Description
Charged cosmic rays - astrophysics and dark matter
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Prof. John Wefel (Louisiana State University)01/08/2011, 14:00Charged cosmic raysOralThe Advanced Thin Ionization Calorimeter (ATIC) balloon experiment traveled to McMurdo, Antarctica four times, resulting in three successful circumpolar flights: ATIC-1, a test flight; ATIC-2, a science flight; ATIC-3, a balloon failure; ATIC-4, the final science flight. In particular, ATIC-4 provided the data to understand the discrepancy between the H, He spectra reported from...Go to contribution page
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Dr Carmelo Sgro' (INFN-Pisa)01/08/2011, 14:30Charged cosmic raysOralWith a precise measurement of the combined Cosmic-Ray electron and positron spectrum, the Fermi Large Area Telescope (LAT) has proven to be an excellent electron detector. Being a purely calorimetric experiment, the LAT is not capable to directly distinguish particle charge. However, we can exploit the Earth's magnetic field to effectively separate negatively and positively charged...Go to contribution page
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Dr Emiliano Mocchiutti (INFN (Istituto Nazionale di Fisica Nucleare) Trieste)01/08/2011, 15:00Charged cosmic raysOralPAMELA is a satellite borne experiment designed to study with great accuracy cosmic rays in a wide energy range. The study of the antimatter component is one of the PAMELA main objectives. The lepton component of cosmic radiation has been measured by PAMELA in a wide energy range with unprecedent sensitivity. The experiment, housed on board the Russian Resurs-DK1 satellite, was launched...Go to contribution page
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Rene Ong (LLR-Ecole Polytechnique/UCLA)01/08/2011, 16:00Charged cosmic raysOralThe General Antiparticle Spectrometer (GAPS) experiment is a balloon-borne instrument designed to detect low-energy (< 0.5 GeV/n) anti-deuterons, which could be a signature for dark matter annihilation. In the energy region probed by GAPS, very little anti-deuteron background is expected from conventional astrophysical sources and hence the detection by GAPS of even a few anti-deuterons...Go to contribution page
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Dr Giuseppe Di Sciascio (INFN - Sezione di Roma Tor Vergata)01/08/2011, 16:25Charged cosmic raysOralThe ARGO-YBJ experiment, located at the Yangbajing Cosmic Ray Laboratory (Tibet, 4300 m asl, 606 g/cm2), is an EAS-array exploiting the full coverage approach at high altitude. We analyzed the data taken since November 2007 looking for anisotropies in the arrival directions of cosmic rays on different angular scales. The results of the analysis are reported and compared with other...Go to contribution page
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Prof. Scott Nutter (Northern Kentucky University)01/08/2011, 16:50Charged cosmic raysOralThe Cosmic Ray Electron Synchrotron Telescope (CREST) high-altitude balloon experiment is a pathfinding effort to detect multi-TeV cosmic-ray electrons. These electrons would be indicative of nearby cosmic accelerators, since energetic electrons from distant Galactic sources are depleted by radiative losses during interstellar transport. The electrons will be detected indirectly by...Go to contribution page
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Dr Elena Vannuccini (INFN - Firenze)01/08/2011, 17:15Charged cosmic raysOralThe PAMELA experiment has recently reported results on the absolute fluxes of hydrogen and helium nuclei. The high-precision measurement performed by the experiment revealed for the first time interesting spectral features, which are presently at the centre of a lively debate. In this presentation the results will be discussed focusing on the experimental issues related to the measurement.Go to contribution page
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Dr Giuseppe Di Sciascio (INFN - Sezione di Roma Tor Vergata)01/08/2011, 17:40Charged cosmic raysOralCosmic ray antiprotons provide an important probe for the study of cosmic-ray propagation in the interstellar space and to investigate the existence of Galactic dark matter. The ARGO-YBJ experiment, located at the Yangbajing Cosmic Ray Laboratory (Tibet, P.R. China, 4300 m a.s.l., 606 g/cm$^2$ ), is the only experiment exploiting the full coverage approach at very high altitude presently...Go to contribution page
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Dr Antje Putze (Oskar Klein Center (Stockholm University))02/08/2011, 14:00Charged cosmic raysOralWe implemented a Markov Chain Monte Carlo technique to estimate the probability-density functions of the cosmic-ray transport and source parameters in a diffusion model. From the measurement of the B/C ratio and radioactive cosmic-ray clocks, we calculate their probability density functions, with a special emphasis on the halo size L of the Galaxy and the local underdense bubble of size...Go to contribution page
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Dr Torsten Bringmann (University Hamburg)02/08/2011, 14:30Charged cosmic raysOralIt is well established that even very simple phenomenological two-zone diffusion models of the galactic halo can reproduce cosmic-ray nuclear data, and the observed antiproton flux, surprisingly well. Here, we consider lepton propagation in such models and compute the expected galactic population of electrons, as well as the diffuse synchrotron emission that results from their interaction...Go to contribution page
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Dr Sergey Ostapchenko (Norwegian University for Science and Technology (NTNU))02/08/2011, 14:55Charged cosmic raysOralWe calculate the production and re-acceleration of secondary nuclei in supernova remnants using a time-dependent treatment of the acceleration process. The obtained spectra are compared to results of other recent calculations. The predictions for the energy-dependence of B/C and Ti/Fe ratios are presented and the implications for cosmic ray propagation models are discussed.Go to contribution page
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Ms Juan Wu (KTH and Oskar Klein Centre)02/08/2011, 16:00Charged cosmic raysOralWe are studying the constraints obtained on transport and acceleration mechanisms of galactic cosmic rays by using statistical tools, such as genetic algorithms or multimodal nested sampling algorithms, linked with the propagation package GALPROP and recent PAMELA data. Using only PAMELA data allows us to avoid inconsistencies between data sets from different experiments, minimize...Go to contribution page
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Mr Stefan Vogl (Technische Universitaet Muenchen)02/08/2011, 16:25Charged cosmic raysOralIt is well known that the annihilation of Majorana dark matter particles into light leptons can be significantly enhanced by electromagnetic bremsstrahlung processes, which give rise to potentially observable signal in gamma-rays. Due to the gauge invariance, this mechanism inevitably leads to electroweak bremsstrahlung processes, which in turn lead to the production of antiprotons...Go to contribution page