A method of making large thin plastic scintillator foils with good uniformity is presented. The use of Fourier Transform Infrared Spectroscopy (FTIR) to test the foil uniformity and to establish an ...empirical thickness calibration curve is described.
The entropy per nucleon (ital S/ital A) has been extracted for the Au (150--800)ital A MeV + Au reaction by using the phase I setup of the 4pi facility at GSI, Darmstadt. The entropy has been ...obtained from the comparison of various observables characterizing the ital dM/ital dZ fragment multiplicity distributions, extending up to ital Zsimilar to15, with those calculated with the quantum statistical model. It is the first time that ital S/ital A values are determined by considering the full ensemble of charged products detected in the reaction. Consistent values of ital S/ital A are found from different methods. These entropy values are shown to be fairly independent of the volume of the participant'' region considered. They are somewhat lower than those extracted in earlier works but are in good agreement with hydrodynamic calculations and suggest a low viscosity for the hot and dense nuclear matter.
Light-particle emission from Au+Au collisions has been studied in the bombarding-energy range 100–250
A·MeV, using
ΔE−
E
R telescopes in coincidence with the FOPI detector in its
phase I ...configuration. Center-of-mass energy spectra have been measured for
Z = 1,2 isotopes emitted in central collisions at CM polar angles between 60° and 90°. Evidence for a collective expansion is reported, on the basis of the mean kinetic energies of hydrogen isotopes. Comparison is presented with statistical calculations (WIX code). For CM kinetic energy spectra, fair agreement is found between data and a recently developed transport model.
