Effect of nano-structuring on hydrogen sorption properties of LaNi5 systems

I raggi cosmici: cosa sono, da dove provengono, che messaggio portano.

Una pioggia continua di oltre 100 particelle al secondo ci colpisce e ci attraversa, in ogni luogo della Terra, in ogni istante della nostra vita. Si tratta dei raggi cosmici che pervadono l’universo e colpiscono la Terra in modo isotropo (senza alcuna direzione privilegiata) proveniendo dal cosmo, e verosimilmente sia dall’interno che dall’esterno della nostra Galassia. La loro energia è estremamente variabile, ma più è grande, meno frequenti essi sono. Essi contengono dei messaggi la cui interpretazione ci consentirebbe di conoscere una grande messe di informazioni sui fenomeni che avvengono nello spazio e che coinvolgono la nascita, la formazione e la morte delle stelle e degli altri cor…

EUSO Science

EUSO is a mission to explore the extreme universe by the probe of Ultra High Energy Cosmic Rays (LTHECRs) and LTHE neutrinos [1]. EUSO monitors a gigantic volume of atmosphere from Space and measures showers induced by UHECRs and UHE neutrinos. Scientifically, it is important to measure the energy spectrum of UHECRs well beyond GZK energy with high statistics. EUSO ensures the observation of UHECRs up to 10(21) eV even in the case of GZK mechanism working [2-7], and gives us a clear picture of the existence / non-existence of the GZK effect and the behavior of the spectrum beyond GZK energy, which represents the contributions from nearby sources. The anisotropy study of UHECR arrival direct…

A multiscale method for gamma/h discrimination in extensive air showers

We present a new method for the identification of extensive air showers initiated by different primaries. The method uses the multiscale concept and is based on the analysis of multifractal behaviour and lacunarity of secondary particle distributions together with a properly designed and trained artificial neural network. The separation technique is particularly suited for being applied when the topology of the particle distribution in the shower front is as largely detailed as possible. Here, our method is discussed and applied to a set of fully simulated vertical showers in the experimental framework of ARGO-YBJ, taking advantage of both the space and time distribution of the detected sec…

ECRS, P.Vallania et al, "Cerenkov light measurements for the Euso Project",

Simulation Study of a Space-Based detector for UHECR observation.

The next generation of experiments devoted to the study of the cosmic rays spectrum above 10(20) eV will be most likely done by means of space based detectors. In order to detect the fluorescence and Cerenkov signal generated by an EAS in atmosphere, severe requirements on the photon collection efficiency and on the triggering capability need to be met. In this paper we report about of preliminary studies of the triggering efficiency of a space based detector as a function of the main detector parameters. All results are obtained by means of a detailed simulation of the shower development, atmospheric response, detector geometry and electronics and trigger behavior in realistic conditions b…

Synthesis and characterization of nanocrystalline LaNi5 hydrogen storage materials

With the growing environmental concerns of greenhouse gas emissions from the burning of fossil fuels, it is becoming increasingly important to switch to cleaner alternative fuels such as hydrogen [1]. Inter-metallic LaNi5 is one of the most widely used and studied solid-state hydrogen storage material – a pet material for the prototype systems using hydrogen fuel. However, nanostructuring effects on this systems are not yet fully explored. Recently we have carried out systematic studies regarding the effect of nanostructuring on the hydrogen sorption properties of this material [2]. Unlike some other potential hydrogen storage materials, which shows faster kinetics upon nanostructuring, the…

Hydrogen sorption properties of the composite system calcium hydride – magnesium boride

Diffused Cerenkov light measurements for the Euso Project

Cerenkov light measurement for the EUSO Experiment

The EUSO Simulation and Analysis Framework

A search for quarks in the CERN SPS neutrino beam

Quarks and leptons are the only pointlike particles known so far. However, a search for a proton-breaking mechanism in high-energy neutrino-nucleon interactions had never been performed. We present here the results of the first experiment in this field.

Evidence of the same multiparticle production mechanism in p−p collisions as in e+e− annihilation

The split-field magnet spectrometer at the CERN intersecting storage rings was used to measure, in p-p collisions at square root s=62 GeV, the inclusive momentum distribution of the charged particles produced in the same hemisphere as the leading proton (x>0.4). A new scaling variable was introduced in order to take into account baryon-number conservation effects in p-p interactions. It is shown that distributions in this variable are in good agreement with the momentum distribution of the hadrons produced in e/sup +/e/sup -/ annihilation. The results suggest that the multiparticle production mechanism in p-p collisions is the same as in e/sup +/e/sup -/ provided that the effects of baryon-…