Study on Fusion Potential Barrier in Heavy Ion Reactions Based on the Dynamical Model

TIAN Jun-Long; WU Xi-Zhen; LI Zhu-Xia; WANG Ning; LIU Fu-Hu

Chinese Physics C> 2004, Vol. 28> Issue(7) : 725-732

Study on Fusion Potential Barrier in Heavy Ion Reactions Based on the Dynamical Model

China Institute of Atomic Energy,Beijing 102413,China2 Institute of Modern Physics,Shanxi Teachers University,Linfen 041004,China3 Center of Theoretical Nuclear Physics,National Laboratory of Heavy Ion Accelerator,Lanzhou 730000,China4 Institute of Theoretical Physics,CAS,Beijing 100080,China

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Abstract：
Based on an improved quantum molecular dynamics model the static and dynamic potential in the entrance channel of synthesis of superheavy nuclei are studied. The dependence of the static potential (and driving potential) on mass-asymmetry is obtained. From this study we find out that the mass-symmetric system seems to be difficult to fuse and the fusing system with the largest driving potential could be the optimal choice of the projectile-target combination. By comparing the static potential barrier with the dynamic one we find that the latter one is lower than former one obviously, and that the dynamical potential barrier is entrance energy dependent. The maximum and minimum of dynamic potential barriers approach to the diabatic (sudden approximation) and the adiabatic static potential barriers, respectively.

References

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. Bass R. Nuclear Reactions with Heavy Ion. Springer-Verlag, Berlin,1980. 2832. Denisov V Y, Norenberg W. Eur. Phys. J ., 2002. A15 : 3753. Feshbach H. Reflection on the PILACWorkshop. in : John Sons. Theoretical Nuclear Physics : Nuclear Reactions. New York : AIP Conf .Proc., 1992. 2474. Mahaux C, Weidenmuller H A. Shell2Model Approach to Nuclear Reactions. Amsterdam: North-Holland Publishing Co., 1969. 205. Skorka S J, Schomburg W K, Borges AMet al . Effect of Neutron Trans-fer and Inelastic Scattering in Subbarrier Fusion. in :Furuno Kand Kish-imoto T. Heavy Ion Fusion Reactions. TSUKUBA: World Scientific Publishing Co. Pte. Ltd., 1985. 36. WANG Ning, WU XiZhen, LI ZhuXia. Phys. Rev., 2002, C65 :064608 ; Phys. Rev., 2003, C67 : 0246047. Bass R. Nucl . Phys., 1974, A213 : 458. Kroppe, Nix, Sierk. Atomoic Data. Nucl . Data, 1993, 59 : 1859. Myers W D, Swiatecki W J . Phys. Rev., 2000, C62 : 04461010. Denisov V Y. Phys. Lett ., 2002, B526 : 31511. Giardina G, Agostino P D, Fazio G et al . Pramana-J . Phys., 1999,53 : 40912. Zagrebaev V I. Journal of Nuclear and Radiochemical Science, 2002,3 : 1313. Cherepanov E A. Pramana-J . Phys., 1999, 53 : 61914. Diaz-Torres A, Adamian G G, Antonenko NV. Phys. Lett ., 2000,B481 : 22815. Volkov V V. Acta Physica Polonica, 1999, B30 : 1517

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TIAN Jun-Long, WU Xi-Zhen, LI Zhu-Xia, WANG Ning and LIU Fu-Hu. Study on Fusion Potential Barrier in Heavy Ion Reactions Based on the Dynamical Model[J]. Chinese Physics C, 2004, 28(7): 725-732.

TIAN Jun-Long, WU Xi-Zhen, LI Zhu-Xia, WANG Ning and LIU Fu-Hu. Study on Fusion Potential Barrier in Heavy Ion Reactions Based on the Dynamical Model[J]. Chinese Physics C, 2004, 28(7): 725-732. shu

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Received: 2003-11-03
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Study on Fusion Potential Barrier in Heavy Ion Reactions Based on the Dynamical Model

Corresponding author: WU Xi-Zhen,

China Institute of Atomic Energy,Beijing 102413,China2 Institute of Modern Physics,Shanxi Teachers University,Linfen 041004,China3 Center of Theoretical Nuclear Physics,National Laboratory of Heavy Ion Accelerator,Lanzhou 730000,China4 Institute of Theoretical Physics,CAS,Beijing 100080,China

Received Date: 2003-11-03
Accepted Date: 1900-01-01
Available Online: 2004-07-05

Abstract: Based on an improved quantum molecular dynamics model the static and dynamic potential in the entrance channel of synthesis of superheavy nuclei are studied. The dependence of the static potential (and driving potential) on mass-asymmetry is obtained. From this study we find out that the mass-symmetric system seems to be difficult to fuse and the fusing system with the largest driving potential could be the optimal choice of the projectile-target combination. By comparing the static potential barrier with the dynamic one we find that the latter one is lower than former one obviously, and that the dynamical potential barrier is entrance energy dependent. The maximum and minimum of dynamic potential barriers approach to the diabatic (sudden approximation) and the adiabatic static potential barriers, respectively.