二に次じ粒りゅう子し

noun

secondary particle

Technical term in physics for a particle produced by the interaction of primary radiation or particles with matter.

• 宇う宙ちゅう線せんが大たい気きと衝しょう突とつすると、二に次じ粒りゅう子しが発はっ生せいする。

  When cosmic rays collide with the atmosphere, secondary particles are produced.