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From these data can be very easy determined the time life T, of CR particles relative to nuclear interactions in space plasma with density p:

where v, is the velocity of CR particles of type i.

1.3.2. CR fragmentation in space plasma

Nuclear interactions of CR particles of type j with the matter of space plasma lead to their fragmentation and formation of nuclei of type i, where i < j (we assume that i and j increase with increasing of Z). The contents nt of CR in space plasma will be determined by following equation:

d Ti j>i Tj where k is the diffusion coefficient of CR in space plasma (determined by the distribution of magnetic fields in space), Qi (r, t) is the source function, Ti is the time life of CR particles relative to nuclear interactions (determined by Eq. 1.3.1), Pji is the coefficient of fragmentation (i.e. average number of nuclei of type i formatted from one more heavy nuclei of type j > i). The approximate values of Pjt for a particles and groups of nuclei L, M, and H are shown in Table 1.3.2, and more detailed data for relativistic nuclei from Li to Fe in Table 1.3.3.

Table 1.3.2. Approximate values of Pp for a particles and groups of nuclei L, M, and H. According to Fowler et al. (1957).

Primary nuclei of CR

Generated daughter nuclei

H (Z > 10)

M (6 < Z < 9)

L (3 < Z < 5)

a (Z = 2)

H (Z > 10)

0.31±0.07

0.36±0.07

0.12±0.04

1.35±0.18

M (6 < Z < 9)

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