Based on the quantum molecular dynamics model,we investigate the dynamical behaviors of the excited nuclear system to simulate the latter stage of heavy ion reactions,which associate with a liquid-gas phase transition...Based on the quantum molecular dynamics model,we investigate the dynamical behaviors of the excited nuclear system to simulate the latter stage of heavy ion reactions,which associate with a liquid-gas phase transition.We try to search a microscopic way to describe the phase transition in realnuclei.The Lyapunov exponent is employed and examined for our purpose.We find out that the Lyapunov exponent is one of good microscopic quantities to describe the phase transition in hot nuclei.Coulomb potential and the finite size effect may give a strong influence on the critical temperature.However,the collision term plays a minor role in the process of the liquid-gas phase transition in finite systems.展开更多
We study one-and two-neutron transfer reactions in ^(11)Be+^(208)Pb by using the quantum molecular dynamics model.We find that lowering about 1-2 MeV of the potential barrier of ^(208)Pb for fusion is gained when two ...We study one-and two-neutron transfer reactions in ^(11)Be+^(208)Pb by using the quantum molecular dynamics model.We find that lowering about 1-2 MeV of the potential barrier of ^(208)Pb for fusion is gained when two neutrons separated from ^(11)Be enter into ^(208)Pb.Whereas no significant change of potential barrier is found when only the halo neutron separated from ^(11)Be enters into ^(208)Pb.The dynamical interplay between suppression and enhancement effects on the fusion probability in reaction ^(11)Be+^(208)Pb stemming from the easy separation of halo neutron and the long extending of neutron distribution is discussed.展开更多
基金Supported in part by the National Natural Science Foundation of China under Grant Nos.19775066 and 19975073the Nuclear Industry and Science Foundation of China.
文摘Based on the quantum molecular dynamics model,we investigate the dynamical behaviors of the excited nuclear system to simulate the latter stage of heavy ion reactions,which associate with a liquid-gas phase transition.We try to search a microscopic way to describe the phase transition in realnuclei.The Lyapunov exponent is employed and examined for our purpose.We find out that the Lyapunov exponent is one of good microscopic quantities to describe the phase transition in hot nuclei.Coulomb potential and the finite size effect may give a strong influence on the critical temperature.However,the collision term plays a minor role in the process of the liquid-gas phase transition in finite systems.
基金the National Natural Science Foundation of China under Grant Nos.19675069 and 19975073.
文摘We study one-and two-neutron transfer reactions in ^(11)Be+^(208)Pb by using the quantum molecular dynamics model.We find that lowering about 1-2 MeV of the potential barrier of ^(208)Pb for fusion is gained when two neutrons separated from ^(11)Be enter into ^(208)Pb.Whereas no significant change of potential barrier is found when only the halo neutron separated from ^(11)Be enters into ^(208)Pb.The dynamical interplay between suppression and enhancement effects on the fusion probability in reaction ^(11)Be+^(208)Pb stemming from the easy separation of halo neutron and the long extending of neutron distribution is discussed.
