Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005omeg.conf...47d&link_type=abstract
ORIGIN OF MATTER AND EVOLUTION OF GALAXIES 2003. Held 17-19 November 2003 in RIKEN, Wako, Saitama, Japan. Edited by M Terasawa,
Astronomy and Astrophysics
Astrophysics
Scientific paper
With gamma-ray measurements from the decay of radioactive isotopes of intermediate lifetimes, nucleosynthesis in stars, supernovae, and novae may be constrained. ESA's INTEGRAL observatory with its Ge spectrometer SPI is now in orbit for one year, and at least four more years are scheduled. The INTEGRAL satellite and instruments show excellent performance. Instrumental background, higher than, estimated, limits current gamma-ray line results. Nevertheless, first results on annihilation radiation and 26Al demonstrate the potential of this mission for nuclear astrophysics. The 26Al line is narrow, casting doubt on previously-reported broadening which would require typical 26Al decay at ≃ 500 km s-1 the annihilation of e+ appears concentrated in the inner Galaxy, more extended than what would correspond to the Galactic bulge, but without a significant Galactic-disk component. After its first successful mission year with emphasis on hard-X-ray sources, the second mission year is aimed more at the study of nucleosynthesis sources, with their required long exposures.
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