Competition Between Quasi-Molecular Resonances and Fusion–Fission in Light Dinuclear Systems

摘要

The results presented in this paper clearly suggest that a coherent framework may exist which connects the topics of heavy-ion molecular resonances, hyperdeformation effects, and fission shape isomerism. New data on particle-particle-γ triple coincidences of the ²⁸Si+²⁸Si reaction at a beam energy corresponding to the population of a conjectured J^π = 38⁺ resonance in ⁵⁶Ni are presented. The absence of alignment of the spins of the outgoing fragments with respect to the orbital angular momentum is found to be in contrast with the alignment as measured for the ²⁴Mg+²⁴Mg resonances. A molecular-model picture is presented to suggest a “butterfly” motion of two oblate ²⁸Si nuclei interacting in a equator-to-equator molecular configuration.