Search for nucleosynthetic and cosmic-ray induced γ-ray lines from the Galactic plane.

Details Search for nucleosynthetic and cosmic-ray induced γ-ray lines from the Galactic plane. Search for nucleosynthetic and cosmic-ray induced γ-ray lines from the Galactic plane.

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26as..120c.343h&link_type=abstract

Astronomy and Astrophysics Supplement, v.120, p.343-347

Astronomy and Astrophysics

Astrophysics

10

Nuclear Reactions, Nucleosynthesis, Abundances, Ism: Cosmic Rays, Galaxy: Abundances, Gamma-Rays: Observations

Scientific paper

We have combined all OSSE spectra of the central radian of the Galaxy obtained through the end of 1994. These data have been searched for evidence of diffuse emission of nucleosynthetic γ-ray lines (^22^Na, 1.275MeV: ^60^Fe, 1.17 and 1.33MeV) and cosmic-ray induced γ-ray lines (de-excitation of ^12^C*, 4.44MeV, and of ^16^O*, 6.13MeV). We have looked in detail at possible systematic errors in the line measurements. Our preliminary results show no evidence for the presence of either broad or narrow cosmic-ray induced lines, nor for emission from ^22^Na, down to 3σ upper limits =~2x10^-4gamma/(cm^2^.sec.rad). We find weak evidence (=~2σ) of ^60^Fe line emission from positive Galactic longitudes in the central radian.

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