Fusion Fuel Reactivity Explorer

Not every fusion fuel burns the same. This simulator plots the Maxwellian-averaged reactivity ⟨σv⟩(T) for the four fuel cycles that matter for real reactors — deuterium-tritium, deuterium-deuterium, deuterium-helium-3 and aneutronic proton-boron-11 — as glowing 3D curves derived from each reaction's Gamow energy (computed from its actual reduced mass and charge product, not looked up from a table). Drag the temperature slider and a marker slides along the selected curve while an instanced plasma-core cloud on the right brightens and pulses with the live fusion rate; the density slider and readouts turn that reactivity into an actual power density, showing why D-T dominates near-term reactors while p-¹¹B stays a distant, radiation-lean goal.