发表机构
University of Zagreb; Lawrence Livermore National Laboratory; Lawrence Berkeley National Laboratory; Université de Toulouse（萨格勒布大学; 劳伦斯利弗莫尔国家实验室; 劳伦斯伯克利国家实验室; 图卢兹大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究结合微观与统计反应理论，首次给出239Pu(n,f)裂变碎片能量分辨的自旋和宇称分布，并量化其对瞬发光子多重性的影响，展示无参数微观输入的预测能力。
AI 中文摘要
裂变碎片诞生时快速旋转，但这种自旋随激发能的演化及其对裂变观测量的影响在很大程度上仍属未知。结合最先进的微观和统计反应理论，我们模拟了完整的裂变过程——从初始态，经过断点，到碎片衰变——并报告了在$^{239}$Pu(n,f)反应中产生的碎片的首次微观、能量分辨的自旋和宇称分布。从热能到$E_n = 10$ MeV，单个碎片的自旋非单调演化，追踪其形变。宇称含量在热能时强烈非统计性，在整个范围内与自旋保持相关。我们首次量化了微观自旋-宇称分布对瞬发光子多重性的影响，展示了无参数微观输入的预测潜力。
英文摘要
Fission fragments are born rotating rapidly, but the evolution of this spin with excitation energy and its impact on fission observables remain largely unknown. Combining state-of-the-art microscopic and statistical reaction theory, we simulate the full fission process - from the initial state, through scission, to fragment decay - and report the first microscopic, energy-resolved spin and parity distributions of the fragments produced in $^{239}$Pu(n,f). From thermal energy to $E_n = 10$ MeV, the spin of individual fragments evolves non-monotonically, tracking their deformation. The parity content, strongly non-statistical at thermal energy, remains correlated with spin throughout this range. For the first time, we quantify the impact of microscopic spin-parity distributions on prompt photon multiplicities, demonstrating the predictive potential of parameter-free microscopic inputs.
Comments7 pages, 4 figures, Supplemental Material
