The formalism for a quantitative treatment of high-momentum components of NN momentum distributions for the spin-singlet channels is presented.This approach suggests that the use of a distribution for a virtual state ...The formalism for a quantitative treatment of high-momentum components of NN momentum distributions for the spin-singlet channels is presented.This approach suggests that the use of a distribution for a virtual state in momentum representation for the NN channel in question is a universal one,which can be further employed within contact formalisms for nuclei.It is shown how such distributions can be calculated from low-energy scattering wave functions in the same channels.As a result,a new characteristic(a constant)for the high-momentum part of the momentum distribution in a spin-singlet channel is introduced.To test the approach,we calculate the pp nuclear contacts for the^(3)He,nucleus which appear to be nearly the same for four realistic NN interactions with essentially different high-momentum properties.The results should be useful for researchers studying the problem of shortrange correlations in nuclei.In particular,the approach gives a generalization for the formalisms based on nuclear contacts.展开更多
The dibaryon concept for nuclear force is presented,assuming that the attraction between nucleons at medium distances is mainly due to the s-channel exchange of an intermediate six-quark(dibaryon)state.To construct th...The dibaryon concept for nuclear force is presented,assuming that the attraction between nucleons at medium distances is mainly due to the s-channel exchange of an intermediate six-quark(dibaryon)state.To construct the respective NN interaction model,a microscopic six-quark description of the NN system is used,in which symmetry aspects play a special role.It is shown that the NN interaction in all important partial waves can be described by the superposition of long-range t-channel one-pion exchange and s-channel exchange by an intermediate dibaryon.The model developed in this study provides a good description of both elastic phase shifts and inelasticities of NN scattering in all S,P,D,and F partial waves at energies from zero to 600-800 MeV and even higher.The parameters of the intermediate six-quark states,corresponding to the best fit of NN scattering data,are found to be consistent with the parameters of the known dibaryon resonances in those NN partial configurations,where their existence has been experimentally confirmed.Predictions for new dibaryon states are given as well.展开更多
文摘The formalism for a quantitative treatment of high-momentum components of NN momentum distributions for the spin-singlet channels is presented.This approach suggests that the use of a distribution for a virtual state in momentum representation for the NN channel in question is a universal one,which can be further employed within contact formalisms for nuclei.It is shown how such distributions can be calculated from low-energy scattering wave functions in the same channels.As a result,a new characteristic(a constant)for the high-momentum part of the momentum distribution in a spin-singlet channel is introduced.To test the approach,we calculate the pp nuclear contacts for the^(3)He,nucleus which appear to be nearly the same for four realistic NN interactions with essentially different high-momentum properties.The results should be useful for researchers studying the problem of shortrange correlations in nuclei.In particular,the approach gives a generalization for the formalisms based on nuclear contacts.
基金partially supported by RFBR,grants Nos.19-02-00011 and 19-02-00014support from the Foundation for the Advancement of Theoretical Physics and Mathematics“BASIS”。
文摘The dibaryon concept for nuclear force is presented,assuming that the attraction between nucleons at medium distances is mainly due to the s-channel exchange of an intermediate six-quark(dibaryon)state.To construct the respective NN interaction model,a microscopic six-quark description of the NN system is used,in which symmetry aspects play a special role.It is shown that the NN interaction in all important partial waves can be described by the superposition of long-range t-channel one-pion exchange and s-channel exchange by an intermediate dibaryon.The model developed in this study provides a good description of both elastic phase shifts and inelasticities of NN scattering in all S,P,D,and F partial waves at energies from zero to 600-800 MeV and even higher.The parameters of the intermediate six-quark states,corresponding to the best fit of NN scattering data,are found to be consistent with the parameters of the known dibaryon resonances in those NN partial configurations,where their existence has been experimentally confirmed.Predictions for new dibaryon states are given as well.
