摘要The dynamic, adiabatic and diabatic entrance potentials in strongly damped reactions of 238U+238U, 232Th+250Cf are calculated and compared. The feature of the dynamical potential implies that it is possible for the composite systems to stick together for a period of time. By means of the improved quantum molecular dynamics model the time evolution of the density and charge distributions of giant composite systems and their fragments for reactions 238U+238U, 232Th+250Cf are investigated, from which the lifetimes of giant composite systems at different energies are obtained. The longest average lifetime of 238U+238U is found when the incident energy is about Ec.m=1080MeV, which is about 1200fm/c.
Abstract：The dynamic, adiabatic and diabatic entrance potentials in strongly damped reactions of 238U+238U, 232Th+250Cf are calculated and compared. The feature of the dynamical potential implies that it is possible for the composite systems to stick together for a period of time. By means of the improved quantum molecular dynamics model the time evolution of the density and charge distributions of giant composite systems and their fragments for reactions 238U+238U, 232Th+250Cf are investigated, from which the lifetimes of giant composite systems at different energies are obtained. The longest average lifetime of 238U+238U is found when the incident energy is about Ec.m=1080MeV, which is about 1200fm/c.
TIAN Jun-Long;WU Xi-Zhen;OU Li;LI Zhu-Xia;. The Average Lifetime of Giant Composite Systems Formed in Strongly Damped Collisions[J]. 中国物理快报, 2007, 24(10): 2796-2799.
TIAN Jun-Long, WU Xi-Zhen, OU Li, LI Zhu-Xia,. The Average Lifetime of Giant Composite Systems Formed in Strongly Damped Collisions. Chin. Phys. Lett., 2007, 24(10): 2796-2799.
[1] Hofmann S et al %and Munzenberg G2000 Rev. Mod. Phys. 72 733 [2] Oganessian Y T et al %, Utyonkov V K, Lobanov Y V et al2004 Phys. Rev. C 70 064609 [3] Herrmann G 1979 Nature 280 543 [4] Seaborg G T et al % ,Loveland W and Morrissey D J1979 Scince 203 711 [5] Maruhn J A et al %, Hahn J, Lustig H J, Ziegenhan K H and Greiner W1980 Prog. Part. Nucl. Phys. 4 257 [6] Riedel C and Norenberg W 1979 Z. Phys. 290 385 [7] Gaggeler H et al %, Trautmann N, Bruchle W et al1980 Phys. Rev. Lett. 45 1824 [8] Hildenbrand K D et al %, Freiesleben H, Puhlhofer F et al1977 Phys. Rev. Lett. 39 1065 [9] Schadel M et al %, Kratz J V, Ahrens H et al1978 Phys. Rev. Lett. 41 469 Schadel M et al %, Bruchle W, Gaggeler H et al1982 Phys. Rev. Lett. 48 852 [10] Maruyama T et al %, Bonasera A, Papa M and Chiba S2002 Eur. Phys. J. A 14 191 [11] Wang N et al %, Li Z X, Wu X Z and Zhao E G2005 Mor. Phys. Lett. A 20 1 [12] Zagrebaev V I et al %, Oganessian Y T, Itkis M G, and Greiner W2006 Phys. Rev. C 73 031602(R) [13] Greiner W 1983 Quantum Electrodynamics of Strong Fields(New York: Plenum) [14] Wang N et al %, Li Z X, Wu X Z et al2004 Phys. Rev. C 69 034608 [15] Feldmeier H and Schnack J 2000 Rev. Mod. Phys. 72 655 [16] Papa M et al %, Maruyama T and Bonasera A2001 Phys. Rev. C 64 024612 [17] Wang N et al %, Li Z X and Wu X Z2002 Phys. Rev. C 65 064608
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