cherenkov
/tʃɛrɛnˈkɒf/Definitions
1. noun
a phenomenon in which a charged particle, typically an electron, gives up some of its energy as it travels through a dielectric material, such as water or glass, at a speed greater than the speed of light in that material.
“The team studied the cherenkov effect to gain a better understanding of the properties of high-energy particles.”
2. noun
a radiation produced by the interaction of a charged particle with a dielectric material.
“The scientists detected a cherenkov radiation emanating from the nuclear reactor.”