Like uranium 235, element 94 would be an incredibly ... achieved a controlled and sustained nuclear fission chain reaction. During the last months of the war, a small group of scientists working ...

uranium has to be "enriched" in the U-235 isotope, which is responsible for nuclear fission. During the enrichment process the fraction of U-235 is increased from its natural level (0.72% by mass) to ...

Further investigations 2 demonstrated the existence of at least nine radioactive periods, six of which were assigned to elements beyond uranium, and nuclear ... The whole 'fission' process can ...

When was the first nuclear ... uranium is refined into higher concentrations of specific isotopes, a more powerful reaction is possible with less fuel. There are three isotopes of uranium: U-238 ...

All natural uranium mined today contains 0.720% of U-235 across the board ... U-235 isotopes had been forced to split in a nuclear chain reaction. The scientific community had to accept that natural ...

Naturally occurring uranium typically contains 0.720% U-235 ... nuclear physics, a moderator is a substance that slows down the neutrons released from fission so they can sustain a chain reaction ...