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发表刊物：Physics Letters B
关键字：Nuclear fission, entanglement entropy, sawtooth structure
摘要：Nuclear fission presents a unique example of quantum entanglement in strongly interacting many-body systems. A heavy nucleus can split into hundreds of combinations of two complementary fragments in the fission process. The entanglement of fragment wave functions is persistent even after separation and impacts the partition of particles and energies between fragments. Based on microscopic dynamical calculations of the fission of 240Pu, this work finds that dynamical quantum entanglement is indispensable in the appearance of sawtooth distributions of average excitation energies of fragments and thus neutron multiplicities, but not in average neutron excess of fragments. Both sawtooth slopes from particle-number projections are found to be steep -- a feature which can be alleviated by random fluctuations. The persistent entanglement is mainly due to non-adiabatic dynamics since the final splitting is so fast that the non-localization of wave functions is kept during the separation. These findings may impact the understanding of quantum entanglement more broadly in mesoscopic systems.
合写作者：Kyle Godbey
第一作者：Yu Qiang
论文类型：期刊论文
通讯作者：JunChen Pei
一级学科：物理学
文献类型：期刊
卷号：861
页面范围：139248
是否译文：否
发表时间：2025-01-07
收录刊物：SCI
发布期刊链接：https://doi.org/10.1016/j.physletb.2025.139248