with 28Si target and the possible relavent mechanisms

The reaction cross sections of 27,28P and the corresponding isotones on Si target were measured at intermediate energies. The measured reaction cross sections of the N = 12 and 13 isotones show an abrupt increase at Z = 15. The experimental results for the isotones with Z ≤ 14 as well as 28P can be well described by the modified Glauber theory of the optical limit approach. The enhancement of the reaction cross section for 28P could be explained in the modified Glauber theory with an enlarged core. Theoretical analysis with the modified Glauber theory of the optical limit and few-body approaches underpredicted the experimental data of 27P. Our theoretical analysis shows that an enlarged core together with proton halo are probably the mechanism responsible for the enhancement of the cross sections for the reaction of 27P+28Si.