0632000

We propose a deep 6 Ms exposure of the Cygnus X region as a multi-year INTEGRAL key program in order to answer a number of central questions related to stellar nucleosynthesis and positron production and diffusion. Cygnus X is the most nearby massive star forming region in our Galaxy housing several tens of OB associations and massive star clusters at a distance of approximately ~1.5 kpc. The proximity of the region brings gamma-ray line emission from individual star clusters in reach of the SPI telescope and the spatial extent of ~10 degrees of Cygnus X allows to resolve their contributions. The proposed exposure builds on existing observations of roughly ~4.6 Ms of this region. We present analysis results based on the existing observations and illustrate that an additional 6 Ms exposure will allow for a breakthrough in nucleosynthesis and positron annihilation science. [truncated! Please see actual data for full text]