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本文简评了直到费米能区的重离子近心碰撞。在非对称重反应系统中,线动量转移限限制了所形成热核的温度。由于蒸发竞争,热核接续二体裂变也许是不可能的。与硬
γ
射线符合时,可挑选近心碰撞事件,这时更热的核可用来作核温度上限研究。对
28
Si+
197
Au系统,直到15MeV/A,一裂片脱离反应平面的标准宽度线性地依赖单核子激发能,而且与其他数据也符合一致。这一拟合直线可能用来从这个宽度估计激发能。
The central collisions of heavy ions for energies up to Fermi energy domain have been reviewed in summary. The limitation of linear momentum transfer (LMT) limits the temperature of the hot nucleus formed in an asymmetry system. Because of the comperature of evaporation
the sequential binary fission of the hot nucleus may not be possible.
In coincidence with hard gamma rays
the events of central collisions could be selected. The hotter nuclei could be us:d for the research of up-limit of nuclear temperature. For the
28
Si+
197
Au system the standard deviation of out-of-the reaction plane for one fission fragment depends linearly on the excitation energy per nucleon up to 15MeV/A. It is the same for other systems. The linear dependence could be used for estimation of excitation energy by the standard deviation.
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