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Question
What does 'low-neutron' mean?
Low-neutron means most of the fusion energy emerges as charged particles, not neutrons. Kronos's neutron fraction is ~5.25% — about 25× below deuterium–tritium.
"Low-neutron" is the single most important — and most carefully chosen — phrase in the Kronos story. The full explanation is on does D–³He produce neutrons? and is Kronos fusion aneutronic?
Questions & answers
What does Kronos mean by 'low-neutron'?
That only a small fraction of the fusion energy is carried by neutrons — about 5.25% at the Kronos design point, versus roughly 80% for a deuterium–tritium plant. Most of the energy instead emerges as charged particles, which can be captured directly as electricity.
Is 'low-neutron' the same as 'aneutronic'?
No, and Kronos is careful about the difference. 'Aneutronic' means no neutrons at all; 'low-neutron' means few. Because side deuterium–deuterium reactions produce some neutrons, a real D–³He plant is low-neutron, not aneutronic. Only the gated p–¹¹B endpoint is truly aneutronic.
Why does the label matter?
Precision is credibility. Overstating neutron performance is a common way fusion claims lose trust; 'low-neutron' is accurate and still a major advantage.