Precise predictions for nuclei near drip lines are crucial for experiments in new generation of rare isotope facilities. A multi-models investigation of the Qg systematics for fragments production cross sections, with Qg defined as the difference of mass excess (ME) between the projectile (Zp,Ap) and the fragment (Zf,Af) nuclei Qg=ME(Zp,Ap)−ME(Zf,Af), has been performed to verify the model prediction abilities for light neutron-rich isotopes in measured 40Ar + 9Be projectile fragmentation reactions from 57A MeV to 1A 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 Qg 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.
@article{arxiv.2409.09367,
title = {Multiple-models prediction for light neutron-rich isotopes cross section by $Q_g$ systematics in $^{40}$Ar projectile fragmentation reactions},
author = {X. B. Wei and H. L. Wei and C. W. Ma and C. Y. Qiao and Y. F. Guo and J. Pu and K. X. Cheng and Y. T. Wang and Z. X. Wang and T. R. Zhou and D. Peng and S. T. Wang and S. W. Tang and Y. H. Yu and X. H. Zhang and Y. Z. Sun and S. Y. Jin and G. L. Zhang and X. Jiang and Z. Y. Li and Y. F. Xu and F. H. Lu and T. Q. Liu},
journal= {arXiv preprint arXiv:2409.09367},
year = {2024}
}