Experimental results are presented on the charge, velocity, and angular distributions of intermediate mass fragments (IMFs) for the reaction Fe+Au at bombarding energies of 50 and 100 MeV/nucleon.Results are compared to the quantum molecular dynamics (QMD) model and a modified QMD which includes a Pauli potential and follows the subsequent statistical decay of excited reaction products. The more complete model gives a good representation of the data and suggests that the major source of IMFs at large angles is due to multifragmentation of the target residue.PACS number(s): 25.70.Mn
Abstract. To make a laboratory experiment an efficient tool for the studying the dynamical astrophysical phenomena, it is desirable to perform them in such a way as to observe the scaling invariance with respect to the astrophysical system under study. Several examples are presented of such scalings in the area of magnetohydrodynamic phenomena, where a number of scaled experiments have been performed. A difficult issue of the effect of fine-scale dissipative structures on the global scale dissipation-free flow is discussed. The second part of the paper is concerned with much less developed area of the scalings relevant to the interaction of an ultra-intense laser pulse with a pre-formed plasma. The use of the symmetry arguments in such experiments is also considered.
The spectral shape and multiplicity of neutrons from the reaction of ' N+Ag at E/A =20 and 35 MeV have been measured for neutrons in coincidence with intermediate mass nuclei emitted at 5G', 70', and 90'. The spectral shape clearly suggests two moving sources. The slower source velocity is about 80% of the center-of-mass velocity for E/A =20 MeV and 65% of the center-of-mass velocity for E/A =35 MeV (9% and 7% of the beam velocity, respectively). The faster source velocity is slightly less than half of the beam velocity for each case. Knowledge of the neutron multiplicity is necessary for models which attempt to explain the low effective temperature which has been determined from recent measurements of excited state populations. The data are also compared to the Boltzmann master equation approach of Harp, Miller, and Berne.
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