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B Where do neutrons in the sun come from?

  1. Jun 29, 2017 #1
    If star start from a big ball of hidrogen and the all the neutron to make helium.
    Thx for help!
  2. jcsd
  3. Jun 29, 2017 #2


    Staff: Mentor

    That's a fair question.

    First, there was some Helium produced in the big bang, so not 100% of the first stars was Hydrrogen. But I think the real answer to your question is this:


  4. Jun 29, 2017 #3
    what is neutrion
  5. Jun 29, 2017 #4
    by the way thx for helping me understand
  6. Jun 29, 2017 #5


    Staff: Mentor

    A neutrino is a very strange particle with just a tiny bit of mass.

    See https://en.wikipedia.org/wiki/Neutrino

    There are very many kinds of subatomic particles. Do you want to learn more about them in general? If yes, I'm sure that other PF members can recommend a tutorial or a starting textbook.
  7. Jun 29, 2017 #6
    Yes pls
  8. Jun 29, 2017 #7


    Staff: Mentor

    Someone please help this person with a recommended tutorial, textbook or someplace for him to learn.
  9. Jun 29, 2017 #8
    In the Sun, deuterium-producing events are rare. Diprotons are the much more common result of proton-proton reactions within the star, and diprotons almost immediately decay back into two protons. Since the conversion of hydrogen to helium is slow, the complete conversion of the hydrogen in the core of Earth's Sun is calculated to take more than 1010 (ten billion) years.
  10. Jun 29, 2017 #9
    What is deuterium-producing
  11. Jun 30, 2017 #10


    User Avatar

    Staff: Mentor

    Deuterium is the isotope of hydrogen with one neutron and one proton. It can be produced by the reaction at the top in the diagram anorlunda posted above: two protons combine, emitting a positron and and a neutrino and turning into deuterium.
  12. Jun 30, 2017 #11
    Deuterium is produced for industrial, scientific and military purposes, by starting with ordinary water—a small fraction of which is naturally-occurring heavy water—and then separating out the heavy water by the Girdler sulfide process, distillation, or other methods.

    In theory, deuterium for heavy water could be created in a nuclear reactor, but separation from ordinary water is the cheapest bulk production process :woot:

    The world's leading supplier of deuterium was Atomic Energy of Canada Limited, in Canada, until 1997, when the last heavy water plant was shut down. Canada uses heavy water as a neutron moderator for the operation of the CANDU reactor design.
    Last edited: Jun 30, 2017
  13. Jun 30, 2017 #12
    Neutron drip and inverse beta decay are possibilities.
    But it depends of its density, nêutron drip occours above a level of density that i belive only happen in compact stars
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