New Properties of Neon, Magnesium Silicon and Sulfur Primary Cosmic Rays observed by the Alpha Magnetic Spectrometer on the International Space Station.

Neon, Magnesium, Silicon and Sulfur nuclei in cosmic rays are thought to be mainly of primary origin, they are mainly produced and accelerated in astrophysical sources, hence precise knowledge of their spectra provides important insights to the origin, acceleration and subsequent propagation processes of cosmic rays in the Galaxy. We report precise measurements of the Ne, Mg, Si and S individual fluxes in the rigidity range from 2 GV to 3 TV obtained by AMS from the data collected during its first 7 years of operation. A comparison to the spectra of primary Helium, Carbon and Oxygen nuclei reveals new unexpected properties.