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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
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Abstract

Multiple emission of intermediate-mass fragments has been studied for the collisions of p, $^4$He and $^{12}$C on Au with the $4π$ setup FASA. In the case of $^{12}$C(22.4 GeV)+Au and $^4$He(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 $^{12}$C+Au collisions).

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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. 2001-02-17. Transition from Thermal to Rapid Expansion in Multifragmentation of Gold Induced by Light Relativistic Projectiles. https://doi.org/10.1016/s0370-2693(01)00227-1

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