Obvious enhancement of the total reaction cross sections for ${}^{27,28}$P with ${}^{28}$Si target and the possible relavent mechanisms

Abstract

The reaction cross sections of ${}^{27,28}$P 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 . The experimental results for the isotones with $Z\le 14$ as well as P can be well described by the modified Glauber theory of the optical limit approach. The enhancement of the reaction cross section for ${}^{28}$P 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 ${}^{27}$P. 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 ${}^{27}$P+${}^{28}$Si.

16 pages, 5 figures, to be published in Phys.Rev.C