Cecil Frank Powell was a British experimental physicist who received the Nobel Prize in Physics in 1950 for heading the team that developed the photographic method of studying nuclear processes, and for the resulting discovery of the pion (pi-meson). The Nobel Prize in Physics 1950, announced November 10, 1950. Cecil Powell, “for his development of the photographic method of studying nuclear processes and his discoveries regarding mesons made with this method”. Cecil Powell: born 1903, Tonbridge, United Kingdom. Wiki link Data: the Nobel Foundation (CC0).