Effect of shell structure on the fission of sub-lead nuclei

摘要: Fission of atomic nuclei often produces mass asymmetric fragments. However, the origin this asymmetry was believed to be different in actinides and sub-lead region [Andreyev et al., Phys. Rev. Lett. 105, 252502 (2010)]. It has recently been argued that quantum shell effects stabilizing pear shapes fission fragments could explain observed asymmetries [Scamps Simenel, Nature 564, 382 (2018)]. This interpretation is tested using microscopic mean-field calculations based on Hartree-Fock approach with BCS pairing correlations. The evolution number protons neutrons mercury isotope fissions interpreted terms deformed gaps A new method proposed investigate dominant prefragments at scission. We conclude mechanisms responsible for are same as actinide region, which a strong indication their universality.