Ghost particle refers to NEUTRINO.
Neutrinos are the subatomic particles that are created by certain nuclear reactions.
Neutrinos are called " ghost particles " because
1. They have no electric charge.
2. They interact very weakly with matter.
3. They can pass through solid objects almost undisturbed.
As a result, neutrinos are extremely difficult to detect, earning them the nickname " ghost particle ".
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