598 articles – 2951 Notices  [english version]
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Transport Model Simulations of Projectile Fragmentation Reactions at 140 MeV/nucleon
M. Mocko1, 2, M. B. Tsang2, D. Lacroix2, 3, A. Ono4, P. Danielewicz2, W. G. Lynch2, R. J. Charity5
(2008)

The collisions in four different reaction systems using 40,48Ca and 58,64Ni isotope beams and a Be target have been simulated using the Heavy Ion Phase Space Exploration and the Antisymmetrized Molecular Dynamics models. The present study mainly focuses on the model predictions of excitation energy of the hot fragments and the cross sections of final fragments produced in these reactions. The calculated fragment cross sections are compared to the published projectile fragmentation cross sections measured with a mass separator. Experimental efficiency-correction assumptions and their effects in validation of event generator codes are discussed in the light of the reaction dynamics described by these two models. The effects of various factors influencing the calculated cross sections, such as the choice of the statistical decay code and its parameters have been explored. Present study suggests that the CPU requirements and the uncertainties of model parameters including the influence of sequential decay effects limit the use of transport models to make accurate predictions of rare isotope yields from projectile fragmentation. However, our study suggests that detailed comparisons of the experimental versus calculated observables may allow us to better constrain the parameters of the transport models.
1 :  LANL - Los Alamos National Laboratory [Los Alamos]
2 :  National Superconducting Cyclotron Laboratory
3 :  GANIL - Grand Accélérateur National d'Ions Lourds
4 :  Department of Physics
5 :  Chemistry Department
Physique/Physique Nucléaire Expérimentale
projectile fragmentation – fragmentation reactions – fragmentation production cross section – level density – event generator
Lien vers le texte intégral : 
http://fr.arXiv.org/abs/0804.2603