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Improved isospin dependent quantum molecular dynamics model and its application to fusion reactions near Coulomb barrier |
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| Authors: | Zhao-Qing Feng Feng-Shou Zhang Gen-Ming Jin Xi Huang |
| Institution: | aCenter of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, China bInstitute of Modern Physics, Chinese Academy of Sciences, PO Box 31, Lanzhou 730000, China cInstitute of Low Energy Nuclear Physics, Beijing Normal University, Beijing 100875, China dCCAST (Word Laboratory), PO Box 8730, Beijing 100080, China eGraduate School, Chinese Academy of Sciences, Beijing 100039, China |
| Abstract: | The isospin dependent quantum molecular dynamics model is developed by introducing switch function method which deals with correctly the surface interaction and shell effect in the process of projectile and target approaching. The fusion excitation functions for 40Ca + 40Ca, 40Ca + 48Ca and 48Ca + 48Ca at energies in the vicinity of the Coulomb barrier are studied. The experimental data of the fusion cross sections for these three systems can be regenerated very well. It is found that the fusion cross sections for neutron-rich system increase obviously. The static and dynamical Coulomb barriers are studied in order to clarify the phenomena. The neutron to proton ratio (N/Z ratio) at neck region is also studied, which apparently presents isospin effects of projectile-target combinations. |
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