Isospin-dependence of the charge-changing cross-section shaped by the charged-particle evaporation process
oleh: 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
| Format: | Article |
|---|---|
| Diterbitkan: | Elsevier 2023-12-01 |
Deskripsi
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.