Is helium a faster propagator of fusion burn compared to hydrogen?

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SUMMARY

Helium is a faster propagator of fusion burn compared to hydrogen due to its higher mass, which influences burn propagation dynamics. The discussion highlights the importance of isotopic composition and the distinct fusion reaction cross-sections between hydrogen and helium. Conditions of the cold, dense material being ignited also play a critical role in determining burn propagation speed. Overall, the consensus is that while helium may propagate burn faster, the specific conditions and material compositions must be considered for accurate assessments.

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I am trying to determine whether a burn would propagate faster through hydrogen or helium.

My initial guess is helium due to the higher mass. I also think this is true in stars. Anyone have an idea on burn propagation and how different masses of material would affect it?

Is my first thought correct?
 
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What do you mean with propagate? Do you have some cold (well, relatively cold), dense material that gets ignited at some point? If yes, what are the conditions of this cold, dense material?
What is the isotopic composition of your hydrogen and helium?
My initial guess is helium due to the higher mass.
Why? And why did you neglect the fact that the fusion reactions and their cross-sections are completely different?
 

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