1,612 research outputs found
A Monte Carlo code for full simulation of a transition radiation detector
A full simulation of a transition radiation detector (TRD) based on the
GEANT, GARFIELD, MAGBOLTZ and HEED codes has been developed. This simulation
can be used to study and develop TRD for high energy particle identification
using either the cluster counting or the total charge measurement method. In
this article it will be also shown an application of this simulation to the
discrimination of electrons from hadrons in beams of momentum of few GeV/c or
less, assuming typical TRD configuration, namely radiator-detector modules.Comment: 14 pages with 12 figure
Unfolding spectral analysis of the Fermi-LAT data
The Large Area Telescope (LAT) onboard the Fermi satellite is observing the
gamma-ray sky in the high energy region, above 20 MeV. We have developed a
method to reconstruct the energy spectra of the gamma-rays detected by the
Fermi LAT instrument based on a Bayesian unfolding approach, that takes into
account the energy dispersion introduced by the instrument response. The method
has been successfully applied to reconstruct the energy spectra of both steady
and pulsating point sources. The analysis technique will be illustrated and the
results obtained in some significant test cases will be discussed.Comment: 6 pages, 9 figure
Analysis of the Spectral Energy Distributions of Fermi bright blazars
Blazars are a small fraction of all extragalactic sources but, unlike other
objects, they are strong emitters across the entire electromagnetic spectrum.
In this study we have conducted a detailed investigation of the broad-band
spectral properties of the gamma-ray selected blazars of the Fermi-LAT Bright
AGN Sample (LBAS). By combining the accurately estimated Fermi gamma-ray
spectra with Swift, radio, NIR-Optical and hard-X/gamma-ray data, collected
within three months of the LBAS data taking period, we were able to assemble
high-quality and quasi-simultaneous Spectral Energy Distributions (SED) for 48
LBAS blazars.Comment: 6 pages, 8 figures, "2009 Fermi Symposium", "eConf Proceedings
C091122
Hadronic interactions of primary cosmic rays with the FLUKA code
The measured fluxes of secondary particles produced by the interactions of
cosmic rays with the astronomical environment represent a powerful tool to
infer some properties of primary cosmic rays. In this work we investigate the
production of secondary particles in inelastic hadronic interactions between
several cosmic rays species of projectiles and different target nuclei of the
interstellar medium. The yields of secondary particles have been calculated
with the FLUKA simulation package, that provides with very good accuracy the
energy distributions of secondary products in a large energy range. An
application to the propagation and production of secondaries in the Galaxy is
presented.Comment: 8 pages, 4 figures; Contribution to the 34th International Cosmic Ray
Conference, July 30 to August 6, The Hague, Netherlands; fixing a typo in the
y-axis label of Fig.
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