Cosmic rays Cosmic Rays are energetic particles that impinge on our atmosphere. Primary Cosmlc Rays They come from all directions. When these high energy particles strike atoms/molecules in our atmosphere,they produce a spray of particles. Many“exotic”particles can be created.As long as they are not so massive as to violate energy conservation. Some of these particles are unstable and“decay”quickly into other stable particles. Any of these exotic particles can reach the surface of the earth. PDF文件使用"pdfFactory”试用版本创建ww.fineprint.cnCosmic Rays q Cosmic Rays are energetic particles that impinge on our atmosphere. q They come from all directions. qWhen these high energy particles strike atoms/molecules in our atmosphere, they produce a spray of particles. q Many “exotic” particles can be created.As long as they are not so massive as to violate energy conservation. q Some of these particles are unstable and “decay” quickly into other stable particles. q Any of these exotic particles can reach the surface of the earth. PDF 文件使用 "pdfFactory" 试用版本创建 ÿwww.fineprint.cn