File Name: fission and fusion reactions .zip
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Theory of Nuclear Fission
Uranium U is one of the isotopes that fissions easily. The process may be controlled nuclear power or uncontrolled nuclear weapons. Fission Process and Heat Production A nuclear power plant converts the energy contained within the nuclei of atoms into electrical energy. The heat released in fission can be used to help generate electricity in powerplants. The chain reaction of U is shown in the following figure.
Nuclear fusion is a reaction in which two or more atomic nuclei are combined to form one or more different atomic nuclei and subatomic particles neutrons or protons. The difference in mass between the reactants and products is manifested as either the release or the absorption of energy. This difference in mass arises due to the difference in atomic binding energy between the nuclei before and after the reaction. Fusion is the process that powers active or main sequence stars and other high-magnitude stars, where large amounts of energy are released. A fusion process that produces nuclei lighter than iron or nickel will generally release energy. These elements have relatively small mass per nucleon and large binding energy per nucleon. Fusion of nuclei lighter than these releases energy an exothermic process , while fusion of heavier nuclei results in energy retained by the product nucleons, and the resulting reaction is endothermic.
Not a MyNAP member yet? Register for a free account to start saving and receiving special member only perks. The nuclear fusion program of the United States should seek to develop this technology sufficiently for comparison with fast breeder reactors, solar power, and other long-term sources of energy. The technology must still be tested for engineering achievability, environmental characteristics, and reasonable cost. We recommend that the program pursue research on the principal physical concepts that have been advanced for nuclear fusion, and on the materials and design problems of fusion reactor technology, with attention to environmental characteristics and engineering and economic practicality whenever possible. The aim is to develop the most attractive forms of this technology on a timely schedule.
Nuclear Fission and Fusion
Fission occurs when a neutron slams into a larger atom, forcing it to excite and spilt into two smaller atoms—also known as fission products. Additional neutrons are also released that can initiate a chain reaction. Uranium and plutonium are most commonly used for fission reactions in nuclear power reactors because they are easy to initiate and control. The energy released by fission in these reactors heats water into steam. The steam is used to spin a turbine to produce carbon-free electricity.
If these neutrons are absorbed by other nuclei, this causes a chain reaction. • For the chain reaction to occur, there has to be a critical mass. o For uranium, this is.
Fission and Fusion
The energy harnessed in nuclei is released in nuclear reactions. Fission is the splitting of a heavy nucleus into lighter nuclei and fusion is the combining of nuclei to form a bigger and heavier nucleus. The consequence of fission or fusion is the absorption or release of energy. Protons and neutrons make up a nucleus, which is the foundation of nuclear science.
A nuclear reactor , formerly known as an atomic pile , is a device used to initiate and control a fission nuclear chain reaction or nuclear fusion reactions. Nuclear reactors are used at nuclear power plants for electricity generation and in nuclear marine propulsion. Heat from nuclear fission is passed to a working fluid water or gas , which in turn runs through steam turbines. These either drive a ship's propellers or turn electrical generators ' shafts. Nuclear generated steam in principle can be used for industrial process heat or for district heating.
Nuclear fusion and nuclear fission are different types of reactions that release energy due to the presence of high-powered atomic bonds between particles found within a nucleus. In fission, an atom is split into two or more smaller, lighter atoms. Fusion, in contrast, occurs when two or more smaller atoms fuse together, creating a larger, heavier atom.