0420073

We propose a VERY long (4-6 Msec) project of repeated latitude scans of a selected region of the Galactic Disk outside the central bulge. The rapid latitude scans are intended to minimize any possible systematics associated with the SPI and ISGRI detectors background variations thus providing a clean emission spectrum of this portion of the Galactic disk limited only by the photon counting statistics.The ultimate goal is to have a model independent measurements of the disk positron annihilation emission 1.8 MeV Al26 and 1.17 MeV and 1.33 MeV Fe60 lines fluxes and a broad band spectrum of the Galactic Ridge emission believed to be due to weak compact X-ray sources and Cosmic Rays at low and high energies respectively. The proposed strategy is the only reliable way to achieve these goals without hitting the systematics limit.A further comparison of these data with the existing deep observations of the central Galactic Bulge would address the most fundamental questions facing the INTEGRAL: i) clarify the role of stellar nucleosynthesis in the production of positrons and the relation between the Galactic Disk and Bulge ii) place tight constraints on the fate of the positrons iii) allow a detailed comparison between Al26 and Fe60 nuclear lines emission and star formation rate in the disk iv) provide robust conclusion on the nature of the hard Ridge emission. As a secondary science we anticipate discovery of a number of new extragalactic objects in very interesting region of thelocal Universe -- the Great Attractor. The proposed observations making the best possible use of the INTEGRALcapabilities and will remain an extremely valuable source ofinformation on the High Energy properties of the Milky Way for decadesto come. [truncated! Please see actual data for full text]