库仑计时法探测热核衰变机制
Coulomb chronometry to probe the decay mechanism of hot nuclei
摘要：
在129个8 - 25 MeV/A的氘+锡中心碰撞中，三碎片出口通道具有显著的截面.我们表明，这些碎片产生于两个连续的二元分裂的重复合系统。确定片段产生的顺序。强库仑邻近效应观察到在三个碎片的最终状态。与库仑理论计算结果的比较表明，随着轰击能量的增加，连续破裂的时间尺度减小，在激发能E ~* = 4.0 $\pm$ 0.5 MeV/A以上，连续破裂的时间尺度变为准同时破裂。从顺序到同时破裂的这种过渡被解释为在该系统中的三个片段出口通道的多重碎片化的发病的签名。
英文摘要：
In 129 Xe+ nat Sn central collisions from 8 to 25 MeV/A, the three-fragment exit channel occurs with a significant cross section. We show that these fragments arise from two successive binary splittings of a heavy composite system. The sequence of fragment production is determined. Strong Coulomb proximity effects are observed in the three-fragment final state. A comparison with Coulomb trajec-tory calculations shows that the time scale between the consecutive break-ups decreases with increasing bombarding energy, becoming quasi-simultaneous above excitation energy E * = 4.0$\pm$0.5 MeV/A. This transition from sequential to simultaneous break-up was interpreted as the signature of the onset of multifragmentation for the three-fragment exit channel in this system.
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