Fusion reaction hydrogen burning

The nuclear reaction that finally stabilizes the structure of the protostar is the fusion of two protons to form a deuterium atom, a positron, and a neutrino (1 H(p,p+v)2D). This reaction becomes important at a temperature of a few million degrees. The newly produced deuterium then bums to 3He, which in turn bums to 4He in the proton-proton chain. The proton-proton chain is the main source of nuclear energy in the Sun. With the initiation of hydrogen burning... 

Our beloved sun that warms up the Earth from above burns hydrogen in a cycle of fusion reactions that was discovered by Hans Bethe, a German scientist who received the Nobel Prize in physics in 1967 for his understanding of nucleosynthesis in the sun. 

Stellar Fusion The sun s energy source was a mystery to people for a long time. One 19th-century astronomer calculated that if the sun were made entirely of coal, it would burn for only about 10 000 years. Today, it is known that the sun s fuel is hydrogen, consumed in fusion reactions in which helium is formed. After the sun has used up nearly all of its hydrogen, it is expected to begin a fusion reaction in which helium-4 nuclei combine to form carbon-12. Write a nuclear equation for this process, and verify that it is balanced. 

This is the fastest hydrogen-burning reaction and, since 2H is significantly abundant in seawater and can be readily isolated, is the reaction most likely to used for terrestrial power generation by nuclear fusion. 

The role of the C and N isotopes, then, is simply to catalyze the fusion of four protons into one He plus two neutrinos and two positrons. Because the slow reaction in the CN cycle is the capture of a proton by N, the CN cycle tends to concentrate most C and N isotopes into this isotope. N is, along with He, one of the principal products of hydrogen burning. 

Calculate the mass of octane, CsHi8(/), that must be burned in air to evolve the same quantity of energy as produced by the fusion of 1.0 g of hydrogen in the following fusion reaction ... 

When 10% of the hydrogen in the core has been consumed gravitational contraction again occurs until at a temperature of 2 X 10 K helium burning (fusion) can occur. This is followed by a similar depletion, contraction and temperature rise until nuclear reactions involving... 

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