12 research outputs found
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Population of Nuclei Via 7Li-Induced Binary Reactions
The authors have investigated the population of nuclei formed in binary reactions involving {sup 7}Li beams on targets of {sup 160}Gd and {sup 184}W. The {sup 7}Li + {sup 184}W data were taken in the first experiment using the LIBERACE Ge-array in combination with the STARS Si {Delta}E-E telescope system at the 88-Inch Cyclotron of the Lawrence Berkeley National Laboratory. By using the Wilczynski binary transfer model, in combination with a standard evaporation model, they are able to reproduce the experimental results. This is a useful method for predicting the population of neutron-rich heavy nuclei formed in binary reactions involving beams of weakly bound nuclei and will be of use in future spectroscopic studies
Isospin dependence of relative yields of and mesons at 1.528 AGeV
Results on and meson production in Ru +
Ru and Zr + Zr collisions at a beam kinetic
energy of 1.528 GeV, measured with the FOPI detector at GSI-Darmstadt, are
investigated as a possible probe of isospin effects in high density nuclear
matter. The measured double ratio ()/() is
compared to the predictions of a thermal model and a Relativistic Mean Field
transport model using two different collision scenarios and under different
assumptions on the stiffness of the symmetry energy. We find a good agreement
with the thermal model prediction and the assumption of a soft symmetry energy
for infinite nuclear matter while more realistic transport simulations of the
collisions show a similar agreement with the data but also exhibit a reduced
sensitivity to the symmetry term.Comment: 5 pages, 3 figures. accepted for publication in Phys. Rev.
Systematic study of fusion barriers with energy dependent barrier radius
Considering energy dependence of the barrier radius in heavy-ion fusion
reactions, a modified Siwek-Wilczy\'{n}ski (MSW) fusion cross section formula
is proposed. With the MSW formula, the fusion barrier parameters for 367
reaction systems are systematically extracted, based on 443 datasets of
measured cross sections. We find that the fusion excitation functions for about
reaction systems can be better described by introducing the energy
dependence of the barrier radius which is due to the dynamical effects at
energies near and below the barrier. Considering both the influence of the
geometry radii and that of the reduced de Broglie wavelength of the colliding
nuclei, the barrier heights are well reproduced with only one model parameter.
The extracted barrier radius parameters linearly decrease with the effective
fissility parameter, and the width of the barrier distribution relates to the
barrier height and as well as the reduced de Broglie wavelength at energies
around the Coulomb barrier.Comment: 9 figures, 1 table, accepted for publication in Atomic Data and
Nuclear Data Table
Re-separation modes of Au-197+Au-197 system at sub-Fermi energies
Collisions of a very heavy nuclear system, 197Au + 197Au, were studied at the energy of 15 MeV/nucleon with the aim to identify and investigate main macroscopic modes of re-separation of such a heavy nuclear system. The experiment was performed at the INFN LNS laboratory in Catania by using the multidetector array CHIMERA. Along with binary strongly damped collisions, a strong component of a new re-separation mode: the "fast ternary fission" in characteristic nearly co-linear configuration was observed and the time scale of this process was determined
Dynamical emission of heavy fragments in the 112,124Sn+58,64Ni reactions at 35 AMeV as seen with CHIMERA
A quantitative comparison regarding absolute cross sections associated to Statistical and Dynamical Fission in the system 124Sn+64Ni and112Sn+58Ni experimentally investigated at 35 AMeV beam energy is presented. It results that Dynamical Fission process is about two times more probable in the neutron rich 124Sn+64Ni system than in the 112Sn+58Ni neutron poor one. At this point of our analysis it is not clear if the observed difference is originated by different entrance channel Isospin (N/Z) content or by different size between the two investigated systems