基于有限程的Gogny相互作用,系统研究同位旋非对称核物质的状态方程(equation of state,EOS)及其单粒子势和它们的同位旋相关性.通过对比各类模型以及实验值,说明现有的D1,D1S和D1N这3组Gogny参数的不足之处,指出探寻新的Gogny核力参数...基于有限程的Gogny相互作用,系统研究同位旋非对称核物质的状态方程(equation of state,EOS)及其单粒子势和它们的同位旋相关性.通过对比各类模型以及实验值,说明现有的D1,D1S和D1N这3组Gogny参数的不足之处,指出探寻新的Gogny核力参数的必要性.展开更多
本文利用相对论准粒子无规相位近似(Quasiparticle Random Phase Approximation,QRPA)模型研究了高斯型同位旋标量对力对原子核^(42)Ca中β−方向的伽莫夫-泰勒(Gamow-Teller,GT)和自旋-偶极(Spin-dipole,SD)跃迁的影响。结果表明:同位...本文利用相对论准粒子无规相位近似(Quasiparticle Random Phase Approximation,QRPA)模型研究了高斯型同位旋标量对力对原子核^(42)Ca中β−方向的伽莫夫-泰勒(Gamow-Teller,GT)和自旋-偶极(Spin-dipole,SD)跃迁的影响。结果表明:同位旋标量对力对于恢复SU(4)对称性从而重现实验上42Ca的低能量超级GT态至关重要。同位旋标量对力会使自旋反转的跃迁组分混合进入低能量GT态,从而增强低能量GT态的集体性,极大地增加其跃迁强度。同时,由于同位旋标量对力具有吸引性质,会减小低能量GT态的激发能。对于SD跃迁,同位旋标量对力对其激发能和跃迁强度的影响均不明显。展开更多
An improved isospin dependent Boltzmann Langevin model,in which the inelastic channels and momentum dependent interactions are incorporated,is used to investigate the high-density behavior of nuclear symmetry energy.B...An improved isospin dependent Boltzmann Langevin model,in which the inelastic channels and momentum dependent interactions are incorporated,is used to investigate the high-density behavior of nuclear symmetry energy.By taking several forms of nuclear symmetry energy,we calculate the time evolutions of neutron over proton ratio,π multiplicity and π-/π+ ratio,and the kinetic energy and transverse momentum spectra of π-/π+ ratio in the heavy ion collisions at 400A MeV.It is found that the neutron over proton ratio and π-/π+ ratio are very sensitive to the nuclear symmetry energy,and the π-is more sensitive to the nuclear symmetry energy than the π+.A supersoft symmetry energy results in a larger π-/π+ ratio.展开更多
This paper reports my recent study[1]on the shear viscosity of neutron-rich nuclear matter from a relaxation time approach.An isospin- and momentum-dependent interaction is used in the study.Dependence of density,temp...This paper reports my recent study[1]on the shear viscosity of neutron-rich nuclear matter from a relaxation time approach.An isospin- and momentum-dependent interaction is used in the study.Dependence of density,temperature,and isospin asymmetry of nuclear matter on its shear viscosity have been discussed.Similar to the symmetry energy,the symmetry shear viscosity is defined and its density and temperature dependence are studied.展开更多
We studied the role that electron gas has on the formation of nuclear structures at subsaturation densities and low temperatures(T<1 Me V).Using a classical molecular dynamics model we studied isospin symmetric and...We studied the role that electron gas has on the formation of nuclear structures at subsaturation densities and low temperatures(T<1 Me V).Using a classical molecular dynamics model we studied isospin symmetric and asymmetric matter at subsaturation densities and low temperatures varying the Coulomb interaction strength.The effect of such variation was quantified on the fragment size multiplicity,the inter-particle distance,the isospin content of the clusters,the nucleon mobility and cluster persistence,and on the nuclear structure shapes.We found that the presence of an electron gas distributes matter more evenly,disrupts the formation of larger objects,reduces the isospin content,and modifies the nucleon average displacement,but does not affect the inter-nucleon distance in clusters.The nuclear structures are also found to change shapes by different degrees depending on their isospin content,temperature and density.展开更多
The hadron-quark phase transition is studied with the newly constructed Hadron-Poyakov-Nambu- Jona-Lasinio(PNJL) model.Particularly,in the description of quark matter,we include the isoscalar-vector interaction.With t...The hadron-quark phase transition is studied with the newly constructed Hadron-Poyakov-Nambu- Jona-Lasinio(PNJL) model.Particularly,in the description of quark matter,we include the isoscalar-vector interaction.With the constraints of neutron star observations,our calculation shows the isoscalar-vector interaction between quarks is indispensable if massive hybrids star exist in the universe.Its strength determines the onset density of quark matter,and the mass-radius relations of hybrid stars.Also,as a connection with heavy-ion-collision experiments,we discuss the strength of isoscalar-vector interaction and its effect on the signals of hadron-quark phase transition in heavy-ion collisions,such as NICA at JINR-Dubna and FAIR at GSI-Darmstadt.展开更多
文摘本文利用相对论准粒子无规相位近似(Quasiparticle Random Phase Approximation,QRPA)模型研究了高斯型同位旋标量对力对原子核^(42)Ca中β−方向的伽莫夫-泰勒(Gamow-Teller,GT)和自旋-偶极(Spin-dipole,SD)跃迁的影响。结果表明:同位旋标量对力对于恢复SU(4)对称性从而重现实验上42Ca的低能量超级GT态至关重要。同位旋标量对力会使自旋反转的跃迁组分混合进入低能量GT态,从而增强低能量GT态的集体性,极大地增加其跃迁强度。同时,由于同位旋标量对力具有吸引性质,会减小低能量GT态的激发能。对于SD跃迁,同位旋标量对力对其激发能和跃迁强度的影响均不明显。
基金Supported by National Natural Science Foundation of China(NSFC) projects (Nos.11025524 and 11161130520)National Basic Research Program of China(No.2010CB832903)
文摘An improved isospin dependent Boltzmann Langevin model,in which the inelastic channels and momentum dependent interactions are incorporated,is used to investigate the high-density behavior of nuclear symmetry energy.By taking several forms of nuclear symmetry energy,we calculate the time evolutions of neutron over proton ratio,π multiplicity and π-/π+ ratio,and the kinetic energy and transverse momentum spectra of π-/π+ ratio in the heavy ion collisions at 400A MeV.It is found that the neutron over proton ratio and π-/π+ ratio are very sensitive to the nuclear symmetry energy,and the π-is more sensitive to the nuclear symmetry energy than the π+.A supersoft symmetry energy results in a larger π-/π+ ratio.
基金Suppprted by "100-talent plan" of Shanghai Institute of Applied Physics from the Chinese Academy of Sciences(No.Y290061011)
文摘This paper reports my recent study[1]on the shear viscosity of neutron-rich nuclear matter from a relaxation time approach.An isospin- and momentum-dependent interaction is used in the study.Dependence of density,temperature,and isospin asymmetry of nuclear matter on its shear viscosity have been discussed.Similar to the symmetry energy,the symmetry shear viscosity is defined and its density and temperature dependence are studied.
基金Supported by National Science Foundation-Physics(No.1066031)the China-US Theory Institute for Physics with Exotic Nuclei
文摘We studied the role that electron gas has on the formation of nuclear structures at subsaturation densities and low temperatures(T<1 Me V).Using a classical molecular dynamics model we studied isospin symmetric and asymmetric matter at subsaturation densities and low temperatures varying the Coulomb interaction strength.The effect of such variation was quantified on the fragment size multiplicity,the inter-particle distance,the isospin content of the clusters,the nucleon mobility and cluster persistence,and on the nuclear structure shapes.We found that the presence of an electron gas distributes matter more evenly,disrupts the formation of larger objects,reduces the isospin content,and modifies the nucleon average displacement,but does not affect the inter-nucleon distance in clusters.The nuclear structures are also found to change shapes by different degrees depending on their isospin content,temperature and density.
基金Supported by National Natural Science Foundation of China(NSFC) projects (Nos.11147144 and 11305121)
文摘The hadron-quark phase transition is studied with the newly constructed Hadron-Poyakov-Nambu- Jona-Lasinio(PNJL) model.Particularly,in the description of quark matter,we include the isoscalar-vector interaction.With the constraints of neutron star observations,our calculation shows the isoscalar-vector interaction between quarks is indispensable if massive hybrids star exist in the universe.Its strength determines the onset density of quark matter,and the mass-radius relations of hybrid stars.Also,as a connection with heavy-ion-collision experiments,we discuss the strength of isoscalar-vector interaction and its effect on the signals of hadron-quark phase transition in heavy-ion collisions,such as NICA at JINR-Dubna and FAIR at GSI-Darmstadt.
