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Predictions from several models for the cross sections of light neutron-rich isotopes by Qg systematics in Ar40 projectile-fragmentation reactions

Xiao-Bao Wei1,2, Hui-Ling Wei1,*, Chun-Wang Ma3,†, Chun-Yuan Qiao1, Ya-Fei Guo1, Jie Pu1, Kai-Xuan Cheng1, Yu-Ting Wang1, Zeng-Xiang Wang1,2 et al.

Tian-Ren Zhuo1, Dan Peng4, Shi-Tao Wang2,5, Shu-Wen Tang2,5, Yu-Hong Yu2,5, Xue-Heng Zhang2,5, Ya-Zhou Sun2, Shu-Ya Jin2, Guo-Li Zhang2,5, Xuan Jiang2,5, Zhi-Yao Li2,5, Ying-Feng Xu2, Fen-Hua Lu2, and Tuo-Qi Liu2

  • *Contact author: htuwhling@126.com
  • †Contact author: machunwang@126.com
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Phys. Rev. C 111, 034607 – Published 10 March, 2025

DOI: https://doi.org/10.1103/PhysRevC.111.034607

Abstract

Accurate prediction of isotope production near the neutron and proton drip lines is critical for optimizing experimental designs in new rare isotope beam facilities. This study presents a systematic multimodel comparison of Qg systematics for fragment production cross sections, where Qg represents the mass excess difference between the projectile nucleus (Zp,Ap) and the fragment nucleus (Zf,Af), that is, Qg=ME(Zp,Ap)−ME(Zf,Af). The investigation evaluates the predictive capabilities of the model for light neutron-rich isotopes through the analysis of Ar40+9Be projectile fragmentation reactions within an extensive energy range from 57A MeV to 1A GeV. The models used are the FRACS parametrizations and the newly developed Bayesian neural network (BNN) model. The results demonstrate generally consistent extrapolation trends among the FRACS predictions, the BNN calculations, and the Qg systematics, with discrepancies primarily observed for fragments approaching the projectile mass. Experimental measurements combined with theoretical extrapolations reveal compelling evidence for N=16 shell closure in fluorine and neon, concurrent with the disappearance of the conventional magic number N=20 in neutron-rich neon, sodium, and magnesium isotopes.

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Phys. Rev. C 111, 034607– Published 10 March, 2025
  • Received 9 September 2024
  • Revised 5 January 2025
  • Accepted 26 February 2025
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