1. Multiple-models prediction for light neutron-rich isotopes cross section by $Q_g$ systematics in $^{40}$Ar projectile fragmentation reactions
- Author
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Wei, X. B., Wei, H. L., Ma, C. W., Qiao, C. Y., Guo, Y. F., Pu, J., Cheng, K. X., Wang, Y. T., Wang, Z. X., Zhou, T. R., Peng, D., Wang, S. T., Tang, S. W., Yu, Y. H., Zhang, X. H., Sun, Y. Z., Jin, S. Y., Zhang, G. L., Jiang, X., Li, Z. Y., Xu, Y. F., Lu, F. H., and Liu, T. Q.
- Subjects
Nuclear Theory ,Nuclear Experiment - Abstract
Precise predictions for nuclei near drip lines are crucial for experiments in new generation of rare isotope facilities. A multi-models investigation of the $Q_g$ systematics for fragments production cross sections, with $Q_g$ defined as the difference of mass excess (ME) between the projectile ($Z_{p}, A_{p}$) and the fragment ($Z_{f}, A_{f}$) nuclei $Q_{g}=ME(Z_{p}, A_{p})-ME(Z_{f}, A_{f})$, has been performed to verify the model prediction abilities for light neutron-rich isotopes in measured $^{40}$Ar + $^9$Be projectile fragmentation reactions from 57$A$ MeV to 1$A$ GeV. The models used are the FRACS parametrizations and the newly developed Bayesian neural networks (BNN) model. %method The results show that FRACS, BNN, and $Q_g$ extrapolations are generally consistent, except for fragments near the nuclear mass of the projectile. Additionally, both measured data and model extrapolations provide evidence for a shell closure at $N=$ 16 in fluorine and neon, as well as the disappearance of the traditional magic number $N=$ 20 in neon, sodium and magnesium.
- Published
- 2024