Identifying Earth matter effects on supernova neutrinos at a single detector

Dighe, Amol S. ; Keil, Mathias Th. ; Raffelt, Georg G. (2003) Identifying Earth matter effects on supernova neutrinos at a single detector Journal of Cosmology and Astroparticle Physics, 2003 (06). Article ID 006. ISSN 1475-7516

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The neutrino oscillations in Earth matter introduce modulations in the supernova neutrino spectra. These modulations can be exploited to identify the presence of Earth effects on the spectra, which would enable us to put a limit on the value of the neutrino mixing angle θ13 and to identify whether the mass hierarchy is normal or inverted. We demonstrate how the Earth effects can be identified at a single detector without prior assumptions about the flavour-dependent source spectra, using the Fourier transform of the `inverse-energy' spectrum of the signal. We explore the factors affecting the efficiency of this method, and find that the energy resolution of the detector is the most crucial one. In particular, whereas water Cherenkov detectors may need a few ten thousand events to identify the Earth effects, a few thousand may be enough at scintillation detectors, which generically have a much better energy resolution. A successful identification of the Earth effects through this method can also provide Δm2 to a good accuracy. The relative strength of the detected Earth effects as a function of time provides a test for supernova models.

Item Type:Article
Source:Copyright of this article belongs to Institute of Physics.
ID Code:101595
Deposited On:09 Mar 2018 10:26
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