Particle identification with the AMS-02 RICH detector: search for dark matter with antideuterons - AstrophysicsReportar como inadecuado




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Abstract: The Alpha Magnetic Spectrometer AMS, whose final version AMS-02 is to beinstalled on the International Space Station ISS for at least 3 years, is adetector designed to measure charged cosmic ray spectra with energies up to theTeV region and with high energy photon detection capability up to a few hundredGeV, using state-of-the art particle identification techniques. It is equippedwith several subsystems, one of which is a proximity focusing Ring ImagingCherenkov RICH detector equipped with a dual radiator aerogel+NaF, alateral conical mirror and a detection plane made of 680 photomultipliers andlight guides, enabling precise measurements of particle electric charge andvelocity Delta beta - beta ~ 10^-3 and 10^-4 for Z=1 and Z=10-20,respectively at kinetic energies of a few GeV-nucleon. Combining velocitymeasurements with data on particle rigidity from the AMS-02 Tracker Delta R -R ~ 2% for R=1-10 GV it is possible to obtain a reliable measurement forparticle mass. One of the main topics of the AMS-02 physics program is thesearch for indirect signatures of dark matter. Experimental data indicate thatdark, non-baryonic matter of unknown composition is much more abundant thanbaryonic matter, accounting for a large fraction of the energy content of theUniverse. Apart from antideuterons produced in cosmic-ray propagation, theannihilation of dark matter will produce additional antideuteron fluxes.Detailed Monte Carlo simulations of AMS-02 have been used to evaluate thedetector-s performance for mass separation, a key issue for anti-D-anti-pseparation. Results of these studies are presented.



Autor: Luísa Arruda, Fernando Barão, Rui Pereira

Fuente: https://arxiv.org/







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