Isospin-dependence of the charge-changing cross-section shaped by the charged-particle evaporation process
J. Zhao, B. Sun, I. Tanihata, S. Terashima, A. Prochazka, Jing Xu, Li Zhu, Jie Meng, Jun Su, Kaiyuan Zhang, Li‐Sheng Geng, L. C. He, Chia‐Yu Liu, Guang-Shuai Li, C.G. Lu, W.J. Lin, Weiping Lin, Zhong Liu, Panpan Ren, Z. Sun, F. Wang, Jing Wang, M. Wang, S. T. Wang, Xiu-Lin Wei, X. Xu, Juchen Zhang, Mingxing Zhang, Xinhui Zhang
Abstract
We present the charge-changing cross sections (CCCS) of 11−15C, 13−17N, and 15,17−18O 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.