학술논문
Isospin-dependence of the charge-changing cross-section shaped by the charged-particle evaporation process
Document Type
Working Paper
Author
Zhao, J. W.; Sun, B. -H.; Tanihata, I.; Terashima, S.; Prochazka, A.; Xu, J. Y.; Zhu, L. H.; Meng, J.; Su, J.; Zhang, K. Y.; Geng, L. S.; He, L. C.; Liu, C. Y.; Li, G. S.; Lu, C. G.; Lin, W. J.; Lin, W. P.; Liu, Z.; Ren, P. P; Sun, Z. Y.; Wang, F.; Wang, J.; Wang, M.; Wang, S. T.; Wei, X. L.; Xu, X. D.; Zhang, J. C.; Zhang, M. X; Zhang, X. H.
Source
Phys. Lett. B 847 (2023) 138269
Subject
Language
Abstract
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.
Comment: 5 figures
Comment: 5 figures