Electronul are o sarcină electrică negativă. Fisiunea și fuziunea nucleară Fizicianul Fermi a fost primul cercetător care și-a dat seama că neutronii pot fi utilizați. Reacția nucleară este un proces studiat de fizica și chimia nucleare care constă din ciocnirea Se pot enumera reacțiile de fuziune sau fisiune nucleară. Procesul triplu-alfa este un set de reacții de fuziune nucleară prin care trei nuclee de heliu-4 (particule alfa) sunt transformați în carbon. Stelele mai vechi.

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Nuclear fusion is an important natural process: Many chemical elements originate from hydrogen through fusion; fusion is the energy source of the sun and stars. Fusion in the sun The sun is the basis of all life on earth: This huge plasma ball consists mainly of hydrogen.

A constant fusion fire burns in its core, where the hydrogen atomic nuclei merge into helium. The enormous energy produced in this nuclear fusion is what heats and lights the fuziinea.


Under terrestrial conditions it is the two hydrogen isotopes, deuterium and tritium, that fuse most readily. In the process a helium nucleus is produced, this being accompanied by release of a neutron and large quantities of useful energy: One gram of fuel could generate 90, kilowatt-hours of energy in a power plant — the combustion heat of 11 tonnes of coal. Fusion fuels are cheap and uniformly distributed fuziunae earth.

Seawater contains deuterium in almost inexhaustible quantities. Tritium, a radioactive gas with a short half-life of It can, however, be formed in a power plant from lithium, which is likewise abundantly available.

Fuziunea. Fisiunea nucleara. Reactorul nuclear. by Herisanu Luiza on Prezi

Since, moreover, a fusion power plant will have ecologically favourable properties, fusion could make an enduring contribution to future energy supply. Home Energy Source Fusion basics What is nuclear fusion? What mucleara nuclear fusion? A Fusion Power Plant For millions of years, the sun has been shining and giving off virtually inexhaustible amounts of energy.

Procesul triplu-alfa

Its source was long a puzzle to scientists: A slowly cooling magma? Impossible, given the age of the sun!


William Thomson asked in Does the sun’s own gravity make it contract? Does this compression produce heat and light?

Nuclara Eddington realised The proton-proton reaction was finally described by Hans Bethe in Gradually, the atomic nuclei of hydrogen fuse into a helium nucleus, which is lighter than the four original nuclei. Every second, million tonnes of hydrogen ‘burn’ in the sun’s core and become million tonnes of helium Every second, the sun loses four million tonnes of its mass.

Since the birth of the sun 4. Despite the high temperature and extreme pressure — 15 million degrees and billion atmospheres — fusion in the sun is very slow. For a power plant on nucleeara, a faster reaction is chosen: Open in new window.

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