Attenuation effect and neutrino oscillation tomography

Abstract

Attenuation effect is the effect of weakening of contributions to the oscillation signal from remote structures of matter density profile. The effect is a consequence of integration over the neutrino energy within the energy resolution interval. Structures of a density profile situated at distances larger than the attenuation length, ${\lambda }_{att}$, are not "seen". We show that the origins of attenuation are (i) averaging of oscillations in certain layer(s) of matter, (ii) smallness of matter effect: $\epsilon \equiv 2EV/\Delta m^2\ll 1$, where $V$ is the matter potential, and (iii) specific initial and final states on neutrinos. We elaborate on the graphic description of the attenuation which allows us to compute explicitly the effects in the ${\epsilon }^2$ order for various density profiles and oscillation channels. The attenuation in the case of partial averaging is described. The effect is crucial for interpretation of oscillation data and for the oscillation tomography of the Earth with low energy (solar, supernova, atmospheric, {\it etc.}) neutrinos.

arXiv comment24 pages, 8 figures, typos corrected, more explanations added

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Cited by in corpus (5)

• DUNE atmospheric neutrinos: Earth Tomography
• Oscillation tomography of the Earth with solar neutrinos and future experiments
• Locating the Core-Mantle Boundary using Oscillations of Atmospheric Neutrinos
• Earth tomography with supernova neutrinos at future neutrino detectors
• Tomography by neutrino pair beam