Multifragmentation of very heavy nuclear systems (III): Fragment velocity correlations and event topology at freeze-out
Multifragmentation of very heavy nuclear systems (III): Fragment velocity correlations and event topology at freeze-out
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DOI：
10.1016/j.nuclphysa.2005.08.019
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发表时间：
2006-01-09
期刊：
影响因子：
--
通讯作者：
Rosato
中科院分区：
文献类型：
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作者：
G. INDRA Collaboration;M.F. Tăbăcaru;B. Rivet;M. Borderie;B. Pârlog;A. Bouriquet;J.D. Chbihi;J.P. Frankland;E. Wieleczko;R. Bonnet;R. Bougault;E. Dayras;D. Galichet;P. Guinet;N. Lautesse;O. Le Neindre;L. Lopez;L. Manduci;P. Nalpas;E. Pawłowski; Rosato
用随机平均场方法模拟了32 A MeV ~（129） natSn和36 A MeV ~（155）Gd ~+ natU中心碰撞。因此，根据模拟，估计平均冻结时间为200-240 fm/c。对于较轻的系统，碎片的相应空间分布更紧凑（ ∼ 3 – 4 V 0 vs. ∼ 8 V 0 ).
Kinetic energy spectra and fragment velocity correlations, simulated by means of stochastic mean-field calculations, are successfully confronted with experimental data for single multifragmenting sources prepared at the same excitation energy per nucleon in 32 A MeV 129Xe+ natSn and 36 A MeV 155Gd+ natU central collisions. Relying thus on simulations, average freeze-out times of 200–240 fm/c are estimated. The corresponding spatial distributions of fragments are more compact for the lighter system ( ∼ 3 – 4 V 0 vs. ∼ 8 V 0 ).