Showing papers by "L. Tassan-Got published in 2000"
TL;DR: Spallation residues produced in 1 GeV per nucleon 208Pb on proton reactions have been studied using the Fragment Separator facility at GSI and the obtained cross sections agree with most of the few existing gamma-spectroscopic data.
Abstract: Spallation residues produced in 1 GeV per nucleon ${}^{208}\mathrm{Pb}$ on proton reactions have been studied using the Fragment Separator facility at GSI. Isotopic production cross sections of elements from ${}_{61}\mathrm{Pm}$ to ${}_{82}\mathrm{Pb}$ have been measured down to 0.1 mb with a high accuracy. The recoil kinetic energies of the produced fragments were also determined. The obtained cross sections agree with most of the few existing gamma-spectroscopic data. The data are compared with different intranuclear-cascade and evaporation-fission models. Drastic deviations were found for a standard code used in technical applications.
55 citations
TL;DR: In this paper, the authors analyzed angular and velocity distributions of light charged particles, and fragments, and found that there is a certain amount of matter in excess emitted between the two primary sources suggesting either the existence of a mid-rapidity source similar to the one observed in the relativistic regime (participants), or a strong deformation induced by the dynamics of the collision (neck instability).
42 citations
TL;DR: In this paper, intermediate velocity products in Ar+Ni collisions from 52 to 95 A were studied in an experiment performed at the GANIL facility with the 4$\pi$ multidetector INDRA.
36 citations
TL;DR: In this article, a new method for the selection of central single-source events, based on classical multivariate techniques, was introduced for the Ni+Ni at 32A MeV system measured with the INDRA multidetector, which enabled the determination of the fusion probability as a function of the impact parameter and the evaluation of the corresponding cross section.
Abstract: This paper introduces a new method for the selection of central single-source events, based on classical multivariate techniques. The resulting discriminating variable is shown to be valid for different hypotheses on the nuclear source deexcitation mechanism. It enables the selection of events which are representative of the whole set of single-source events. Application to the Ni+Ni at 32A MeV system measured with the INDRA multidetector has allowed the determination of the fusion probability as a function of the impact parameter and the evaluation of the corresponding cross section.
24 citations
TL;DR: In this paper, the correlation of the system 129Xe+NatSn at 50 AMeV has been measured with the 4π INDRA which provides a complete kinematical description of each event.
Abstract: Proton and deuteron correlation functions have been investigated with both impact parameter and emission source selections. The correlations of the system 129Xe+NatSn at 50 AMeV have been measured with the 4π INDRA which provides a complete kinematical description of each event. The emission time scale analyzed with a quantum model reveals the time sequence of the light particles emitted by the projectile-like fragment. The short and constant emission time of the proton, independent of the impact parameter, can be attributed to a preequilibrium process.
21 citations
TL;DR: In this paper, the quasi-projectile (QP) properties of the Ar+Ni collisions at 95 A MeV were investigated taking into account the intermediate velocity emission, and the number of particles emitted in this intermediate velocity region is related to the overlap volume between projectile and target.
20 citations
TL;DR: In this paper, reaction mechanisms have been studied for two nearly symmetrical systems of different total mass, between 25 and 74 A MeV, and it is shown that collisions are mostly binary whatever the system mass and the bombarding energy.
16 citations
TL;DR: In this article, an improved coalescence model coupled with the intra-nuclear cascade code ISABEL is used to obtain light complex particle energy spectra and multiplicities as a function of impact parameter.
Abstract: The prompt component at intermediate velocity of light charged particles is investigated. An improved coalescence model coupled to the intra-nuclear cascade code ISABEL is used to obtain light complex particle energy spectra and multiplicities as a function of impact parameter. The results are compared with experimental data from the 36Ar + 58Ni experiment at 95 MeV/nucleon, performed with the INDRA 4π detection system. The calculated prompt component is found to rather well reproduce proton spectra. For complex light charged particles the calculated components well populate the high energy part of spectra. Prompt emission can therefore explain the large transverse energies experimentally observed at mid-rapidity.
8 citations
01 Mar 2000-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: In this article, a digital filtering technique of the charge density distribution along the deflection axis in the velocity space is presented to select well-defined event configurations from heavy-ion collisions in the Fermi energy domain.
Abstract: To select well-defined event configurations from heavy-ion collisions in the Fermi energy domain, a digital filtering technique of the charge density distribution along the deflection axis in the velocity space is presented. Charge density appears as a robust variable and can be used for a quantitative comparison of experimental data obtained with 4π arrays and mean-field transport equation predictions.
8 citations
TL;DR: RelRelative angle correlation functions for mid-rapidity protons built up from 50 MeV/u Xe+Sn data recorded by the INDRA multidetector exhibit the characteristics of a non-equilibrated emission as discussed by the authors.
3 citations