A new version of improved quantum molecular dynamics model that includes standard Skyrme interactions has been developed.Based on the new code,four commonly used parameter sets,SLy4,SkI2,SkM*and Gs are adopted in the ...A new version of improved quantum molecular dynamics model that includes standard Skyrme interactions has been developed.Based on the new code,four commonly used parameter sets,SLy4,SkI2,SkM*and Gs are adopted in the improved quantum molecular dynamics model and the isospin sensitive observables,namely isospin transport ratios,single and double ratios of the yields of neutrons and protons are investigated.The isospin transport ratios are strongly sensitive to the slope of symmetry energy,and are not very sensitive to the nucleon effective mass splitting.On the other hand,the high energy neutrons and protons yields ratios from reactions at different incident energies provide a good observable to the momentum dependence of nucleon effective mass splitting.By comparing our calculations with the data,we find that the constrained L value(the slope of density dependence of symmetry energy) is about ~46 MeV when the Skyrme type interaction is considered in transport models,and the isospin diffusion data prefer to mn*>mp*,but it is not a strong constraint with deep χ2minimum.展开更多
The theoretical foundation of Quantum Molecular Dynamics(QMD)is investigated in the framework of the Husimi representation.The kinetic equation in Husimi representation is derived and it is demonstrated that itsħ→0 l...The theoretical foundation of Quantum Molecular Dynamics(QMD)is investigated in the framework of the Husimi representation.The kinetic equation in Husimi representation is derived and it is demonstrated that itsħ→0 limit is just the QMD or,in other words,QMD is the coarse grained Vlasov-Uehling-Uhlenbeck theory(VUU).展开更多
The properties of the Superdeformed giant dipole resonance(SDGDR)in rotating 146-152Dy even nuclei are studied based on the linear response theory with the self-consistently determined,superdeformed mean field.The obt...The properties of the Superdeformed giant dipole resonance(SDGDR)in rotating 146-152Dy even nuclei are studied based on the linear response theory with the self-consistently determined,superdeformed mean field.The obtained features may serve as the criteria of observing the SDGDR.展开更多
The analytical expressions of the second moments for a dissipative quantum system are derived by using path integral method with a solvable model.The quantum and non-Markovian effects on the quantum Brownian motion ar...The analytical expressions of the second moments for a dissipative quantum system are derived by using path integral method with a solvable model.The quantum and non-Markovian effects on the quantum Brownian motion are studied quantitatively.展开更多
The correlation between the shape of rapidity distribution of the yield of light charged particles and the fragmentation modes in semi-peripheral collisions for70Zn+70Zn,64Zn+64Zn and64Ni+64Ni at the beam energy of 35...The correlation between the shape of rapidity distribution of the yield of light charged particles and the fragmentation modes in semi-peripheral collisions for70Zn+70Zn,64Zn+64Zn and64Ni+64Ni at the beam energy of 35 Me V/nucleon is investigated based on Im QMD05 code. Our studies show there is an interplay between the binary, ternary and multi-fragmentation break-up modes.The binary and ternary break-up modes more prefer to emit light charged particles at middle rapidity and give larger values of Rmid yieldcompared with the multi-fragmentation break-up mode does. The reduced rapidity distribution for the normalized yields of p, d, t,3He,4He and6 He and the corresponding values of Rmid yieldcan be used to estimate the probability of multi-fragmentation break-up modes. By comparing to experimental data, our results illustrate that 40% of the collisions events belong to the multifragmentation break-up mode for the reactions we studied.展开更多
Some nearly-symmetric fusion reactions are systematically investigated with the improved quantum molecular dynamics(Im QMD)model. By introducing two-body inelastic scattering in the Fermi constraint procedure, the sta...Some nearly-symmetric fusion reactions are systematically investigated with the improved quantum molecular dynamics(Im QMD)model. By introducing two-body inelastic scattering in the Fermi constraint procedure, the stability of an individual nucleus and the description of fusion cross sections at energies near the Coulomb barrier can be further improved. Simultaneously, the quasifission process in154Sm+160Gd is also investigated with the microscopic dynamics model for the first time. We find that at energies above the Bass barrier, the fusion probability is smaller than 10-5for this reaction, and the nuclear contact time is generally smaller than 1500 fm/c. From the central collisions of Sm+Gd, the neutron-rich fragments such as164,165 Gd,192W can be produced in the Im QMD simulations, which implies that the quasi-fission reaction could be an alternative way to synthesize new neutron-rich heavy nuclei.展开更多
基金Supported by National Natural Science Foundation of China(NSFC) projects (Nos.11075215,10875031,11005022,11005155 and 11275052)973 Program of China(No.2013CB834404)National Science Foundation(Grants No.PHY-0606007)
文摘A new version of improved quantum molecular dynamics model that includes standard Skyrme interactions has been developed.Based on the new code,four commonly used parameter sets,SLy4,SkI2,SkM*and Gs are adopted in the improved quantum molecular dynamics model and the isospin sensitive observables,namely isospin transport ratios,single and double ratios of the yields of neutrons and protons are investigated.The isospin transport ratios are strongly sensitive to the slope of symmetry energy,and are not very sensitive to the nucleon effective mass splitting.On the other hand,the high energy neutrons and protons yields ratios from reactions at different incident energies provide a good observable to the momentum dependence of nucleon effective mass splitting.By comparing our calculations with the data,we find that the constrained L value(the slope of density dependence of symmetry energy) is about ~46 MeV when the Skyrme type interaction is considered in transport models,and the isospin diffusion data prefer to mn*>mp*,but it is not a strong constraint with deep χ2minimum.
基金Supported by the National Natural Science Foundation of China.
文摘The theoretical foundation of Quantum Molecular Dynamics(QMD)is investigated in the framework of the Husimi representation.The kinetic equation in Husimi representation is derived and it is demonstrated that itsħ→0 limit is just the QMD or,in other words,QMD is the coarse grained Vlasov-Uehling-Uhlenbeck theory(VUU).
基金Project supported by the National Science Foundation of China.
文摘The properties of the Superdeformed giant dipole resonance(SDGDR)in rotating 146-152Dy even nuclei are studied based on the linear response theory with the self-consistently determined,superdeformed mean field.The obtained features may serve as the criteria of observing the SDGDR.
基金Supported by the Natural Science Foundstion of China。
文摘The analytical expressions of the second moments for a dissipative quantum system are derived by using path integral method with a solvable model.The quantum and non-Markovian effects on the quantum Brownian motion are studied quantitatively.
基金supported by the National Key Basic Research Program of China(Grant No.2013CB834404)the National Natural Science Foundation of China(Grant Nos.11475262,11422548,11375062 and11375094)
文摘The correlation between the shape of rapidity distribution of the yield of light charged particles and the fragmentation modes in semi-peripheral collisions for70Zn+70Zn,64Zn+64Zn and64Ni+64Ni at the beam energy of 35 Me V/nucleon is investigated based on Im QMD05 code. Our studies show there is an interplay between the binary, ternary and multi-fragmentation break-up modes.The binary and ternary break-up modes more prefer to emit light charged particles at middle rapidity and give larger values of Rmid yieldcompared with the multi-fragmentation break-up mode does. The reduced rapidity distribution for the normalized yields of p, d, t,3He,4He and6 He and the corresponding values of Rmid yieldcan be used to estimate the probability of multi-fragmentation break-up modes. By comparing to experimental data, our results illustrate that 40% of the collisions events belong to the multifragmentation break-up mode for the reactions we studied.
基金supported by the National Natural Science Foundation of China(Grant Nos.11422548,11275052,11365005 and 11375062)the Open Project Program of State Key Laboratory of Theoretical Physics,Institute of Theoretical Physics,Chinese Academy of Sciences,China(Grant No.Y4KF041CJ1)
文摘Some nearly-symmetric fusion reactions are systematically investigated with the improved quantum molecular dynamics(Im QMD)model. By introducing two-body inelastic scattering in the Fermi constraint procedure, the stability of an individual nucleus and the description of fusion cross sections at energies near the Coulomb barrier can be further improved. Simultaneously, the quasifission process in154Sm+160Gd is also investigated with the microscopic dynamics model for the first time. We find that at energies above the Bass barrier, the fusion probability is smaller than 10-5for this reaction, and the nuclear contact time is generally smaller than 1500 fm/c. From the central collisions of Sm+Gd, the neutron-rich fragments such as164,165 Gd,192W can be produced in the Im QMD simulations, which implies that the quasi-fission reaction could be an alternative way to synthesize new neutron-rich heavy nuclei.
