The Astronomy and Astrophysics Decal Survey
Nuclear physics offers us a powerful tool: using nuclear resonance absorption lines to infer the physical conditions in astrophysical settings which are otherwise diffcult to deduce. Present-day technology provides an increase in sensitivity over previous gamma-ray missions large enough to utilize this tool for the ﬁrst time. The most exciting promise is to measure gamma-ray bursts from the ﬁrst star(s) at redshifts 20–60, but also active galactic nuclei are promising targets.
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