Gamma ray lines from buried supernovae

The search for astronomical objects that emit nuclear γ-ray lines is a central topic of high energy Astrophysics. Supernovae (SN) have been proposed in the past in connection with nucleosynthesis. A special class of SN appears particularly promising viz. Those which are buried in dense interstellar clouds. The SN progenitor has to be an O or B-star so that its evolutionary lifetime is short, and an explosion inside the cloud is still possible. It is shown that in principle a measurement of the abundances in the ejecta is possible