Multiple-models prediction for light neutron-rich isotopes cross section by Q_g systematics in ⁴⁰Ar projectile fragmentation reactions

2024/09/14 by Xiaobao Wei, Hui-Ling Wei, Wei, X. B. +43
Physics and Astronomy · Engineering · #Nuclear Physics and Applications #Nuclear physics research studies #Nuclear reactor physics and engineering

paper · pdf · doi:10.48550/arxiv.2409.09367

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 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 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.

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