A cascade producing multiple secondary particles from an initial energetic interaction. Its observed multiplicity depends on which particles reach the detector and on detection efficiency.
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A particle shower, often referred to as an "electromagnetic shower" or "hadronic shower," is a cascade of particles that occurs when a high-energy particle, such as a cosmic ray or a high-energy photon, interacts with matter. The phenomenon can happen in various contexts, including: 1. **Electromagnetic Showers**: These occur when a high-energy photon or electron interacts with matter and produces a cascade of secondary particles.