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Paper   IPM / Physic / 16250
School of Physics
  Title:   Oscillation tomography of the Earth with solar neutrinos and future experiments
  Author(s): 
1.  P. Bakhti
2.  A. Smirnov
  Status:   Published
  Journal: Phys. Rev. D
  Vol.:  101
  Year:  2020
  Pages:   123031
  Supported by:  IPM
  Abstract:
We study in details the Earth matter effects on the boron neutrinos from the Sun using recently developed 3D models of the Earth. The models have a number of new features of the density profiles, in particular, a substantial deviation from spherical symmetry. In this connection, we further elaborate on relevant aspects of oscillations (ϵ2 corrections, adiabaticity violation, entanglement, etc.) and the attenuation effect. The night excesses of the νe− and νN− events and the Day-Night asymmetries, AND, are presented in terms of the matter potential and the generalized energy resolution functions. The energy dependences of the cross-section and the flux improve the resolution, and consequently, sensitivity to remote structures of the profiles. The nadir angle (η) dependences of AND are computed for future detectors DUNE, THEIA, Hyper-Kamiokande, and MICA at the South pole. Perspectives of the oscillation tomography of the Earth with the boron neutrinos are discussed. Next-generation detectors will establish the integrated day-night asymmetry with high confidence level. They can give some indications of the η− dependence of the effect, but will discriminate among different models at most at the (1 − 2)σ level. For high-level discrimination, the MICA-scale experiments are needed. MICA can detect the ice-soil borders and perform unique tomography of Antarctica.

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