nucleochronology
/ˌnjuːklɪəʊkrəˈnɒlədʒi/Astronomy
noun
The study of relative abundances of nuclear species as a means of dating stages in stellar nucleosynthesis. Also: a series of nuclear species arranged in the supposed chronological order of their synthesis within a star, etc.
Origin
1970s; earliest use found in Astrophysical Journal. From nucleo- + chronology.