Comparative Study of Multifragmentation of Gold Nuclei Induced by Relativistic Protons, ${}^4$He, and ${}^{12}$C

Abstract

Multiple emission of intermediate-mass fragments has been studied for the collisions of p, ${}^4$He and ${}^{12}$C on Au with the $4\pi$ setup FASA. The mean IMF multiplicities (for the events with at least one IMF) are saturating at the value of $2.2\pm 0.2$ for the incident energies above 6 GeV. The observed IMF multiplicities cannot be described in a two-stage scenario, a fast cascade followed by a statistical multifragmentation. Agreement with the measured IMF multiplicities is obtained by introducing an intermediate phase and modifying empirically the excitation energies and masses of the remnants. The angular distributions and energy spectra from the p-induced collisions are in agreement with the scenario of ``thermal'' multifragmentation of a hot and diluted target spectator. In the case of ${}^{12}$C+Au(22.4 GeV) and ${}^4$He(14.6 GeV)+Au collisions, deviations from a pure thermal break-up are seen in the energy spectra of the emitted fragments, which are harder than those both from model calculations and from the measured ones for p-induced collisions. This difference is attributed to a collective flow.

33 pages 15 figures, accepted in Nucl. Phys. A

References in corpus (12)

• Isospin Fractionation in Nuclear Multifragmentation
• Central Collisions of Au on Au at 150, 250 and 400 A MeV
• Thermodynamical features of multifragmentation in peripheral Au + Au Collisions at 35 A.MeV
• Spinodal decomposition of low-density asymmetric nuclear matter
• Evidence for Spinodal Decomposition in Nuclear Multifragmentation
• Statistical evolution of isotope composition of nuclear fragments
• Fragment Kinetic Energies and Modes of Fragment Formation
• Thermal excitation of heavy nuclei with 5-15 GeV/c antiproton, proton and pion beams
• Freeze-out Configuration in Multifragmentation
• Liquid-Gas Phase Transition in Nuclear Equation of State
• Thermally-induced expansion in the 8 GeV/c ${\pi }^{-}$ + ${}^{197}$Au reaction
• Transition from Thermal to Rapid Expansion in Multifragmentation of Gold Induced by Light Relativistic Projectiles

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