Let me rephase the question: "There is no evidence of exterrestrial He-3, e.g., meteors, lunar samples, solar wind, etc.?"
"Franta, Jaroslav" <frantaj@aecl.ca> wrote:
-----Original Message-----
From: John Jacobus [mailto:crispy_bird@yahoo.com]
Sent: Monday March 31, 2003 5:55 PM
To: Franta, Jaroslav; Radsafe (E-mail)
Subject: RE: [cdn-nucl-l] Re: giant natural nuclear reactor at the center of the EarthSo I guess we can rule out He-3 formation during the explosion of dying suns?
>>>>>>>>> Yes -- He-3 in stars is somewhat equivalent to gasoline sprinkled on a coal fire (or like U235 compared to U238) -- it burns up far more readily than the rest of the fuel.
"The explosion of dying suns" consists of shells of different types of nuclear fuels -- with hydrogen at the surface, at lowest temperature, followed by He-4, carbon, oxygen, nitrogen, magnesium, neon, silicon, etc. at progressively higher temperatures (up to some billions of Kelvins).
In fact any "primordial" He-3 left over from before star formation (as well as deuterium) is quickly burned up in the early, pre-hydrogen-burning evolutionary phase of every star (called the "T-Tauri" phase), leaving them all -- including our sun -- strongly depleted in those nuclides (at least in their cores), relative to the rest of matter in the universe.....
. . .