31. Together with Otto Frisch, he suggested a direct experimental proof of nuclear fission . 32. The 1938 discovery of nuclear fission aroused great interest among physicists. 33. Pu-240 exposed to alpha particles will incite a nuclear fission . 34. The opposite is true for the reverse process, nuclear fission . 35. Japanese research on nuclear fission was not so far advanced. 36. Since nuclear fission creates radioactivity, the reactor core is surrounded by a protective shield. 37. The relationships among Green, Carter, Moss and Culpepper is as complicated as nuclear fission . 38. It contained of enriched uranium, of which less than a kilogram underwent nuclear fission . 39. Nuclear fission produces energy for nuclear power and drives the explosion of nuclear weapons.40. Brown said, answering the question as if he were asked to explain nuclear fission .
