The isobaric yield ratio difference between two reactions is found to equal μ 21 /T , which denotes the ratio of the difference between the neutron and proton chemical potentials to the temperature. A series of projectile fragmentation reactions induced by calcium isotopes are calculated using a modified statistical abrasion-ablation model, assuming the neutron density distribution to be the Fermi type. The μ 21 /T from the prefragments are found to be sensitive to the difference between the neutron density distributions of projectiles, while μ 21 /T from the final fragments are very similar for the reactions and insensitive to the difference between the neutron density distributions of projectiles. The μ 21 /T from the prefragments and final fragments verify that the deexcitation modifies the results largely.
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