The γ-ray line signature of the elusive neutrino

Details The γ-ray line signature of the elusive neutrino The γ-ray line signature of the elusive neutrino

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phlb..262..307c&link_type=abstract

Physics Letters B, Volume 262, Issue 2-3, p. 307-313.

Physics

Scientific paper

A heavy triplet neutrino may still solve the astronomical missing mass conundrum provided its mass lies in the range between 30 and 80 GeV. If present in the halo of our galaxy, this Majorana neutrino anihilates into monochromatic photons. We show that the resulting γ-ray line signal is well above the diffuse galactic background, due to a fairly large value of the relevant annihilation cross-section. A 1 m2 sr effective area γ-ray detector of the ASTROGAM caliber should accumulate ~ 35 high energy photons on a year period, to be compared with a background noise of 3-6 photons - for a 5% energy resolution. We strongly urge high energy astrophysicists to explore the γ-ray sky up to energies ~ 100 GeV. Should such an intense γ-ray line be discovered, the dark matter mystery would be unravelled.
On leave absence from LAPP, B.P. 110, F-74941 Annecyle-Vieux Cedex, France and from Université de Chambéry, F-73000 Chambéry, France.

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