Primordial He accompanies only “strange” Xe (Xe-2 ) Xe-1 = “ Normal ” xenon occurs in the inner Elemental abundances of primordial He linked with excess Xe-136 in “strange” Xe (Xe-2 ) was the first clear evidence that elements and isotopes never mixed in the supernova debris that formed the solar system [ Trans. Missouri Academy Sci. 9 (1975) pages 104-122]. |
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