Question: When water is placed near an intense neutron source, the neutrons can be slowed down to almost zero speed by collisions with the water molecules,

When water is placed near an intense neutron source, the neutrons can be slowed down to almost zero speed by collisions with the water molecules, and are eventually captured by a hydrogen nucleus to form the stable isotope called deuterium, 21H, giving off a gamma ray. What is the energy of the gamma ray?

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