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首页> 外文期刊>Nuclear Physics, A: Journal Devoted to the Experimental Study of the Fundamental Constituents of Matter and Their Actions >Conditions for the manifestation of transient effects in fission
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Conditions for the manifestation of transient effects in fission

机译：裂变瞬时效应表现的条件

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The conditions for the manifestation of transient effects in fission are carefully examined by analysing experimental data where fission is induced by peripheral heavy-ion collisions at relativistic energies. Experimental total nuclear fission cross sections of U-238 at 1 A GeV on gold and uranium targets are compared with the predictions of a nuclear-reaction code, where transient effects in fission are modeled using different approximations to the numerical time-dependent fission-decay width: a new analytical description based on the solution of the Fokker-Planck equation and two widely used but less realistic descriptions, a step function and an exponential-like function. The experimental data are only reproduced when dissipation is considered. The influence of transient effects on the fission process, as well as the deduced value of the dissipation strength P, depends strongly on the approximation applied for the time-dependent fission-decay width. In particular, a meticulous analysis sheds severe doubts on the use of the exponential-like in-growth function. Finally, we investigate which should be the characteristics of experimental observables to be most sensitive to transient effects in fission. The pertinence of observables related to the excitation energy at saddle is discussed. (c) 2005 Elsevier B.V. All rights reserved.
机译：通过分析实验数据仔细地检查了在裂变中出现瞬态效应的条件，在实验数据中，相对论能量周围的重离子碰撞引起了裂变。将U-238在1 A GeV时在金和铀靶上的实验性总核裂变截面与核反应代码的预测进行了比较，在核反应代码中，对裂变的瞬态效应采用了与时间相关的随时间变化的裂变衰减数值的近似模型宽度：基于Fokker-Planck方程解的新分析描述和两个使用广泛但不太现实的描述，即阶跃函数和指数函数。仅在考虑耗散时才复制实验数据。瞬变效应对裂变过程的影响以及耗散强度P的推论值在很大程度上取决于应用于随时间变化的裂变衰减宽度的近似值。特别是，细致的分析使人们对使用像指数一样的增长函数产生了严重的怀疑。最后，我们研究了对裂变的瞬态效应最敏感的实验观测物的特征。讨论了与鞍座处的激发能有关的可观察物的相关性。 （c）2005 Elsevier B.V.保留所有权利。

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