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Measurement of the chemical and isotopic composition of cosmic rays isessential for the precise understanding of their propagation in the galaxy.While the model parameters are mainly determined using the B/C ratio, the studyof extended sets of ratios can provide stronger constraints on the propagationmodels. In this paper the relative abundances of the light nuclei lithium,beryllium, boron and carbon are presented. The secondary to primary ratiosLi/C, Be/C and B/C have been measured in the kinetic energy range 0.35-45GeV/nucleon. The isotopic ratio 7Li/6Li is also determined in the magneticrigidity interval 2.5-6.3 GV. The secondary to secondary ratios Li/Be, Li/B andBe/B are also reported. These measurements are based on the data collected bythe Alpha Magnetic Spectrometer AMS-01 during the STS-91 space shuttle flightin 1998 June. Our experimental results are in substantial agreement with othermeasurements, where they exist. We describe our light-nuclei data with adiffusive-reacceleration model. A 10-15% overproduction of Be is found in themodel predictions and can be attributed to uncertainties in the productioncross-section data.

Relative Composition and Energy Spectra of Light Nuclei in Cosmic Rays. Results from AMS-01