Cosmological gamma-rays from the decay of fourth family neutrinos - Possibility and constraints

Details Cosmological gamma-rays from the decay of fourth family neutrinos - Possibility and constraints Cosmological gamma-rays from the decay of fourth family neutrinos - Possibility and constraints

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...256..351c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 256, no. 2, p. 351-353.

Astronomy and Astrophysics

Astrophysics

3

Cosmology, Gamma Ray Spectra, Neutrinos, Universe, Evolution (Development), Gamma Ray Telescopes

Scientific paper

A fourth-family neutrino, nu4, when sufficiently massive, is allowed by the LEP/SLC results. We find that the nu4 radiative decay in the early universe may yield a bump or spike in the spectrum of the extragalactic gamma-ray background, around 10-100 MeV. From the existing data, we estimate, with large uncertainties, loose constraints on the nu4 properties, which may of some value for the future observations. The spike/bump feature, if observed with the new generation of gamma-ray telescopes, would strongly support the existence of the fourth generation of neutrinos.

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