Generation of Fragment Angular Momentum in Fission,Physical Review Letters

当前位置： X-MOL 学术 › Phys. Rev. Lett. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Generation of Fragment Angular Momentum in Fission
Physical Review Letters ( IF 8.1 ) Pub Date : 2021-08-05 , DOI: 10.1103/physrevlett.127.062502
Jørgen Randrup ₁ , Ramona Vogt _{2,

3}

Affiliation

A recent analysis of experimental data [J. Wilson et al., Nature (London) 590, 566 (2021)] found that the angular momenta of nuclear fission fragments are uncorrelated. Based on this finding, the authors concluded that the spins are therefore determined only after scission has occurred. We show here that the nucleon-exchange mechanism, as implemented in the well-established event-by-event fission model freya, while agitating collective rotational modes in which the two spins are highly correlated, nevertheless leads to fragment spins that are largely uncorrelated. This counterexample invalidates the conclusion in [J. Wilson et al.] that uncorrelated spins must necessarily have been generated after scission (a potentious conclusion that would rule out all models that generate the fragment spins prior to scission). Furthermore, it was reported [J. Wilson et al.] that the mass dependence of the average fragment spin has a sawtooth structure. We demonstrate that such a behavior naturally emerges when shell and deformation effects are included in the moments of inertia of the fragments at scission.

中文翻译：

裂变中碎片角动量的产生

实验数据的最新分析 [J. 威尔逊等人。, Nature (London) 590 , 566 (2021)] 发现核裂变碎片的角动量是不相关的。基于这一发现，作者得出结论，因此只有在发生断裂后才能确定自旋。我们在这里展示了核子交换机制，如在完善的逐事件裂变模型freya 中实现的那样，同时搅动两个自旋高度相关的集体旋转模式，但会导致基本上不相关的碎片自旋。这个反例使[J. 威尔逊等人。] 不相关的自旋一定是在断裂后产生的（一个有力的结论会排除所有在断裂前产生碎片自旋的模型）。此外，据报道[J. 威尔逊等人。]平均碎片自旋的质量依赖性具有锯齿结构。我们证明，当壳和变形效应包含在断裂时碎片的惯性矩中时，这种行为自然会出现。

更新日期：2021-08-05

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11