In general, nuclear fusion happens at a higher temperature for heavier elements. In my astrophysics class we derived an equation for probability of nuclear reactions, and without quoting it exactly, it boils down to have this probability proportional to exp(-m(adsbygoogle = window.adsbygoogle || []).push({}); _{r}Z_{1}Z_{2}), where m_{r}is the reduced mass of colliding particles, Z_{n}are the atomic numbers.

So how come then, that deuterium burning occurs at roughly 10^{6}K while regular hydrogen burns at 10^{7}K?

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# Why does deuterium burn at lower temperature than H

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