  Isotope production cross sections from the 500 MeV p + 136Xe interactions
measured recently at GSI in inverse kinematics have been simulated with MCNP6
using the CEM03.03 event generator. MCNP6 reproduces reasonably well most of
the measured cross sections. However, the isotopes with a charge number greater
than the charge number on the target by two units is overestimated
significantly by CEM03.03. We found also an underestimation for the production
of isotopes in the deep spallation region, far from the target-nucleus. Further
investigations and further improvement of CEM03.03 with a possible
consideration of multifragmentation and fission-like binary decays are needed
in order to predict well products from intermediate- and high-energy nuclear
reactions far from the target-nuclei, in the deep spallation and fragmentation
regions
