发表机构
National Centre for Nuclear Research（国家核研究中心）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
针对$^{236}$U裂变，结合有限温度配对与多维断点谱分析，揭示配对淬灭边界附近对破缺开启高-$K$通道，颈部快速断裂作为非绝热冻结，使高-$K$投影绝热保留为碎片自旋，且总角动量守恒。
AI 中文摘要
裂变碎片自旋的起源问题仍未解决。针对$^{236}$U裂变，我们将依赖形变的有限温度配对与多维裂变断点谱分析相结合。在配对淬灭边界附近，对破缺暴露出近费米高-$\Omega$侵入轨道，并开启高-$K$通道。由此产生的最大谱学容量范围从几个到超过十几个$\hbar$单位。颈部快速断裂表现为非绝热投影冻结，其中配对充当动力学门控：其临界衰减不产生角动量，但允许已有的高-$K$投影以绝热方式保留为局部碎片-$K$分量，同时总角动量保持守恒。
英文摘要
The origin of fission-fragment spin remains unresolved. For $^{236}$U fission, we combine deformation-dependent finite-temperature pairing with a multidimensional scission-spectrum analysis. Near the pairing-quenching boundary, pair breaking exposes near-Fermi high-$Ω$ intruder orbitals and opens high-$K$ channels. The resulting maximum spectroscopic capacities range from a few to more than a dozen units of $\hbar$. Rapid neck rupture acts as a non-adiabatic projection freeze-out, where pairing serves as a dynamical gate: its critical attenuation does not generate angular momentum but allows existing high-$K$ projections to be retained diabatically as local fragment-$K$ components while total angular momentum remains conserved.
