Isospin-dependence of the charge-changing cross-section shaped by the charged-particle evaporation process

J. W. Zhao, B. -H. Sun, I. Tanihata, S. Terashima, A. Prochazka, J. Y. Xu, L. H. Zhu, J. Meng, J. Su, K. Y. Zhang, L. S. Geng, L. C. He, C. Y. Liu, G. S. Li, C. G. Lu, W. J. Lin, W. P. Lin, Z. Liu, P. P Ren, Z. Y. Sun, F. Wang, J. Wang, M. Wang, S. T. Wang, X. L. Wei, X. D. Xu, J. C. Zhang, M. X Zhang, X. H. Zhang
Nuclear Experiment, Nuclear Experiment (nucl-ex), Nuclear Theory (nucl-th)
Phys. Lett. B 847 (2023) 138269
2023-10-20 16:00:00
We present the charge-changing cross sections (CCCS) of $^{11-15}$C, $^{13-17}$N, and $^{15,17-18}$O at around 300 MeV/nucleon on a carbon target, which extends to $p$-shell isotopes with $N < Z$ for the first time. The Glauber model, which considers only the proton distribution of projectile nuclei, underestimates the cross sections by more than 10\%. We show that this discrepancy can be resolved by considering the contribution from the charged-particle evaporation process (CPEP) following projectile neutron removal. Using nucleon densities from the deformed relativistic Hartree-Bogoliubov theory in continuum, we investigate the isospin-dependent CPEP contribution to the CCCS for a wide range of neutron-to-proton separation energy asymmetry. Our calculations, which include the CPEP contribution, agree well with existing systematic data and reveal an ``evaporation peak" at the isospin symmetric region where the neutron-to-proton separation energy is close to zero. These results suggest that analysis beyond the Glauber model is crucial for accurately determining nuclear charge radii from CCCSs.
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