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  2. Nucleosynthesis - Wikipedia

    en.wikipedia.org/wiki/Nucleosynthesis

    Nucleosynthesis is the process that creates new atomic nuclei from pre-existing nucleons (protons and neutrons) and nuclei. According to current theories, the first nuclei were formed a few minutes after the Big Bang, through nuclear reactions in a process called Big Bang nucleosynthesis. [1]

  3. Alpha particle - Wikipedia

    en.wikipedia.org/wiki/Alpha_particle

    After five years of additional experimental work, Rutherford and Hans Geiger determined that "the alpha particle, after it has lost its positive charge, is a Helium atom". [7] [8] [9]: 61 Alpha radiation consists of particles equivalent to doubly-ionized helium nuclei (He 2+) which can gain electrons from passing through matter. This mechanism ...

  4. Helium - Wikipedia

    en.wikipedia.org/wiki/Helium

    The most common isotope, helium-4, is produced on Earth by alpha decay of heavier radioactive elements; the alpha particles that emerge are fully ionized helium-4 nuclei. Helium-4 is an unusually stable nucleus because its nucleons are arranged into complete shells. It was also formed in enormous quantities during Big Bang nucleosynthesis. [113]

  5. Is iSpace getting into the rare helium mining business? - AOL

    www.aol.com/news/opinion-ispace-getting-rare...

    Helium 3 is rare on Earth, primarily produced by the radioactive decay of tritium, but it does reside in abundance in the lunar regolith, deposited by billions of years of solar wind.

  6. Isotopes of helium - Wikipedia

    en.wikipedia.org/wiki/Isotopes_of_helium

    The least stable is 10 He, with half-life 260(40) yoctoseconds (2.6(4) × 10 −22 s), though 2 He may have an even shorter half-life. In Earth's atmosphere, the ratio of 3 He to 4 He is 1.343(13) × 10 −6. [5] However, the isotopic abundance of helium varies greatly depending on its origin.

  7. Helium-3 - Wikipedia

    en.wikipedia.org/wiki/Helium-3

    The partial pressure of helium in the Earth's atmosphere is about 0.52 pascals (7.5 × 10 −5 psi), and thus helium accounts for 5.2 parts per million of the total pressure (101325 Pa) in the Earth's atmosphere, and 3 He thus accounts for 7.2 parts per trillion of the atmosphere.

  8. White Christmas Forecast 2024: Here's Where The Best ... - AOL

    www.aol.com/white-christmas-forecast-2024-heres...

    The greatest Christmas snow depth in Memphis (10 inches) happened in 1963, while Tulsa's record is 6 inches in 2009. In 2020, a white Christmas was observed in Knoxville, Tennessee, (2 inches) and ...

  9. Magic number (physics) - Wikipedia

    en.wikipedia.org/wiki/Magic_number_(physics)

    Nuclei which have neutron numbers and proton numbers both equal to one of the magic numbers are called "doubly magic", and are generally very stable against decay. [13] The known doubly magic isotopes are helium-4, helium-10, oxygen-16, calcium-40, calcium-48, nickel-48, nickel-56, nickel-78, tin-100, tin-132, and lead-208.

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