Fission can be induced when y-rays are absorbed by a heavy nucleus. What energy y-rays are necessary to induce fission
(a) 235U, (b) 238U, (c) 239pu?
Photo fission is fission of a nucleus induced by the absorption of a gamma-ray photon. In principle photo fission is merely a more complicated form of photonuclear reaction, where the ejectile is also nucleus.