C. W. Ma, H. L. Wei, Y. G. Ma
The "finite-size" effects in isobaric yield ratio (IYR), which is shown in the standard grand-canonical and canonical statistical ensembles (SGC/CSE) method, is found to prevent obtaining the actual values of physical parameters. Due to there is no inputs of neutron and proton density distribution in SGC/CSE, the conclusion of SGC/CSE is doubtable. To investigate wether IYR has the "finite-size" effects, IYR of mirror nuclei are reexamined using a modified statistical abrasion-ablation model. IYR of mirror nuclei in the 140$A$ MeV $^{38\sim52}$Ca + $^{12}$C, and $^{72}$Zn/$^{96}$Zr/$^{120}$Sn + $^{12}$C reactions are calculated using a modified statistical abrasion-ablation model. IYR of mirror nucleus in reactions of $^{38\sim52}$Ca increases when the projectile becomes more neutron-rich, but saturates in the reactions of very neutron-rich nucleus. IYR of mirror nuclei in reactions of $^{72}$Zn/$^{96}$Zr/$^{120}$Sn that have same n/p ratio show no "finite-size" effects. IYR of mirror nuclei is found to depends on the isospin of the projectile rather than the size of reaction system.
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http://arxiv.org/abs/1207.0986
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