Charge correlations and isotopic distributions of projectile fragmentation events inXe124+Sn112atE/A=50MeV
| Autor: | René Roy, J. Black, R. T. de Souza, Michael Famiano, S. Bianchin, C.J. Metelko, M. O. Frégeau, A. Chbihi, A. B. McIntosh, J. Moisan, J. Gauthier, C. Schwarz, W. Trautmann, D. Mercier, R. Yanez, Sylvie Hudan, A. S. Botvina |
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| Rok vydání: | 2009 |
| Předmět: |
Physics
Nuclear and High Energy Physics 010308 nuclear & particles physics Nuclear Theory Charge (physics) Nuclear matter 01 natural sciences Symmetry (physics) Nuclear physics Excited state 0103 physical sciences Atomic physics Nuclear Experiment 010306 general physics Spin (physics) Ternary operation Energy (signal processing) Excitation |
| Zdroj: | Physical Review C. 80 |
| ISSN: | 1089-490X 0556-2813 |
| DOI: | 10.1103/physrevc.80.064611 |
| Popis: | Ternary breakup of an excited projectile-like fragment produced in mid-peripheral collisions of $^{124}\mathrm{Xe}$ projectiles with $^{112}\mathrm{Sn}$ nuclei at $E/A=50$ MeV is examined. Charge correlations reveal that symmetric breakups occur with significant probability. By selecting on the parallel velocity of the heaviest fragment we minimize the entrance channel dynamics. Calculations with the statistical decay code GEMINI failed to reproduce the experimental charge correlations for any suitable combination of excitation energy and spin considered. A statistical multifragmentation model (SMM) in which breakup of low-density nuclear matter is assumed was able to reproduce the observed charge correlations. The $\ensuremath{\langle}N\ensuremath{\rangle}/Z$ and isotope distributions of fragments were compared to the results of the SMM calculations. Describing the $\ensuremath{\langle}N\ensuremath{\rangle}/Z$ of heavy fragments ($Zg6$) within SMM suggests that a reduction of the symmetry energy parameter from $\ensuremath{\gamma}=25$ to $14$ MeV is necessary. We observe that the yield of neutron-rich isotopes of heavy fragments is particularly sensitive to the symmetry energy. |
| Databáze: | OpenAIRE |
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