Abstract
Exclusive-type experimental data on the emission of projectile helium fragments from the interactions of {sup 56}Fe nuclei in the emulsion at 1.88{ital A} GeV (the dependence of angular distribution and mean multiplicity on the number of shower particles) are presented and discussed. The angular distribution is interpreted by simple superposition of well-known processes without assuming the existence of fireballs. In this paper, we present an interpretation on production of He fragments: A {sup 4}He fragment is produced in a pickup process of a {ital p}-{ital n} pair by scattered {ital p}-{ital n} pair, and a {sup 3}He fragment is produced by recombining a {ital p}-{ital n} pair and a proton that are scattered into small phase volume.
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