|
Andrew M. Davis is a professor of Astronomy and Geophysical Sciences at the University of Chicago.〔(Faculty profile )〕 He is the son of American chemist and physicist Raymond Davis, Jr., a Nobel Prize in Physics laureate. His main field of study is the origin of the elements by stellar nucleosynthesis. He currently is the head of a project to build a new instrument called the ion nanoprobe, which will allow isotopic and chemical analysis at finer scales than any contemporary instrument. He is also studying the cometary dust and contemporary interstellar dust returned to Earth by the Stardust spacecraft in 2006. ==Academic Research== He is conducting research about the isotopic compositions of refractory inclusions in meteorites to understand the earliest history of the Solar System. Short-lived chronometers such as the 26Al-26Mg system can resolve time differences of only a few tens of thousands of years for events that occurred 4.55 billion years ago. Isotopic fractionation effects and the relative abundances of trace elements are used to constrain thermal histories and redox conditions in the solar nebula and on the asteroidal parent bodies of meteorites. Tiny (<10 µm in diameter) grains of silicon carbide, graphite, and other refractory minerals and rocks condensed around dying stars (mostly red giant stars and supernovae) survived potentially destructive processes in the interstellar medium and during solar system formation, and can now be found in meteorites. These grains preserve an isotopic record of the nucleosynthesis in individual stars. He is measuring the isotopic compositions of these grains with a new technique, resonant ionization mass spectrometry, that was developed by his collaborators at Argonne National Laboratory. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Andrew M. Davis」の詳細全文を読む スポンサード リンク
|