Transition from Thermal to Rapid Expansion in Multifragmentation of Gold Induced by Light Relativistic Projectiles
S. P. Avdeyev, V. A. Karnaukhov, L. A. Petrov, V. K. Rodionov, V. D. Toneev, H. Oeschler, O. V. Bochkarev, L. V. Chulkov, E. A. Kuzmin, A. Budzanowski, W. Karcz, M. Janicki, E. Norbeck, A. S. Botvina
Abstract
Multiple emission of intermediate-mass fragments has been studied for the collisions of p, 4He and 12C on Au with the 4π setup FASA. In the case of 12C(22.4 GeV)+Au and 4He(14.6 GeV)+Au collisions, the deviations from a pure thermal break-up are seen in the energy spectra of the emitted fragments: the spectra are harder than calculated and than measured in p-induced collisions. This difference is attributed to a collective flow with the expansion velocity on the surface about 0.1 c (for 12C+Au collisions).
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