{"knowledge_schema": {"broad_category": "Physics \u2192 Nuclear Physics \u2192 Many-Body Interactions", "refinement": "This problem focuses on the assumptions underlying the impulse approximation in nuclear interactions, particularly regarding nucleon behavior in a nucleus.", "specific_scope": "The task is to identify which combination of assumptions allows for the simplification of nucleon interactions to that of free nucleons in the context of electroweak interactions.", "goal": "Determine the correct set of assumptions that collectively imply the impulse approximation for nucleons in a nucleus."}, "summary": "The problem involves understanding the impulse approximation in nuclear physics, which simplifies the treatment of nucleons as if they were free particles. To determine which assumptions lead to this approximation, we need to analyze how each assumption affects the interaction of nucleons within a nucleus. The goal is to identify the correct combination of assumptions that collectively imply this simplification, focusing on the interactions and conditions affecting nucleons."}