Retrieving "Neutron Counting" from the archives

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1. Neutron Signal

   Linked via "neutron counting"

   Detectors relying on gas mixtures, such as those containing Boron Trifluoride ($\text{BF}_3$) or Helium-3 (isotope)/) ($\text{^3He}$), detect neutrons via charged particle production rather than delayed gamma emission:
   $$\text{n} + \text{^3He} \rightarrow \text{^1H} + \text{^3H} + 0.76 \text{ MeV}$$
   While fast, this mechanism does not produce the characteristic delayed temporal signature required for supernova tagging and is …