HeBurning-2 - HELIUM BURNING! Tessa Casanova - Chad Delfino...

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HELIUM BURNING!Tessa Casanova- Chad Delfino-Felipe AlarconAqueous GeochemistryFall 2016
OVERVIEWNucleosynthesisProton-proton fusionTriple Alpha ReactionCNO CycleApplications
NUCLEAR FUSION
NUCLEAR FUSIONNuclear fusion is the process of lightnuclei combining to form heavier nuclei.For elements lighter than iron, thisprocess liberates energy.The fusion of elements heavier than irontakes energy rather than gives energy.Stars are therefore powered by thefusion of elements lighter than iron,particularly of hydrogen.
PROTON-PROTON FUSION
INTRODUCTION PP FUSIONThis is the nuclear fusion process which fuelsthe Sun and other stars which have coretemperatures less than 15 million Kelvin.A reaction cycle yields about 25 MeV of energy.This fusion reaction drives the sun’s radiance.Inside stars like the sun, the extremetemperature rips atoms into their components:protons, neutrons and electrons.
PP-FUSION SUMMARYNEUTRINOPOSITRONIONIZEDPROTONSDEUTERIUMDEUTERIUMHELIUM-3HELIUM-4HELIUM-3
STEP 1: PROTON FUSESIn the proton-proton fusion reaction, first twoprotons fuse.IONIZEDPROTONS
STEP 2. DEUTERIUM FORMATIONUsually the pair breaks apart againimmediately, but once in a while one of theprotons is transmuted into a neutron.The resulting proton-neutron pair isdeuterium, a type of hydrogen. Also, apositron and a neutrino are emitted.NEUTRINOPOSITRONDEUTERIUM
STEP 3: DEUTERIUM-PROTONFUSIONThen, another proton collideswith the deuterium nucleus,forming a helium-3 nucleus(two protons and a neutron)plus a gamma ray.Gamma rays eventually worktheir way up from the core ofthe sun and out into space inthe form of sunlight.

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Term
Fall
Professor
Mark Ford
Tags
Chemistry, Geochemistry, Geology, Nuclear Fusion, Positron, Deuterium, triple alpha process, PP FUSION

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