Description
Charged cosmic rays - astrophysics and dark matter
Prof.
John Wefel
(Louisiana State University)
01/08/2011, 14:00
Charged cosmic rays
Oral
The 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...
Dr
Carmelo Sgro'
(INFN-Pisa)
01/08/2011, 14:30
Charged cosmic rays
Oral
With 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...
Dr
Emiliano Mocchiutti
(INFN (Istituto Nazionale di Fisica Nucleare) Trieste)
01/08/2011, 15:00
Charged cosmic rays
Oral
PAMELA 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...
Rene Ong
(LLR-Ecole Polytechnique/UCLA)
01/08/2011, 16:00
Charged cosmic rays
Oral
The 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...
Dr
Giuseppe Di Sciascio
(INFN - Sezione di Roma Tor Vergata)
01/08/2011, 16:25
Charged cosmic rays
Oral
The 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...
Prof.
Scott Nutter
(Northern Kentucky University)
01/08/2011, 16:50
Charged cosmic rays
Oral
The 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...
Dr
Elena Vannuccini
(INFN - Firenze)
01/08/2011, 17:15
Charged cosmic rays
Oral
The 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.
Dr
Giuseppe Di Sciascio
(INFN - Sezione di Roma Tor Vergata)
01/08/2011, 17:40
Charged cosmic rays
Oral
Cosmic 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...
Dr
Antje Putze
(Oskar Klein Center (Stockholm University))
02/08/2011, 14:00
Charged cosmic rays
Oral
We 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...
Dr
Torsten Bringmann
(University Hamburg)
02/08/2011, 14:30
Charged cosmic rays
Oral
It 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...
Dr
Sergey Ostapchenko
(Norwegian University for Science and Technology (NTNU))
02/08/2011, 14:55
Charged cosmic rays
Oral
We 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.
Ms
Juan Wu
(KTH and Oskar Klein Centre)
02/08/2011, 16:00
Charged cosmic rays
Oral
We 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...
Mr
Stefan Vogl
(Technische Universitaet Muenchen)
02/08/2011, 16:25
Charged cosmic rays
Oral
It 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...
