2002/03/12 by M. Ambrosio, The MACRO Collaboration, R. Antolini +98 · 36 citations
Physics and Astronomy · #Astrophysics #Astrophysics and Cosmic Phenomena #Dark Matter and Cosmic Phenomena #Flux (metallurgy) #Measurements of neutrino speed #Muon #Muon neutrino #Neutrino #Neutrino Physics Research #Neutrino astronomy #Neutrino detector #Neutrino oscillation #Nuclear physics #Particle physics #Physics #Solar neutrino #Solar neutrino problem #astro-ph
paper · pdf · doi:10.1016/s0927-6505(02)00190-1
published in Astroparticle Physics 19(1), 1-13 (Elsevier BV) · 19 pages, 8 figures, 2 tables
arxiv created 2002/03/12 · openalex publication_date 2003/03/04 · arxiv updated 2012/08/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Many galactic and extragalactic astrophysical sources are currently considered promising candidates as high energy neutrino emitters. Astrophysical neutrinos can be detected as upward-going muons produced in charged-current interactions with the medium surrounding the detector. The expected neutrino fluxes from various models start to dominate on the atmospheric neutrino background at neutrino energies above some tens of TeV. We present the results of a search for an excess of high energy upward-going muons among the sample of data collected by MACRO during ~5.8 years of effective running time. No significant evidence for this signal was found. As a consequence, an upper limit on the flux of upward-going muons from high-energy neutrinos was set at the level of 1.7 10^(-14) cm^(-2) s^(-1) sr^(-1). The corresponding upper limit for the diffuse neutrino flux was evaluated assuming a neutrino power law spectrum. Our result was compared with theoretical predictions and upper limits from other experiments.