Study of Reaction Mechanism of Intermediate Energy Protons Bombarding Heavy Nuclei

FAN Sheng; LI ZhuXia

Chinese Physics C> 2000, Vol. 24> Issue(8) : 755-760

Study of Reaction Mechanism of Intermediate Energy Protons Bombarding Heavy Nuclei

FAN Sheng ^, ,
LI ZhuXia

Department of Technical Physics, Peking University, Beijing 100871, China2 China Institute of Atomic Energy, Beijing 102413, China3 Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, China4 Institute of Theoretical Physics, The Chinese Academy of Sciences, Beijing 100080, China

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Abstract：
The reactions for intermediate energy protons bombarding ²⁰⁸Pb have been analyzed by the quantum molecular dynamics model (QMD). It is found that the whole reaction process can be divided into three stages, i.e. the direct, the cascade and the evaporation stage. The time scale of the change of reaction mechanism in the process of reaction is investigated. The corresponding time scales of the direct, the cascade and the evaporation stage are about<30 fm/c, 30—100fm/c and >100fm/c, respectively. The calculation results of the double differential cross sections for reaction ²⁰⁸Pb (p, xn) can reproduce the experimental results reasonably well.

References

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. Armstrong T W et al.ORNL TM 3667,1972. 2. Richard E et al.LA UR 30 14 ,1989. 3. Sobolevsky N .NSC/DOC( 96) – 15,1996. 4. Hartnack Ch ,LI Z et al.Nucl.Phys.,1989,A4 95:32 0. 5. Aichelin J et al.Phys.Rev .,1988,C37:2 4 51. 6. Aichelin J et al.Phys.Reports,1991,2 0 2 ( 5,6) :2 33. 7. Sangster T C et al.Phys.Rev .,1992 ,C4 6:14 0 4. 8. KojiNiita et al.Phys.Rev.,1995,C52 :2 62 0. 9. Chadwick M B et al.Phys.Rev.,1995,C52 :2 80 0 10. Chiba S et al.Phys.Rev .,1996,C53 :182 4 ;1996,C54 :2 85;1996,C54 :330 211. FAN Sheng .The Ph .D .Thesis of China Institute of Atomic Energy(in Chinese) ,Beijing ,1998,12(樊胜 .中国原子能科学研究院博士论文 ,1998,12 ) 12. FAN Sheng et al.Eur.Phys .J.,1999,A4 :61— 68 13. Feshbach H .Theoretical Nuclear Physics,NewYork :John Wiley and Songpress Inc .,199214. Amian W B et al.Nucl.Sci.and Eng .,1992 ,112 :7815. Ishibashi K et al.J.Nucl.Sci.and Eng.,1997,34 :2 59 16. Filges D et al.KfK – 3779,1980

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FAN Sheng and LI ZhuXia. Study of Reaction Mechanism of Intermediate Energy Protons Bombarding Heavy Nuclei[J]. Chinese Physics C, 2000, 24(8): 755-760.

FAN Sheng and LI ZhuXia. Study of Reaction Mechanism of Intermediate Energy Protons Bombarding Heavy Nuclei[J]. Chinese Physics C, 2000, 24(8): 755-760. shu

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Received: 1999-04-02
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 of Reaction Mechanism of Intermediate Energy Protons Bombarding Heavy Nuclei

FAN Sheng ^,
LI ZhuXia

Corresponding author: FAN Sheng,

Department of Technical Physics, Peking University, Beijing 100871, China2 China Institute of Atomic Energy, Beijing 102413, China3 Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, China4 Institute of Theoretical Physics, The Chinese Academy of Sciences, Beijing 100080, China

Received Date: 1999-04-02
Accepted Date: 1900-01-01
Available Online: 2000-08-05

Abstract: The reactions for intermediate energy protons bombarding ²⁰⁸Pb have been analyzed by the quantum molecular dynamics model (QMD). It is found that the whole reaction process can be divided into three stages, i.e. the direct, the cascade and the evaporation stage. The time scale of the change of reaction mechanism in the process of reaction is investigated. The corresponding time scales of the direct, the cascade and the evaporation stage are about<30 fm/c, 30—100fm/c and >100fm/c, respectively. The calculation results of the double differential cross sections for reaction ²⁰⁸Pb (p, xn) can reproduce the experimental results reasonably well.