Discussion Overview
The discussion focuses on the He-3(n,p)H-3 reaction and its implications for measuring fusion rates through neutron counting, particularly in the context of D-D fusion reactions. Participants explore whether the absorption of neutrons by He-3 should be considered in fusion rate calculations and under what conditions it might be negligible.
Discussion Character
- Technical explanation
- Debate/contested
Main Points Raised
- One participant questions the impact of the He-3(n,p)H-3 reaction on neutron count measurements for fusion rates, seeking clarity on when to consider He-3's neutron absorption.
- Another participant suggests that the relevance of the cross-section indicates that He-3 absorption must be accounted for in calculations.
- A later reply notes that the He-3(n,p)H-3 reaction has a very low microscopic cross-section, less than 1 barn above 1 MeV, and is primarily a thermal neutron absorber, implying a low probability of occurrence and suggesting that neutrons are more likely to escape the plasma.
Areas of Agreement / Disagreement
Participants express differing views on the necessity of accounting for He-3 absorption in fusion rate calculations. While some acknowledge the low cross-section and probability of the reaction, others emphasize the importance of considering it based on cross-section relevance.
Contextual Notes
The discussion highlights the dependence on specific conditions such as neutron energy and density, which may influence the relevance of the He-3(n,p)H-3 reaction in fusion rate measurements.