Abstract
The nuclear emulsion was exposed at CERN by the lead projectile at 160 A GeV. The angles between any pair of fragments with Z =2 i 4 have been measured in the emulsion plane for the events which did not contain heavy fragments. The constant characterizing the normal angle (') distribution of the fragment momentum projection onto the emulsion plane with respect to initial projectile momentum p0 is found to be ae' =( 0:37§ 0:02) mrad. Corresponding value ae0 = (121§ 6) MeV/c of nucleon momentum distribution in the lead nucleus coincides with that expected from Fermi momentum distribution for this nucleus. The peak in the pair-angle distribution of double-charged fragments, 8 Be! 2fi, is presented for the region of small angles (< 0:1 mrad). The fraction of fi-particles coming from the decay of the ground state 8 Be is found to be (13§ 2)% of their whole number.
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