Will the first commercial fusion reactor be D-T?
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https://physics.stackexchange.com/questions/318390/why-do-fusion-cross-sections-drop-after-a-certain-temperature

Anything other than D-T requires >8x higher temperatures to reach the same reactivity, resulting in orders of magnitude more radiative losses.

Why do fusion cross sections drop after a certain temperature?
The title sums everything up. The fusion cross section increases up to a certain temperature due to collisions and the increased probability of tunneling through the coulomb barrier. But why does the

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