Assertion: neutron's energy | /r/HasProperty | b d \displaystyle b_{d
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text: The latter can be directly measured by measuring the energy ( B d {\displaystyle B_{d}} ) of the single 0.7822 MeV gamma photon emitted when neutrons are captured by protons (this is exothermic and happens with zero-energy neutrons), plus the small recoil kinetic energy ( E r d {\displaystyle E_{rd}} ) of the deuteron (about 0.06% of the total energy).