A "Collision Cascade" refers to a series of events where one collision leads to another, often seen in physics and engineering. This concept is commonly illustrated in particle physics, where a high-energy particle collides with a target, causing a chain reaction of additional collisions among particles. Each interaction can produce new particles, leading to a complex web of reactions. In the context of nuclear reactions, a collision cascade can occur when a fast-moving nucleus strikes another nucleus, resulting in the ejection of particles and further collisions. This process is crucial for understanding phenomena such as nuclear fission and the behavior of materials under extreme conditions.