What are generations of nuclear weapons?

Although there are no official definitions of different generations of nuclear weapons, historians and analysts of weapons control often recognize four general categories, each of which represents considerable technological progress during the last. The nuclear weapons are tending to develop every phase and rarely skip the phase, with the exception of the first time. These phases are 1) fissile bombs of the weapon type, 2) fission bombs type Implosi, 3) fusion bombs and 4) mirv (more independently targetable reentry vehicle) supplied nuclear weapons. Note how there is no unified principle of organization for this system; The difference between the first and second is based on the detonation method, the second and third type of bomb and the third and fourth delivery system. The design of a weapon type bomb means its Opprinzip Erating is one piece of enriched uranium running in another as a cannon. When both units of uranium combine, they reach critical mass and start the reaction of the nuclear chain. The result is a nuclear explosion like those bThe atomic bombing of Hiroshima during atomic bombing during World War II killed 140,000 people.

Implown -type nuclear weapons improve the efficiency of weapons weapons by surrounding uranium with an explosive lens, which is designed to direct their energy inside and compact uranium. As a result, more uranium is consumed in the chain reaction instead of disintegrating without fission, resulting in a higher yield. The United States has been developed by nuclear weapons of the implication of the first nuclear weapons such as weapons. A nuclear bomb, which was dropped to Nagasaki just three days after the bombing of Hiroshima Was based on the design type of Implog, which made it more compact and lighter.

Despite incremental improvement on fission weapons such as the use of a small fusion reaction to the yield increase, is another big step up in the destruction of nuclear weapons achievedThanks with a bomb. Instead of cleavage (breaking) of uranium or Plutonia core, the fusion bomb connects light elements (hydrogen) and release excessive energy during explosion. This is the same process that drives the sun. Most modern nuclear weapons are of a fusion type because the revenue is much higher than the best fission weapons.

After the position of numerous fusion bombs, there was no further steps that could be taken to increase the yield of these weapons, so the focus has moved to the development of delivery methods that the potential enemy would not be able to face. This has led to the development of the Mirv supply, while the ballistic rocket with a nuclear tip is the Laun-Nked of the atmosphere, and releases 6-8 independently of the vehicle's reentry to ramp on neighboring goals. Since this nuclear reentry of the vehicle is traveling at extreme speeds, it is about Mach 23, blocking or diversion is essentially impossible for current technologies.