J., Engler, F., Fessler, H. J., Gil, R., Glasstetter, R., Haeusler, W., Hafemann, A., Haung, D., Heck, T., Holst, J. R., Horandel, K. H., Kampert, J., Kempa, H. O., Klage, J., Knapp, Martello, Daniele, H. J., Mathe, H. J., Mayer, J., Milke, D., Muhlenberg, J., Oehlschlager, M., Petcu, H., Rebel, M., Risse, M., Roth, G., Schatz, F. K., Schmidt, T., Thouw, H., Ulrich, A., Vardanyan, B., Vulpescu, J. H., Weber, J., Wentz, T., Wiegert, J., Wochele, and J., Zabierowski

Subjects
Physics, Range (particle radiation), Muon, Hadron, Astrophysics (astro-ph), Inner core, FOS: Physical sciences, Astronomy and Astrophysics, Electron, Astrophysics, Nuclear physics, KASCADE, Particle, High Energy Physics::Experiment, Zenith
Abstract

Measurements of electron, muon, and hadron lateral distributions of extensive air showers as recorded by the KASCADE experiment are presented. The data cover the energy range from about 5x10^14 eV up to almost 10^17 eV and extend from the inner core region to distances of 200 m. The electron and muon distributions are corrected for mutual contaminations by taking into account the detector properties in the experiment. All distributions are well described by NKG-functions. The scale radii describing the electron and hadron data best are approx. 30 m and 10 m, respectively. We discuss the correlation between scale radii and `age' parameter as well as their dependence on shower size, zenith angle, and particle energy threshold., Comment: 28 pages, 14 figures, Accepted for publication in Astroparticle Physics

Published
2001

7. Time structure of the extensive air shower muon component measured by the KASCADE experiment

Author

H.J. Gils, D. Mühlenberg, T. Thouw, A. Haungs, E. Bollmann, W. D. Apel, J. Oehlschläger, H. Blümer, R. Haeusler, J. Zabierowski, H. J. Mathes, H. Bozdog, A.F. Badea, J. Wochele, Jörg R. Hörandel, D. Martello, D. Heck, J. Milke, Ashot Chilingarian, J. Wentz, Fabian Schmidt, K. H. Kampert, J. Kempa, Markus Roth, K. Bekk, Konrad Bernlöhr, G. Schatz, J. Engler, H. Rebel, T. Holst, H.J. Mayer, W. Hafemann, J. Knapp, F. Feßler, T. Antoni, H. Ulrich, H.O. Klages, Kai Daumiller, M. Risse, A. Vardanyan, T. Wiegert, P. Doll, M. Petcu, B. Vulpescu, S. Zagromski, R. Glasstetter, J.H. Weber, I.M. Brancus, T., Antoni, W. D., Apel, A. F., Badea, K., Bekk, K., Bernlohr, H., Blumer, E., Bollmann, H., Bozdog, I. M., Brancu, A., Chilingarian, K., Daumiller, P., Doll, J., Engler, F., Fessler, H. J., Gil, R., Glasstetter, R., Haeusler, W., Hafemann, A., Haung, D., Heck, T., Holst, J. R., Horandel, K. H., Kampert, J., Kempa, H. O., Klage, J., Knapp, Martello, Daniele, H. J., Mathe, H. J., Mayer, J., Milke, D., Muhlenberg, J., Oehlschlager, M., Petcu, H., Rebel, M., Risse, M., Roth, G., Schatz, F. K., Schmidt, T., Thouw, H., Ulrich, A., Vardanyan, B., Vulpescu, J. H., Weber, J., Wentz, T., Wiegert, J., Wochele, J., Zabierowski, and S., Zagromski

Subjects
Physics, Muon, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Detector, Monte Carlo method, Astronomy and Astrophysics, Cosmic ray, Nuclear physics, Air shower, KASCADE, Quartile, Angle of incidence (optics), High Energy Physics::Experiment
Abstract

The temporal structure of the extensive air shower (EAS) muon component (E-thres = 2.4 GeV) is studied at sea level by measurements of the muon arrival time distributions using the muon detection facilities of the KASCADE central detector. Data have been analysed for EAS core distances up to 110 m for primary energies around the knee region. The time structure of the EAS muon component is represented by the distributions of the mean, median, first quartile and the third quartile of the muon arrival time distributions relative to the foremost muon. The EAS time profiles (variation with the distance from the EAS center) are studied along their dependencies on the angle of incidence and the energy-indicative muon number N-mu(tr). Effects of the fluctuation of the arrival time of the first registered muon are scrutinised and corrected. The experimental results are compared with EAS Monte Carlo (CORSIKA-GEANT) simulations, fully including the detector responses and illustrating the phenomenological features. The comparisons, though generally in fair global agreement, revealed that the simulations underestimate the shower thickness and show nearly no dependence on the mass composition if the time resolution of the apparatus is realistically taken into account. (C) 2001 Elsevier Science B.V. All rights reserved.

Published
2001

8. First results of the air shower experiment KASCADE

Author

A. Haungs, T. Antoni, W.D. Apel, F. Badea, K. Bekk, K. Bernlöhr, H. Blümer, E. Bollmann, H. Bozdog, I.M. Brancus, C. Büttner, A. Chilingarian, K. Daumiller, P. Doll, J. Engler, F. Feßler, H.J. Gils, R. Glasstetter, R. Haeusler, W. Hafemann, D. Heck, J.R. Hörandel, T. Holst, K.-H. Kampert, H. Keim, J. Kempa, H.O. Klages, J. Knapp, D. Martello, H.J. Mathes, P. Matussek, H.J. Mayer, J. Milke, D. Mühlenberg, J. Oehlschläger, M. Petcu, H. Rebel, M. Risse, M. Roth, G. Schatz, F.K. Schmidt, T. Thouw, H. Ulrich, A. Vardanyan, B. Vulpescu, J.H. Weber, J. Wentz, T. Wiegert, J. Wochelea, J. Zabierowski, S. Zagromski, A., Haung, T., Antoni, W. D., Apel, F., Badea, K., Bekk, K., Bernlohr, H., Blumer, E., Bollmann, H., Bozdog, I. M., Brancu, C., Buttner, A., Chilingarian, K., Daumiller, P., Doll, J., Engler, F., Fessler, H. J., Gil, R., Glasstetter, R., Haeusler, W., Hafemann, D., Heck, J. R., Horandel, T., Holst, K. H., Kampert, H., Keim, J., Kempa, H. O., Klage, J., Knapp, Martello, Daniele, H. J., Mathe, P., Matussek, H. J., Mayer, J., Milke, D., Muhlenberg, J., Oehlschlager, M., Petcu, H., Rebel, M., Risse, M., Roth, G., Schatz, F. K., Schmidt, T., Thouw, H., Ulrich, A., Vardanyan, B., Vulpescu, J. H., Weber, J., Wentz, T., Wiegert, J., Wochele, J., Zabierowski, and S., Zagromski

Subjects
Physics, Nuclear and High Energy Physics, Elemental composition, Range (particle radiation), Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), Detector, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, Cosmic ray, Astrophysics, Atomic and Molecular Physics, and Optics, Nuclear physics, Shower, Air shower, KASCADE, Energy spectrum
Abstract

The main goals of the KASCADE (KArlsruhe Shower Core and Array DEtector) experiment are the determination of the energy spectrum and elemental composition of the charged cosmic rays in the energy range around the knee at ca. 5 PeV. Due to the large number of measured observables per single shower a variety of different approaches are applied to the data, preferably on an event-by-event basis. First results are presented and the influence of the high-energy interaction models underlying the analyses is discussed., 3 pages, 3 figures included, to appear in the TAUP 99 Proceedings, Nucl. Phys. B (Proc. Suppl.), ed. by M. Froissart, J. Dumarchez and D. Vignaud

Published
2000

9. Search for high energy gamma rays with the KASCADE experiment

Author

E. Bollmann, J. Oehlschläger, T. Thouw, M. Petcu, R. Haeusler, J. Wentz, J. R. Hörandel, P. Matussek, J.H. Weber, H. Bozdog, K. Bernlöhr, W.D. Apel, Harsha Blumer, T. Holst, H.J. Mayer, A. Haungs, J. Zabierowski, B. Vulpescu, K. Bekk, W. Hafemann, I.M. Brancus, F. Badea, T. Antoni, Ashot Chilingarian, D. Mühlenberg, T. Wiegert, J. Milke, H.O. Klages, C. Büttner, H. Ulrich, M. Risse, Hermann-Josef Mathes, A. Vardanyan, J. Knapp, P. Doll, G. Schatz, Kai Daumiller, H. J. Gils, F. Feßler, J. Wochele, J. Kempa, H. Rebel, D. Heck, Karl-Heinz Kampert, R. Glasstetter, Markus Roth, J. Engler, and S. Zagromski

Subjects
Physics, High energy, Air shower, Muon, KASCADE, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Instrumentation and Methods for Astrophysics, Gamma ray, Astrophysics, Gamma-ray astronomy, Electron, Gamma-ray burst
Abstract

The experimental results of the KASCADE Extensive Air Shower experiment have been searched for events which might be attributed to high energy primary gamma rays. The observed data are compared with simulated gamma showers. Events with a very low muon to electron ratio, a smooth lateral electron distribution and an age characteristic of gamma induced events are selected. This contribution describes the applied methods. So far only a very small fraction of the KASCADE results has been studied and no positive identification can yet be claimed.

Published
2001

10. The KASCADE view of cosmic rays

Author

H. Bozdog, B. Vulpescu, H.J. Mayer, P. Doll, J. Milke, A. Haungs, J. Zabierowski, E. Bollmann, T. Thouw, J.R. Hörandel, R. Glasstetter, H. J. Mathes, J. Kempa, R. Haeusler, F.K. Schmidt, T. Wiegert, I.M. Brancus, H.J. Gils, D. Wochele, J. Knapp, K. Bernlöhr, J. Wentz, D. Mühlenberg, W. Hafemann, T. Antoni, J.H. Weber, S. Zagromski, Markus Roth, H. Rebel, Kai Daumiller, J. Engler, M. Petcu, K. Bekk, Markus Risse, F. Badea, Karl-Heinz Kampert, Tadeusz Wibig, Ashot Chilingarian, W. D. Apel, J. Oehlschläger, F. Feßler, H. Ulrich, J. Wochele, D. Heck, A. Vardanyan, G. Schatz, T. Holst, and H.O. Klages

Subjects
Physics, Nuclear and High Energy Physics, KASCADE, Electron flux, Mass spectrum, Astronomy, Cosmic ray, Angular dependence, Astrophysics, Atomic and Molecular Physics, and Optics

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