Don’t have the physics in front of me and my memory isn’t what it used to be, the resonance capture aspect of U238 made the reactions virtually circular. My former supervisor, a brilliant man, told me about it. The theory explains, in part, hydrocarbons.
I will take your memory as factual. I am a neophyte, with no training in higher sciences. It fascinates me how theories are taught as facts, making them as solid to most scientists, as a slab of granite.