Entrance-channel dependence of fission-fragment anisotropies: A direct experimental signature of fission before equilibration.
Entrance-channel dependence of fission-fragment anisotropies: A direct experimental signature of fission before equilibration.
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裂变碎片各向异性的入口通道依赖性：平衡前裂变的直接实验特征。
DOI：
10.1103/physrevlett.65.25
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发表时间：
1990
影响因子：
8.6
通讯作者：
Navīn
中科院分区：
文献类型：
--
作者：
Ramamurthy;Kapoor;Choudhury;Saxena;Nadkarni;Mohanty;Nayak;Sastry;Kailas;Chatterjee;M. S. Singh;Navīn
测量了{sup 10}B、{sup 12}C、{sup 16}O+{sup 232}Th、{sup 237}Np和{sup 19}F+{sup 237}Np反应的裂变碎片角分布。虽然在B和C诱导裂变中测得的各向异性与标准Halpern-Strutinsky理论的预测一致，但在O和F诱导裂变的情况下，它们非常大。相对于入口通道质荷不对称性的角各向异性的这种不连续行为提供了对先前提出的用于解释异常碎片角分布的预平衡裂变模型的预测的实验验证。
Fission-fragment angular distributions in reactions of {sup 10}B, {sup 12}C, {sup 16}O+{sup 232}Th and {sup 237}Np, and {sup 19}F+{sup 237}Np have been measured. While the measured anisotropies in B- and C-induced fission are found to be in agreement with the predictions of the standard Halpern-Strutinsky theory, they are anomalously large in the case of O- and F-induced fission. Such a discontinuous behavior in angular anisotropy with respect to the entrance-channel mass-to-charge asymmetry provides an experimental verification of the predictions of the preequilibrium fission model proposed earlier to explain the anomalous fragment angular distributions.