Igor Tamm

Igor Yevgenyevich Tamm (Russian: И́горь Евге́ньевич Тамм; 8 July 1895 – 12 April 1971) was a Sovietphysicist who received the 1958 Nobel Prize in Physics, jointly with Pavel Cherenkov and Ilya Frank, for their 1934 discovery and demonstration of Cherenkov radiation. He also predicted the quasi-particle of sound: the phonon; and in 1951, together with Andrei Sakharov, proposed the Tokamak system.