A systematic analysis of the experimental cross-section data in odd mass number $\left(A\right)$ and odd atomic number $\left(Z\right)$ nuclei is reported to reveal a novel mass-energy systematics for the pre-compound emission of fast neutrons in $\alpha$-induced reactions at low energies. The experimental excitation functions have been analyzed within the framework of statistical model predictions to get information regarding pre-compound emission. The present analysis establishes for first time an interesting systematics, emphasizing that accessible excitation energy on peripheral nucleons of the systems is an exponential function of atomic mass number ($A$) of target nuclei. One of the most important features of this systematics is to provide a precise estimation of the pre-compound contribution for any nuclei, except closed-shell ones, over a wide range of mass number $63\le A\le 109$ in the nuclear landscape. New results of the present analysis emphasize an additional subtle interconnection between the structure of nuclei and the nuclear reaction mechanism of the pre-compound emission process at low energies, where the compound nucleus process is more likely to be dominant.

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开发用于预化合物发射的质能系统学的新实验方法

奇数质量数实验截面数据的系统分析 $\left(\mathrm{一种}\right)$ 和奇原子序数 $\left(Z\right)$ 据报道，原子核揭示了一种新的质能系统学，用于快速中子的预复合发射 $\alpha$- 低能诱导反应。已经在统计模型预测的框架内分析了实验激发函数，以获得关于预化合物发射的信息。目前的分析首次建立了一个有趣的系统学，强调系统外围核子上的可用激发能量是原子质量数的指数函数（$\mathrm{一种}$) 的目标核。该系统学最重要的特征之一是在很宽的质量数范围内提供对任何核（闭壳核除外）的预化合物贡献的精确估计$63\le \mathrm{一种}\le 109$在核领域。本分析的新结果强调了原子核结构与低能下预化合物发射过程的核反应机制之间的额外微妙联系，其中复合核过程更有可能占主导地位。