Abstract
The PAMELA satellite-borne experiment was launched on 15 June 2006 from the Baikonur cosmod- rome and it has been collecting data since then. The apparatus comprises a time-of-flight system, a silicon- microstrip magnetic spectrometer, a silicon-tungsten electro- magnetic calorimeter, an anticoincidence system, a shower tail counter scintillator and a neutron detector. The com- bination of these devices allows precision studies of the charged cosmic radiation to be conducted over a wide en- ergy range (100 MeV 1 TeV) with high statistics, with par- ticular focus on the antiparticle component. In this work we present 3 He/ 4 He isotopic ratio in the energy range from 100 MeV nucleon -1 to 1 GeV nucleon -1 . The mea- sured abundances are compared with different interstel- lar/heliospheric propagation calculations which are tuned on previous proton and helium measurements.
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