The K<SUP>+</SUP> scattering cross section with the in-medium virtual pion is evaluated in the lowest-order chiral perturbation theory with the density-dependent pion decay constant and mass. The contribut...The K<SUP>+</SUP> scattering cross section with the in-medium virtual pion is evaluated in the lowest-order chiral perturbation theory with the density-dependent pion decay constant and mass. The contribution of nuclear pions to the total K<SUP>+</SUP>-nucleus cross section is found to be about 5% and 12% when the excess pion numbers per nucleon n<SUB>?</SUB> = 0.057 and 0.13 are used. The inclusion of the off-mass-shell behavior of the K<SUP>+</SUP>? amplitude produced a significant improvement in the K<SUP>+</SUP>-nucleus cross section.展开更多
A new set of global phenomenological optical model potential parameters has been obtained for helium-3 projectile, by simultaneously fitting the experimental data of helium-3 total reaction cross sections and elastic ...A new set of global phenomenological optical model potential parameters has been obtained for helium-3 projectile, by simultaneously fitting the experimental data of helium-3 total reaction cross sections and elastic scattering angular distributions in the mass range of target nuclei 20〈〈A〈209 at incident energies below 250 MeV. A comparison has been made between the extracted helium-3 global optical model potential parameters and the existing ones. The calculated results of total reaction cross sections and elastic scattering angular distributions are also agreement. compared with experimental data with their satisfactory展开更多
文摘The K<SUP>+</SUP> scattering cross section with the in-medium virtual pion is evaluated in the lowest-order chiral perturbation theory with the density-dependent pion decay constant and mass. The contribution of nuclear pions to the total K<SUP>+</SUP>-nucleus cross section is found to be about 5% and 12% when the excess pion numbers per nucleon n<SUB>?</SUB> = 0.057 and 0.13 are used. The inclusion of the off-mass-shell behavior of the K<SUP>+</SUP>? amplitude produced a significant improvement in the K<SUP>+</SUP>-nucleus cross section.
基金supported by the National Natural Science Foundation of China (Grant No. 11175260)China Ministry of Science and Technology (Grant No. 2007CB209903)
文摘A new set of global phenomenological optical model potential parameters has been obtained for helium-3 projectile, by simultaneously fitting the experimental data of helium-3 total reaction cross sections and elastic scattering angular distributions in the mass range of target nuclei 20〈〈A〈209 at incident energies below 250 MeV. A comparison has been made between the extracted helium-3 global optical model potential parameters and the existing ones. The calculated results of total reaction cross sections and elastic scattering angular distributions are also agreement. compared with experimental data with their satisfactory
