Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2009-07-26
Phys.Rev.C81:014605,2010
Physics
Nuclear Physics
Nuclear Theory
31 pages, 12 figures. Revised version accepted for publication in Phys. Rev. C
Scientific paper
10.1103/PhysRevC.81.014605
We have investigated the influence of different non-linear relativistic mean field models ($NL$, $NL\rho$ and $NL\rho\delta$) on spallation neutrons for p+Fe and Pb reactions at 0.8, 1.2 and 1.6 GeV by means of a relativistic Boltzmann Uehling Uhlenbeck (RBUU) approach plus a statistical multifragmentation (SM) decay model. We find that the "evaporation shoulder", i.e. the neutron energy spectrum from 3 to 30 MeV, almost for any emission angle is quite sensitive to the isospin part of the mean field. For the more neutron-rich Pb-target the evaporation component can be directly related to the low density behavior on the symmetry energy in the thermal expansion phase of the excited compound system. It turns out that the spallation data for the reactions under study are shown to be more consistent with RBUU+SM employing the $NL\rho$ effective lagrangian.
Abdel-Waged Khaled
Felemban Nuha
Ferini Graziella
Gaitanos Theodoros
Toro Massimo Di
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