0820037

This proposal is a one of three accompanying proposals aimed on obtaining legacy-level observational datasets on the Milky Way Galactic disk. The ultimate goal of the entire project (which started in AO4 and which we plan to continue it in subsequent AOs) is to have model independent and systematics free measurements of the fluxes in nuclear lines (511 keV annihilation emission 1.8 MeV 26Al and 1.17 MeV and 1.33 MeV 60Fe lines) and a broad band spectrum of the Galactic background emission which at different energies is provided either by cumulative emission of faint Galactic source or by interaction of low energy cosmic rays with interstellar medium. Our strategy was supported by INTEGRAL TACs during previous AOs and now we propose to continue the coverage of the Galactic disk with scanning observations. Taking into account the unique combination of properties of INTEGRAL instruments - broad band coverage large fields of view and possibilities to eliminate the contribution of descrete sources from the total measured photon flux the proposed strategy is the best possible usage of the valuable INTEGRAL time.In this proposal we ask for 2 Msec observations of Galactic region at l=-22.5 deg which will be complimentary to the already performed observations of the inner Galaxy at l~40 22.5 and -45 deg. Having two model-independent systematics free and symmetric (l=+/- 22.5 deg) measurements of the 511 keV annihilation line flux we will put strong constrains on symmetry of line emission. This proposal will provide complimentary data to the accepted AO6 KP proposal of G. Weidenspointner (ID: 06K0003) which scans the Galaxy along the plane. [truncated! Please see actual data for full text]