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arXiv 0909.1059nucl-ex
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裂变核和不对称自由度对fission -碎片产额奇偶结构的作用判别

Discrimination between roles of fissioning nucleus and asymmetry degree of freedom on the even-odd structure in fission-fragment yields

M. Caamano, F. Rejmund, K. -H. Schmidt

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摘要：

基于低能裂变测量的裂变碎片分布的广泛系统，研究了裂变碎片元素产额的奇偶交错。全球的奇偶效应与裂变系统的公认的演变被发现只是一个部分方面的奇偶结构。事实上，研究表明，全局偶奇效应随着裂变碎片分布的平均不对称性而系统地变化，并且偶奇交错随着不对称性的普遍增加取决于裂变系统。因此，奇偶效应对裂变系统的依赖性部分地归因于电荷分布的不对称演化，而不仅仅像以前那样与耗散能量有关。这一解释得到了逆运动学测量数据的有力支持，这些数据涵盖了完整的电荷分布，并包括对称性下的精确产率。探讨了序参量作为一般性质来描述裂变碎片产率中的奇偶效应的相关性。

英文摘要：

Based on a wide systematics of fission-fragment distributions measured in low-energy fission, the even-odd staggering in the fission-fragment element yields is investigated. The well-established evolution of the global even-odd effect with the fissioning system is found to be only a partial aspect of the even-odd structure. Indeed, it is shown that the global even-odd effect is varying systematically with the mean asymmetry of the fission-fragment distribution, and that the general increase of the even-odd staggering with asymmetry is depending on the fissioning system. Thus, the dependency of the even-odd effect with the fissioning system is accredited in part to the asymmetry evolution of the charge distribution, and not solely related to the dissipated energy as it has been done earlier. This interpretation is strongly supported by data measured in inverse kinematics, which cover the complete charge distribution and include precise yields at symmetry. The relevance of the order parameter to describe the even-odd effect in fission-fragment yields as a general property is explored.

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