Proteus Posted December 22, 2009 Share Posted December 22, 2009 How much more abundant are protons in the universe than neutrons? Merged post follows: Consecutive posts merged(Forgot to set instant email notification.) Link to comment Share on other sites More sharing options...
Mr Skeptic Posted December 22, 2009 Share Posted December 22, 2009 A lot. Most of the universe is hydrogen (and apparently dark matter, whatever that is). Link to comment Share on other sites More sharing options...
ajb Posted December 22, 2009 Share Posted December 22, 2009 6:1 ratio of protons to neutrons or so. I think estimates vary slightly, but this is theoretically what one would expect. Link to comment Share on other sites More sharing options...
insane_alien Posted December 22, 2009 Share Posted December 22, 2009 and it can vary considerably as you can convert a proton to a neutron and vice versa. Link to comment Share on other sites More sharing options...
ajb Posted December 22, 2009 Share Posted December 22, 2009 The ration 3:1 has also been quoted to me (I expect the figure I gave first is the "freeze out ratio" about 1 second after the BB). Link to comment Share on other sites More sharing options...
swansont Posted December 23, 2009 Share Posted December 23, 2009 and it can vary considerably as you can convert a proton to a neutron and vice versa. But only in a bound state or situation where you have additional energy. Free neutrons are, of course, unstable. So stellar and planetary matter will have more neutrons. Interstellar hydrogen will not. The question becomes, which comprises more mass in the universe? From ajb's answer, it sounds like interstellar hydrogen wins. Link to comment Share on other sites More sharing options...
Proteus Posted December 23, 2009 Author Share Posted December 23, 2009 Hm, that would be another interesting ratio: that of normal (ie, not dark) matter in stars compared to interstellar normal matter. Link to comment Share on other sites More sharing options...
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