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Daniela Henzlova GSI-Darmstadt, Germany NSCL-MSU, East Lansing, Michigan

Comparison of the isotopic distributions measured in the fragmentation of 136 Xe and 124 Xe projectiles with the EPAX parameterization. Daniela Henzlova GSI-Darmstadt, Germany NSCL-MSU, East Lansing, Michigan. Overview of the measured cross sections.

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Daniela Henzlova GSI-Darmstadt, Germany NSCL-MSU, East Lansing, Michigan

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  1. Comparison of the isotopic distributions measured in the fragmentation of 136Xe and 124Xe projectiles with the EPAX parameterization Daniela Henzlova GSI-Darmstadt, Germany NSCL-MSU, East Lansing, Michigan

  2. Overview of the measured cross sections • more than 1100 production cross sections over 4 orders of magnitude • broad nuclear charge range Z=3(5)-56(55) for 136Xe(124Xe) • extensive database for comparison with up-to-date parameterizations • EPAX2 - based on fragmentation reactions of medium to heavy-mass projectiles in relativistic heavy-ion collisions

  3. Isotopic resolution of FRS 124Xe 136Xe N=Z+k, k=4 136Xe + Pb 1A GeV Z=50 Z=54 • final fragments in broad range unambiguously identified

  4. Overview of the isotopic distributions • 136Xe+Pb 1 A GeV • 124Xe+Pb 1 A GeV

  5. Comparison with EPAX – lower Z • 124Xe+Pb 1 A GeV EPAX for 124Xe+Pb • 136Xe+Pb 1 A GeV EPAX for 136Xe+Pb • underestimation of production cross sections of lighter isotopes

  6. Comparison with EPAX – higher Z • 124Xe+Pb 1 A GeV EPAX for 124Xe+Pb • 136Xe+Pb 1 A GeV EPAX for 136Xe+Pb • underestimation of cross sections of isotopes on the less n-rich side of the isotopic distributions in case of 136Xe projectile • slightly worse agreement with data from more n-rich projectile

  7. Comparison with EPAX2 – available data J. Friese et al., Nucl. Phys. A 553 (1993) 753c R. Schneider, PhD thesis, TU München (1996); Zeit. für Phys. A 348 (1994) 241 J. Reinhold et al., Phys. Rev. C 58 (1998) 247 this work • scarce experimental data for n-rich Xe isotope available

  8. Comparison with EPAX – mean N-over-Z 136Xe • 136Xe+Pb 1 A GeV • 124Xe+Pb 1 A GeV EPAX for 136Xe+Pb EPAX for 124Xe+Pb 124Xe • higher <N>/Z in the vicinity of the 136Xe projectile • low values of <N>/Z of the residues far from both projectiles

  9. Comparison with EPAX – mass distributions • 136Xe+Pb 1 A GeV EPAX for 136Xe+Pb • 124Xe+Pb 1 A GeV EPAX for 124Xe+Pb • mass yields for both systems considerably underestimated

  10. Summary • strong underestimation of lighter residues production cross sections independently of system isospin • underestimation of less n-rich isotopes for residues in the vicinity of 136Xe projectile • overall 136Xe data worse reproduced • too strong loss of memory on initial N/Z • underestimation of mass yields for both Xe projectiles present data may serve to refine the EPAX formulation

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