Evolution of 11B/10B as a function of metallicity (left) and time (right). Solid curves correspond to the total 11B production (GCR + ν-nucleosynthesis) and dashed curves to 11B produced by GCR alone. The meteoritic (=solar) value (11B/10B)⊙ = 4.02 (Lodders 2003) is indicated at [Fe/H] = 0 and at time t = 7.5 Gyr, whereas the local value (11B/10B)0 = 3.4 ± 0.7 (Lambert et al. 1998) is plotted at t = 12 Gyr.
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