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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. Among severaldetector subsystems, AMS includes a proximity focusing RICH enabling precisemeasurements of particle electric charge and velocity. The combination of boththese measurements together with the particle rigidity measured on the silicontracker endows a reliable measurement of the particle mass. The main topics ofthe AMS-02 physics program include detailed measurements of the nuclearcomponent of the cosmic-ray spectrum and the search for indirect signatures ofdark matter. Mass separation of singly charged particles, and in particular theseparation of deuterons and antideuterons from massive backgrounds of protonsand antiprotons respectively, is essential in this context. Detailed MonteCarlo simulations of AMS-02 have been used to evaluate the detector'sperformance for mass separation at different energies. The obtained results andphysics prospects are presented.

Particle identification with the AMS-02 RICH detector: D/p and anti-D/anti-p separation