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VOLUME 49 (1989) | ISSUE 11 | PAGE 584
Production of soft pions in hA interactions
The yields and the transverse dimensions of the region of generation of soft (30to 60-MeV) π+ mesons, which are produced in С and Pb nuclei as a result of bombardment with 7.5-GeV/c protons and 5-GeV/c v~~ mesons, have been measured. The inclusive characteristics of these mesons are the same as those of hard pions. The transverse dimension of the generation region is rf = 0.8 + 0.4 fm and rfb = 2.3 + 0.2 fm, in agreement with the model for a systematic knocking out of particles from the region adjacent to the path of a fast primary particle in the nucleus.