Reaction Time in the <SUP>19</SUP>F+<SUP>93</SUP>Nb Dissipative Collision

TIAN Wen-Dong; WANG Qi; LI Song-Lin; DONG Yu-Chuan; GUO Zhong-Yan; ZHAN Wen-Long; XIAO Guo-Qing; LI Zhi-Chang; LU Xiu-Qin; ZHAO Kui; FU Chang-Bo; LIU Jian-Cheng

Chinese Physics C> 2002, Vol. 26> Issue(3) : 239-244

Reaction Time in the ¹⁹F+⁹³Nb Dissipative Collision

Institute of Modern Physics, The Chinese Academy of Sciences, Lanzhou 730000, China2 China Institute of Atomic Energy, Beijing 102413, China

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Abstract：
The Angular distribution and excitation function of the disspative products have been measured in the reaction ¹⁹F+⁹³Nb. The reaction time of the dissipative products is extracted from the angular distribution and compared with that extracted from their energy auto-correlation function. A great difference exists between the reaction times extracted from these two methods. The results obtained from analyzing these two methods in different symmetrical reaction systems show that the reaction time extracted in the more symmetrical system by analyzing the slope of the angular distribution demonstrates the characteristic times of both direct and dissipative products, while the reaction times extracted in the more asymmetrical system only reflects the character of the direct products. But the method of the energy auto-correlation function can give the characteristic time for dissipative products in both symmetrical and asymmetrical system. In addition, the damping rotation feature of the dinuclear system formed in the dissipative reaction can be described by analyzing the energy auto-correlation function.

References

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Suomijarvi T, Laces R, Mermatz M C et al. Z. Phys., 1985, A321: 531-5322 Mermaz M C, Berthier B, Lucas R et al. Nucl. Phys., 1986, A456: 186-2043 Pappalardo G. Nucl. Phys., 1988, A488:395c-408c4 Papa M, Cardella G, Di Pietro A et al. Z. Phys, 1995, A353: 205-2125 Papa M, Amorini F, Cardella G et al. Phys. Rev., 2000, C61: 0446146 Ericson T. Ann. Phys, 1963, 23: 390-4147 KUN S Y. Z. Phys., 1997, A357:255-2698 KUN S Y. Z.. Phys., 1997, A357:271-2919 KUN S Y. Z,. Phys., 1997, A357:367-37510 Richter .A .Nuclear Spectroscopy and Reactions. In: ed Cemy J, 1974 Part B, 343I1 WANG Qi, TIAN Wen-Dong, LI Song- Lin et al. HEPNP, 2000, 24(11):1060-1065(in Chinese)(王琦, 田文栋, 李松林等高能物理与核物理, 2000, 2400: 1060-1065)12 TIAN Wen-Dong. On the Mechanism of the Energy Structure of the Excitation Functions in the Dissipetive Reations, Doctor Thesis, Institute of Modem Physics, The Chinese Academy of Science, 2000(in Chinese)(田文栋. 耗散反应激发函数中能量结构现象的机制研究, 博士沦文, 中国科学院近代物理研究所, 2000)

[1] YE Wei . Possible Dependence of Dissipation Strength on Angular Momentum. Chinese Physics C, 2006, 30(8): 759-760.
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TIAN Wen-Dong, WANG Qi, LI Song-Lin, DONG Yu-Chuan, GUO Zhong-Yan, ZHAN Wen-Long, XIAO Guo-Qing, LI Zhi-Chang, LU Xiu-Qin, ZHAO Kui, FU Chang-Bo, LIU Jian-Cheng, Reaction Time in the ¹⁹F+⁹³Nb Dissipative Collision[J]. Chinese Physics C, 2002, 26(3): 239-244.

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Received: 2001-04-02
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

Reaction Time in the ¹⁹F+⁹³Nb Dissipative Collision

Corresponding author: TIAN Wen-Dong,

Institute of Modern Physics, The Chinese Academy of Sciences, Lanzhou 730000, China2 China Institute of Atomic Energy, Beijing 102413, China

Received Date: 2001-04-02
Accepted Date: 1900-01-01
Available Online: 2002-03-05

Abstract: The Angular distribution and excitation function of the disspative products have been measured in the reaction ¹⁹F+⁹³Nb. The reaction time of the dissipative products is extracted from the angular distribution and compared with that extracted from their energy auto-correlation function. A great difference exists between the reaction times extracted from these two methods. The results obtained from analyzing these two methods in different symmetrical reaction systems show that the reaction time extracted in the more symmetrical system by analyzing the slope of the angular distribution demonstrates the characteristic times of both direct and dissipative products, while the reaction times extracted in the more asymmetrical system only reflects the character of the direct products. But the method of the energy auto-correlation function can give the characteristic time for dissipative products in both symmetrical and asymmetrical system. In addition, the damping rotation feature of the dinuclear system formed in the dissipative reaction can be described by analyzing the energy auto-correlation function.