0520008

The goal of this proposal is to test the superbubble (SB) paradigm for the origin of radio and X-ray emission ridge contained by Loop I and Loop IV circles on the northern galactic sky at longitudes l<20 deg. and l>310 deg.. This region was found to posess a strong emission in radio waves (Haslam et al. 1971) as well as in soft X-rays (Bunner et al. 1972 Egger and Aschenbach 1995 Snowden et al. 1995 1997). The interpretation of this radio and X-ray emission remains controversial and is based on the hypothesised interaction of Loop I with Loop IV (Salter 1983) or alternatively with the Sco-Cen region wind produced bubble (Egger and Aschenbach 1995). In both cases the gamma-ray line emission from this region is expected to be strong in boundaries of contemporaneous SB models.We will use already proven capability of SPI to measure the gamma-ray line emission from the extended regions that was demonstrated by the 511 keV line study (Knodleseder et al. 2005 Weidenspointner et al. 2006) and do propose to study broad and narrow gamma-ray lines of the Loop I-Loop IV ridge. These lines have to be produced via the excitation and spallation processes on elements abundantantly produced inside SB via wind ejection by massive stars or/and ejected by supernovae explosions. These abundant elements are bombarded by the sub-relativistic cosmic rays that are expected to be accelerated in SB.These measurements will provide the first test of the theory of the Cosmic Rays injection and acceleration up to the energy of 10E15 eV/nucleon in the environment of the superbubble. [truncated! Please see actual data for full text]