Isospin dependence of the isotopic distributions from 36Ar and 40Ar fragmentation at about 60 MeV/nucleon

Systematic study of isoscaling behavior in projectile fragmentation by the statistical abrasion–ablation model

“…From this figure, we can see that the SAA model can reproduce the experimental data both at intermediate and high energies quite well. The isospin effect and its disappearance in projectile fragmentation for 36,40 Ar at intermediate energies have been predicted by this model and confirmed by the experimental data [19].…”

“…After the evaporation stage, we can obtain the final fragments which are comparable to the experimental data. By introducing an in-medium nucleon-nucleon cross section and optimizing the computational method given in [18,19,36,37], it can give a good agreement with the experimental isotopic distributions [18,19,37]. The comparison of the SAA model calculations with the experimental isotopic distributions for Z = 30-32 from 44 A MeV 86 Kr + 27 Al [38] and Z = 43-45 from 790 A MeV 129 Xe + 27 Al [39] is shown in figure 1.…”

“…The model predicts that a strong isospin effect exists in the isotopic distributions produced by projectiles with same charge number but different mass number [18,19]. In order to do a systematic study of the isospin effect in projectile fragmentation, reactions of 40/36 27 Al (lower panel).…”

“…Our previous calculations by using the modified statistical abrasion-ablation (SAA) model have demonstrated that the fragment isotopic distribution shifts toward the neutron-rich side for a neutron-rich projectile, but the shift decreases with the increase of the parameter (Z proj − Z)/Z proj or the violence of nuclear reaction. This isospin effect of fragmentation reaction on the fragment isotopic distribution will disappear when (Z proj − Z)/Z proj becomes larger than 0.5 [18,19].…”

Systematic behavior in the isospin dependence of projectile fragmentation of mirror nuclei withA= 20–60

“…The SAA model is one method to estimate the cross sections of fragments produced in projectile fragmentation. It was developed by Brohm and Schmidt to describe the peripheral nuclear collisions at high energy [25] and was modified by Fang and Zhong et al to study the projectile fragmentation at intermediate energies [13,[26][27][28][29][30][31]. In [14] and [23], the SAA model has reproduced the cross sections of fragments produced in the 140 A MeV 40,48 Ca+ 9 Be and 58,64 Ni + 9 Be experimental data well.…”