Within the framework of Brueckner-Hartree-Fock method,the in-medium nucleonnucleon(NN)cross section is calculated.We base our investigation on a separable Paris potential for the NN interaction and a continuous choice...Within the framework of Brueckner-Hartree-Fock method,the in-medium nucleonnucleon(NN)cross section is calculated.We base our investigation on a separable Paris potential for the NN interaction and a continuous choice for the single particle spectrum.It is found that the in-medium cross section is strongly modified by medium effect.In particular,with increasing of nuclear density,the cross sections decrease.This indicates a proper treatment of the density dependence of the in-medium NN cross sections is important.展开更多
The strange hadronic matter with nucleon,Λ-hyperon andΞ-hyperon is studied by using a chiral symmetry model in a mean-field approximation.The saturation properties and stabilities of the strange hadronic matter are ...The strange hadronic matter with nucleon,Λ-hyperon andΞ-hyperon is studied by using a chiral symmetry model in a mean-field approximation.The saturation properties and stabilities of the strange hadronic matter are discussed.The result indicates a quite large strangeness fraction(fs)region where the strange hadronic matter is stable against particle emission.In the large fs region,theΞcomponent dominates,resulting in a deep minimum in the curve of the binding energy per baryon EB versus the strangeness fraction fs with(EB,fs)~_(-26.0MeV,1.23).展开更多
基金Supported in part by the National Natural Science Foundation of ChinaShanghai Natural Science Foundationthe Grant LWTZ-1298 of Chinese Academy of Sciences。
文摘Within the framework of Brueckner-Hartree-Fock method,the in-medium nucleonnucleon(NN)cross section is calculated.We base our investigation on a separable Paris potential for the NN interaction and a continuous choice for the single particle spectrum.It is found that the in-medium cross section is strongly modified by medium effect.In particular,with increasing of nuclear density,the cross sections decrease.This indicates a proper treatment of the density dependence of the in-medium NN cross sections is important.
基金Supported in part py the National Natural Science Foundation of China under Grant Nos.10075071 and 19975010the Foundation of Education Ministry of China,and Chinese Academy of Sciences under contract No.KJ951-A1-410.
文摘The strange hadronic matter with nucleon,Λ-hyperon andΞ-hyperon is studied by using a chiral symmetry model in a mean-field approximation.The saturation properties and stabilities of the strange hadronic matter are discussed.The result indicates a quite large strangeness fraction(fs)region where the strange hadronic matter is stable against particle emission.In the large fs region,theΞcomponent dominates,resulting in a deep minimum in the curve of the binding energy per baryon EB versus the strangeness fraction fs with(EB,fs)~_(-26.0MeV,1.23).
