The experimental results of the emission of hammer tracks ( 8,9 Li, 8 B nuclei) from 3-GeV/c iT~-meson interactions are compared with the theory of nuclear evaporation. The results are only in partial agreement with this theory. The production rate increases with incident energy from 0.8 up to 3 GeV/c. The forwardto-backward ratios decrease when the energy of the incident particle rises.T HE investigation of the fragmentation and hyperfragmentation processes in interactions of Kr mesons with complex nuclei 1-4 was extended to a higher energy of the incoming particles to study the influence of primary energy on these mechanisms. (a) (b) 15 20 25 30 Nh FIG. 1. Distribution of Nh, the number of black plus grey prongs, of (a) a random sample of 606 beam stars without hammer-track emission found at Hamburg, and (b) 221 beam stars with hammertrack emission. The dotted line represents hammer tracks with an energy £>40 MeV.
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