Nukleosintesis: Perbedaan antara revisi

[[Nukleosintesis Big Bang nucleosynthesis]] occurredterjadi withinpada thetiga firstmenit threepertama minutespenciptaan ofalam thesemesta beginningdan ofbertanggung thejawab universeatas andbanyak isperbandingan responsible for much of the abundance ratios ofkelimpahan ¹H ([[hydrogen-1atom hidrogen|protium]]), ²H ([[deuterium]]), ³He ([[helium-3]]), anddan ⁴He ([[helium-4]]), indi the universealam semesta<ref>{{dead link|url=http://www.astro.washington.edu/research/bbn/|date=March 2009}} Big Bang Java Calculator v1.1, Craig Hogan, Luis Mendoza</ref>.

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Although ⁴He continues to be produced by other mechanisms (such as stellar fusion and alpha decay) and trace amounts of ¹H continue to be produced by [[spallation]] and certain types of radioactive decay ([[proton emission]] and [[neutron emission]]), most of the mass of these isotopes in the universe, and all but the insignificant traces of the ³He and deuterium in the universe produced by rare processes such as [[cluster decay]], are thought to have been produced in the [[Big Bang]]. The nuclei of these elements, along with some ⁷Li, and ⁷Be are believed to have been formed when the universe was between 100 and 300 seconds old, after the primordial [[quark]]-[[gluon]] plasma froze out to form [[proton]]s and [[neutron]]s. Because of the very short period in which Big Bang nucleosynthesis occurred before being stopped by expansion and cooling, no elements heavier than [[lithium]] could be formed. (Elements formed during this time were in the plasma state, and did not cool to the state of neutral atoms until much later).