Dynamic Model Study of Fusion Reactions for <SUP>40,48</SUP>Ca+<SUP>90,96</SUP>Zr

ZHAO Kai; LI Zhu-Xia; WU Xi-Zhen; WANG Ning; ZHANG Ying-Xun; TIAN Jun-Long; ZHANG Huan-Qiao; LIU Zu-Hua

Chinese Physics C> 2006, Vol. 30> Issue(1) : 26-31

Dynamic Model Study of Fusion Reactions for ^40,48Ca+^90,96Zr

China Institute of Atomic Energy,Beijing 102413,China2 Center of Theoretical Nuclear Physics,National Laboratory of Heavy Ion Accelerator of Lanzhou,Lanzhou 730000,China3 Institute of Theoretical Physics,Chinese Academy of Science,Beijing 100080,China

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Abstract：
Based on the Improved Quantum Molecular Dynamics Model the fusion reactions of ^40,48Ca+^90,96Zr are studied by making a more rigorous treatment of the initial condition. The study shows that:(1) the calculated fusion cross sections for all four reactions of ^40,48Ca+^90,96Zr are in good agreement with experiment data; (2) the sub-barrier fusion for the neutron-rich reaction ⁴⁰Ca+⁹⁶Zr is ubstantially enhanced as compared with the other three reactions. In order to understand the reason why the sub-barrier fusion of the neutron-rich reaction ⁴⁰Ca+⁹⁶Zr is enhanced as compared with the non-neutron-rich reaction ⁴⁰Ca+⁹⁶Zr and that of the neutron-rich reaction ⁴⁸Ca+⁹⁶Zr is not enhanced, the further investigations are carried out, those are: the dynamic fusion barriers for four reactions, the relation between dynamic fusion barrier and nucleon transfer and the relation between nucleon transfer and corresponding reaction Q value. It has been found that positive Q value leads to the strong nucleon transfer which reduces the dynamic fusion barrier and enhances the sub-barrier fusion cross section.

References

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. WANG Ning, WU Xi-Zhen, LI Zhu-Xia. Phys. Rev., 2003,C. 67: 0246042. Newton J O, Butt R D, Dasgupta M et al. Phys. Rev.,2004, C70: 0246053. Zagrebaev V I. Phys. Rev., 2003, C67: 0616014. ZHANG Huan-Qiao, LIU Zu-Hua et al. Progress of Theo-retical Physics, 2004, 150: 315. ZHAO Kai. The Study of Dynamical Mechanism in Low Energy Fusion Reaction by Quantum Molecular DynamicsM. odel. Beijing: China Institute of Atomic Energy, P.H.DT. hesis, 2005, 6(in Chinese(赵凯.采用量f分f动力学模型研究低能核融合反应的动力学机制.北京:中国原广能科学研究院,博士论文,2005, 6)6. WANG Ning, LI Zhu-Xia, WU Xi-Zhen et al. Phys. Rev.,2004, C69: 0346087. NING Ping-Zhi, LI Lei, MIN De-Fen. Fundamental Nuclear Physics. Beijing: Higher Education Press, 2003(in Chinese(宁平治,李磊,闪德芬.原子核物理基础.北京:高等教育出版社,2003)8. Timmers, Ackermann D, Beghini S et al. Nucl. Phys., 1998,A. 633: 4219. Reiner Bass, Nuclear Reactions with Heavy Ions. New York: Berlin Heidelberg, 1980

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ZHAO Kai, LI Zhu-Xia, WU Xi-Zhen, WANG Ning, ZHANG Ying-Xun, TIAN Jun-Long, ZHANG Huan-Qiao and LIU Zu-Hua. Dynamic Model Study of Fusion Reactions for ^40,48Ca+^90,96Zr[J]. Chinese Physics C, 2006, 30(1): 26-31.

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Received: 2005-03-28
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

Dynamic Model Study of Fusion Reactions for ^40,48Ca+^90,96Zr

Corresponding author: LI Zhu-Xia,

China Institute of Atomic Energy,Beijing 102413,China2 Center of Theoretical Nuclear Physics,National Laboratory of Heavy Ion Accelerator of Lanzhou,Lanzhou 730000,China3 Institute of Theoretical Physics,Chinese Academy of Science,Beijing 100080,China

Received Date: 2005-03-28
Accepted Date: 1900-01-01
Available Online: 2006-01-05

Abstract: Based on the Improved Quantum Molecular Dynamics Model the fusion reactions of ^40,48Ca+^90,96Zr are studied by making a more rigorous treatment of the initial condition. The study shows that:(1) the calculated fusion cross sections for all four reactions of ^40,48Ca+^90,96Zr are in good agreement with experiment data; (2) the sub-barrier fusion for the neutron-rich reaction ⁴⁰Ca+⁹⁶Zr is ubstantially enhanced as compared with the other three reactions. In order to understand the reason why the sub-barrier fusion of the neutron-rich reaction ⁴⁰Ca+⁹⁶Zr is enhanced as compared with the non-neutron-rich reaction ⁴⁰Ca+⁹⁶Zr and that of the neutron-rich reaction ⁴⁸Ca+⁹⁶Zr is not enhanced, the further investigations are carried out, those are: the dynamic fusion barriers for four reactions, the relation between dynamic fusion barrier and nucleon transfer and the relation between nucleon transfer and corresponding reaction Q value. It has been found that positive Q value leads to the strong nucleon transfer which reduces the dynamic fusion barrier and enhances the sub-barrier fusion cross section.