A small subatomic particle was passed through large water tank containing Cd. The existence of this particle was inferred when two γ-rays were produced and a neutron was captured by Cd. The particle was :
A
proton
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B
anti neutrino
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C
electron
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D
neutrino
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Solution
The correct option is D neutrino Neutrinos with an energy above the thresholdcaused charged current decay interactions with the protons in the water, producing neutrons and γ rays.