The neutron flow model predicts that neutrons start to flow freely between the approaching nuclei ^58Fe and ^208 pb at s=3fm, a length in which the effective surfaces of these nuclei are 3 fm apart. As a result of neu...The neutron flow model predicts that neutrons start to flow freely between the approaching nuclei ^58Fe and ^208 pb at s=3fm, a length in which the effective surfaces of these nuclei are 3 fm apart. As a result of neutron flow, the N/Z value rapidly reaches an equilibrium distribution. Meanwhile the system, originally in the fusion valley, is injected into the asymmetric fission valley. The dynamic process of the composite nucleus in the asymmetric fission valley is treated with a two-parameter Smoluchowski equation. It is shown that the probability to overcome the asymmetric fission barrier and to achieve compound nucleus configuration, hence the fusion cross section is obviously suppressed due to the effect of isospin equilibrium.展开更多
Based on the improved isospin-dependent quantum molecular dynamics model, the fusion barrier in the synthesis of superheavy elements is studied dynamically. Deformation effect and nucleon transfer in neck region are a...Based on the improved isospin-dependent quantum molecular dynamics model, the fusion barrier in the synthesis of superheavy elements is studied dynamically. Deformation effect and nucleon transfer in neck region are also investigated systematically, which can lower the dynamical barrier since the neck formation. It is shown that the neck radius is dependent on the incident energy and collision orientation. For the static barrier, the model almost gives the same results with the proximity potential.展开更多
基金Supported by the National Natural Science Foundation of China under Grants Nos 10235020 and 10235030, and the Major State Basic Research Development Programme under Grant No G200007400.
文摘The neutron flow model predicts that neutrons start to flow freely between the approaching nuclei ^58Fe and ^208 pb at s=3fm, a length in which the effective surfaces of these nuclei are 3 fm apart. As a result of neutron flow, the N/Z value rapidly reaches an equilibrium distribution. Meanwhile the system, originally in the fusion valley, is injected into the asymmetric fission valley. The dynamic process of the composite nucleus in the asymmetric fission valley is treated with a two-parameter Smoluchowski equation. It is shown that the probability to overcome the asymmetric fission barrier and to achieve compound nucleus configuration, hence the fusion cross section is obviously suppressed due to the effect of isospin equilibrium.
基金Supported by the National Natural Science Foundation of China under Grant No 10475100.
文摘Based on the improved isospin-dependent quantum molecular dynamics model, the fusion barrier in the synthesis of superheavy elements is studied dynamically. Deformation effect and nucleon transfer in neck region are also investigated systematically, which can lower the dynamical barrier since the neck formation. It is shown that the neck radius is dependent on the incident energy and collision orientation. For the static barrier, the model almost gives the same results with the proximity potential.
