Abstract
An exclusive-type study of the transverse momentum distribution of alpha particles emerging as relativistic projectile fragments from collisions of a 1.9 GeV/nucleon 56Fe beam in nuclear emulsion reveals that the events fall into either one or the other of two distinct classes with sharply differing characteristics. Each of these classes is characterised by a Maxwellian distribution in the projectile rest frame, but the associated temperatures differ by a factor of about four (namely approximately=10 MeV and approximately=40 MeV; the same 40 MeV temperature is observed among target-related alpha particles emitted from 12C collisions in nuclear emulsion at 0.87 GeV/nucleon and 2.1 GeV/nucleon). The authors show that the 'hot' (T approximately=40 MeV) events are not simulated by 'projectile bounce' effects, and that they occur among events of high multiplicity as well as among those of low multiplicity. They are regarded as direct evidence for a highly collective mechanism.
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