I mean, wouldn't you expect the ratio of the input neutrinos to have some effect on the ratio of the output?
Yes... but how big of an effect? I'm really not sure about neutrinos, but I seem to remember that things are so dense and hot in there that photons generated in the core (where most of the fusion is going on) take on the order of hundreds or thousands of years to make their way to the surface. Now, for neutrinos, I'd expect it to be MUCH better (after all, they hardly interact) but there still might be enough interaction to slow them down some and give time to change.
Besides, 4 light minutes is a long time (well... distance, but distance and time have the same units anyway) on an atomic scale, so perhaps it's large in comparison to the neutrino conversion time.
Of course keep in mind here that I have only an undergraduate degree in physics and even that is seriously outdated, so I probably have no idea what I'm talking about.
-- Michael Chermside
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