1,459 research outputs found
Elucidating the lack of magnetic order in the heavy-fermion CeCu2Mg
No full textMagnetic, transport, and thermal properties of CeCu2Mg are investigated to elucidate the lack of magnetic order in this heavy-fermion compound with a specific heat value, Cmag/T|T→0≈1.2 J/mol K2 and robust effective magnetic moments (μeff≈2.46μB). The lack of magnetic order is attributed to magnetic frustration favored by the hexagonal configuration of the Ce sublattice. In fact, the effect of magnetic field on Cmag/T and residual resistivity ρ0 does not correspond to that of a Fermi liquid (FL) because a broad anomaly appears at Tmax≈1.2 K in Cmag(T)/T, without changing its position up to μ0H=7.5 T. However, the flattening of Cmag/T|T→0 and its magnetic susceptibility χT→0, together with the T2 dependence of ρ(T), reveal a FL behavior for T≤2 K which is also supported by Wilson and Kadowaki-Woods ratios. The unusual coexistence of FL and frustration phenomena can be understood by placing paramagnetic CeCu2Mg in an intermediate section of a frustration-Kondo model. The entropy, Smag, reaches 0.87Rln6 at T≃100 K, with a tendency to approach the expected value Smag=Rln6 of the J=5/2 ground state of Ce3+.Fil: Michor, H.. Technische Universitat Wien; AustriaFil: Sereni, Julian Gustavo Renzo. Comisión Nacional de Energía Atómica. Gerencia del Area de Investigación y Aplicaciones No Nucleares. Gerencia de Física (Centro Atómico Bariloche). División Bajas Temperaturas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; ArgentinaFil: Giovannini, M.. CNR-SPIN Corso Perrone, Genova; Italia. Università degli Studi di Genova; ItaliaFil: Kampert, E.. Helmholtz-Zentrum Dresden-Rossendorf; AlemaniaFil: Salamakha, L.. Technische Universitat Wien; AustriaFil: Hilscher, G.. Technische Universitat Wien; AustriaFil: Bauer, E.. Technische Universitat Wien; Austri
The KASCADE Experiment: Status and Physics Overview K.-H. Kampert
No full textThe new extensive air shower (EAS) experiment KASCADE has started data taking at the laboratory site of the Forschungszentrum Karlsruhe. The major goal is to determine the flux spectrum and the chemical composition of primary cosmic ray particles in the energy range around and above the knee (10 E prim 10 17 eV). An important advantage of the new multi-detector installation is the capability to simultaneously measure the electromagnetic, muonic, and hadronic component of EAS event-by-event. This provides the means to address many different questions related to EAS and high-energy interactions and to reduce systematic uncertainties to a large extend. We shall present the status of the experiment, discuss the stability and reconstruction accuracies, and give a brief overview of the first results
Recommended from our members
Validation of the real and simulated data of the pierre auger fluorescence telescopes
No full textThe fluorescence detector (FD) of the Pierre Auger Observatory is currently operating 18 fluorescence telescopes of the 24 that will be employed in the completed detector. These telescopes, grouped in 4 eyes each consisting of 6 telescopes, measure the longitudinal profile of cosmic ray showers with a 14% duty cycle. The reconstruction capability and triggering efficiency have been studied using a complete simulation and reconstruction production chain, employing both simulated CORSIKA showers and parameterized Gaisser-Hillas profiles. The propagation through the atmosphere and the detector response are taken into account and simulated in detail. These simulated data have been generated in a preliminary analysis using the method of importance sampling to efficiently cover the energy region of 0.3-300 EeV, various shower geometries and impact points and different primary particles. The distributions of observables have then been investigated in both real and simulated data, facilitating the validation of the reconstruction and simulation software. Comparisons of real and simulated data are discussed and used to assess their impact on the data analysis
Observation of microwave emission from extensive air showers with CROME
No full textWe report on the measurement of microwave radio signals from air showers with the CROME (Cosmic Ray Observation via Microwave Emission) experiment. CROME is located in the center of the KASCADE-Grande air shower array. The radio signals of the CROME antennas are stored for each high-energy trigger from the KASCADE-Grande array and matched offine with the KASCADE-Grande data. After almost one year of data taking microwave signals have been observed for more than ten air showers
Test hadronischer Wechselwirkungsmodelle mittels Untersuchung der hadronischen Komponente ausgedehnter Luftschauer
No full textVerbesserung der Winkelauflösung des Myonspurdetektors von KASCADE und Bestimmung von Myonproduktionshöhen
No full textUntersuchungen zum primären Energiespektrum der kosmischen Strahlung im PeV-Bereich mit dem KASCADE-Experiment
No full textUntersuchung der hadronischen Komponente ausgedehnter Luftschauer und Messung der Elementzusammensetzung der kosmischen Strahlung
No full text- …
