A limit on massive neutrino dark matter from Kamiokande

Physics

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Scientific paper

We have searched for possible high-energy neutrino signals expected from massive neutrino dark matter captured by the earth and the sun, by making use of upward-going muon samples collected in the seven years of operation of the Kamiokande detector. No excess of events was found from the earth or the sun, thus giving an excluded mass range of Dirac-(Majorana-) type neutrinos, 6 (24) <=mν<= several hundred GeV, as the dark matter which consitutes the halo of the galaxy. The upper bounds extend to a mass range never before analyzed in previous indirect searches.
Present address: NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA.

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