As a crucial ingredient of the nucleon-nucleon(NN)interaction,the tensor force has an important impact on the structural and dynamical properties of the nuclear many-body system,particularly the properties of exotic n...As a crucial ingredient of the nucleon-nucleon(NN)interaction,the tensor force has an important impact on the structural and dynamical properties of the nuclear many-body system,particularly the properties of exotic nuclei far away from the stability,which are crucial for understanding the nucleosynthesis in nuclear astrophysics.Many efforts have been devoted to studying the influence of the tensor force in the effective NN interaction in the nuclear medium within the configuration interaction shell model[1]and the density functional theories(DFTs)[2].Due to the difference of modeling the effective NN interaction and the difficulty of determining the tensor-force strengths in finite nuclei,the tensorforce effects in nuclear physics still need to be fully settled.展开更多
The microscopic mechanisms of the symmetry energy in nuclear matter are investigated in the framework of the relativistic Brueckner-Hartree-Fock(RBHF)model with a high-precision realistic nuclear potential,pvCDBonn A....The microscopic mechanisms of the symmetry energy in nuclear matter are investigated in the framework of the relativistic Brueckner-Hartree-Fock(RBHF)model with a high-precision realistic nuclear potential,pvCDBonn A.The kinetic energy and potential contributions to symmetry energy are decomposed.They are explicitly expressed by the nucleon self-energies,which are obtained through projecting the G-matrices from the RBHF model into the terms of Lorentz covariants.The nuclear medium effects on the nucleon self-energy and nucleon-nucleon interaction in symmetry energy are discussed by comparing the results from the RBHF model and those from Hartree-Fock and relativistic Hartree-Fock models.It is found that the nucleon self-energy including the nuclear medium effect on the single-nucleon wave function provides a largely positive contribution to the symmetry energy,while the nuclear medium effect on the nucleon-nucleon interaction,i.e.,the effective G-matrices provides a negative contribution.The tensor force plays an essential role in the symmetry energy around the density.The scalar and vector covariant amplitudes of nucleon-nucleon interaction dominate the potential component of the symmetry energy.Furthermore,the isoscalar and isovector terms in the optical potential are extracted from the RBHF model.The isoscalar part is consistent with the results from the analysis of global optical potential,while the isovector one has obvious differences at higher incident energy due to the relativistic effect.展开更多
In order to use high-precision realistic nucleon-nucleon(NN) potentials in relativistic many-body problems,new versions of the charge-dependent Bonn(CD-Bonn) NN potential are constructed with pseudovector pionnucleon ...In order to use high-precision realistic nucleon-nucleon(NN) potentials in relativistic many-body problems,new versions of the charge-dependent Bonn(CD-Bonn) NN potential are constructed with pseudovector pionnucleon coupling,instead of pseudoscalar coupling used in the original CD-Bonn potential as given by Machleidt2).To describe precisely the charge dependence in the NN scattering data,two effective scalar mesons are introduced,whose coupling constants with nucleons are independently determined for each partial wave and for the total angular momentum J≤4.The coupling constants between the vector and pseudovector mesons and a nucleon are identical in all channels.Three revised CD-Bonn potentials with the pseudovector pion-nucleon coupling(pvCD-Bonn) are generated by fitting the Nijmegen PWA phase shift data and the deuteron binding energy with different pion-nucleon coupling strengths.The potentials reproduce the phase shifts in the spin-single channels and the low-energy NN scattering parameters very well,but result in significantly different mixing parameters in the spin-triplet channels.The Dstate probabilities for the deuteron range from 4.22% to 6.05%,demonstrating that the potentials contain different components of the tensor force,which is useful when considering the role of the tensor force in nuclear few-and many-body systems.展开更多
基金supported by the National Natural Science Foundation of China(12205030,12347101,11935003,11975031,11875075,12070131001,and 12047564)the National Key R&D Program of China(2017YFE0116700,and 2018YFA0404400)+2 种基金the Fundamental Research Funds for the Central Universities(2020CDJQY-Z003,and 2021CDJZYJH-003)the MOST-RIKEN Joint Project"Ab initio investigation in nuclear physics",the Institute for Basic Science(IBS-R031-D1)the Deutsche Forschungsgemeinschaft(DFG,German Research Foundation)under Germany’s Excellence Strategy(EXC-2094-390783311),ORIGINS。
文摘As a crucial ingredient of the nucleon-nucleon(NN)interaction,the tensor force has an important impact on the structural and dynamical properties of the nuclear many-body system,particularly the properties of exotic nuclei far away from the stability,which are crucial for understanding the nucleosynthesis in nuclear astrophysics.Many efforts have been devoted to studying the influence of the tensor force in the effective NN interaction in the nuclear medium within the configuration interaction shell model[1]and the density functional theories(DFTs)[2].Due to the difference of modeling the effective NN interaction and the difficulty of determining the tensor-force strengths in finite nuclei,the tensorforce effects in nuclear physics still need to be fully settled.
基金Supported by in part by the National Natural Science Foundation of China(11775119,12175109)the Natural Science Foundation of Tianjin。
文摘The microscopic mechanisms of the symmetry energy in nuclear matter are investigated in the framework of the relativistic Brueckner-Hartree-Fock(RBHF)model with a high-precision realistic nuclear potential,pvCDBonn A.The kinetic energy and potential contributions to symmetry energy are decomposed.They are explicitly expressed by the nucleon self-energies,which are obtained through projecting the G-matrices from the RBHF model into the terms of Lorentz covariants.The nuclear medium effects on the nucleon self-energy and nucleon-nucleon interaction in symmetry energy are discussed by comparing the results from the RBHF model and those from Hartree-Fock and relativistic Hartree-Fock models.It is found that the nucleon self-energy including the nuclear medium effect on the single-nucleon wave function provides a largely positive contribution to the symmetry energy,while the nuclear medium effect on the nucleon-nucleon interaction,i.e.,the effective G-matrices provides a negative contribution.The tensor force plays an essential role in the symmetry energy around the density.The scalar and vector covariant amplitudes of nucleon-nucleon interaction dominate the potential component of the symmetry energy.Furthermore,the isoscalar and isovector terms in the optical potential are extracted from the RBHF model.The isoscalar part is consistent with the results from the analysis of global optical potential,while the isovector one has obvious differences at higher incident energy due to the relativistic effect.
基金Supported by National Natural Science Foundation of China(11775119,11405116,11675083)
文摘In order to use high-precision realistic nucleon-nucleon(NN) potentials in relativistic many-body problems,new versions of the charge-dependent Bonn(CD-Bonn) NN potential are constructed with pseudovector pionnucleon coupling,instead of pseudoscalar coupling used in the original CD-Bonn potential as given by Machleidt2).To describe precisely the charge dependence in the NN scattering data,two effective scalar mesons are introduced,whose coupling constants with nucleons are independently determined for each partial wave and for the total angular momentum J≤4.The coupling constants between the vector and pseudovector mesons and a nucleon are identical in all channels.Three revised CD-Bonn potentials with the pseudovector pion-nucleon coupling(pvCD-Bonn) are generated by fitting the Nijmegen PWA phase shift data and the deuteron binding energy with different pion-nucleon coupling strengths.The potentials reproduce the phase shifts in the spin-single channels and the low-energy NN scattering parameters very well,but result in significantly different mixing parameters in the spin-triplet channels.The Dstate probabilities for the deuteron range from 4.22% to 6.05%,demonstrating that the potentials contain different components of the tensor force,which is useful when considering the role of the tensor force in nuclear few-and many-body systems.
