Zakopane 2026 Conference on Nuclear Physics

Recent experiments have shown that fission fragments carry intrinsic angular momentum with essentially no correlation between fragments, motivating new theoretical studies. Different microscopic models will be discussed to understand the generation of fragment spin in fission. These approaches, based on time-dependent density functional theory and a time-dependent collective Hamiltonian, investigate the origin of angular momentum during and after scission. By comparing projection techniques with simple estimates from the uncertainty principle, fragment spin is shown to emerge from the quantum uncertainty between orientation angle and angular momentum, together with the effects of fragment deformation.