Speaker
Description
The spectral shape of the secondary isotopes in cosmic rays is completely determined by the source spectrum of the parent elements and by the propagation process. In particular, 3He in cosmic rays is believed to result from the interaction of primary 4He with the interstellar medium, providing a powerful tool to constrain the parameters of the galactic cosmic rays propagation models. A precise measurement of the helium isotopes ratio (3He/4He) and the individual 3He and 4He fluxes in the kinetic energy per nucleon range from 1.0 GeV/nucl to 10 GeV/nucl based on data collected by AMS during the first 5 years of operation are presented.
The 6Li/7Li ratio, as both isotopes are secondary and stable, is expected to reflect the ratio between the production cross sections and therefore constitute a good check of the reconstruction method. Measurement of the lithium isotopes ratio (6Li/7Li) as a function of the kinetic energy per nucleon from 0.5 GeV/nucl to 10 GeV/nucl based on data collected by AMS during the first 5 years of operation is presented.
