Determination of the Neutrino Mass Hierarchy via the Phase of the Disappearance Oscillation Probability with a Monochromatic \barν_e Source

Details Determination of the Neutrino Mass Hierarchy via the Phase of the Disappearance Oscillation Probability with a Monochromatic \barν_e Source Determination of the Neutrino Mass Hierarchy via the Phase of the Disappearance Oscillation Probability with a Monochromatic \barν_e Source

2007-01-19

arxiv.org/abs/hep-ph/0701151v2

Phys.Rev.D76:053004,2007; Erratum-ibid.D76:079901,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

23 pages, 10 figures, final published version, title changed

Scientific paper

10.1103/PhysRevD.76.053004

The neutrino mass hierarchy can be determined, in principle, by measuring a phase in the disappearance oscillation probability in vacuum, without relying on the matter effect, using a single channel. This phase is not the same for the normal and inverted neutrino mass spectra. In this paper, we give a complete description and physics understanding of the method. The key feature of the method is to detect advancement (normal) or retardation (inverted) of the phase of the atmospheric-scale oscillation relative to the solar-scale oscillation. We then show that this method can be realized with the recently proposed resonant $\bar{\nu}_{e}$ absorption reaction enhanced by M\"ossbauer effect. The unique feature of this setup is the ultra-monochromaticity of the observed \bar{\nu}_{e}'s. Because of this feature the phase advancement or retardation of atmospheric-scale neutrino oscillation is detectable after 20 or more oscillations if the source and the target are made sufficiently compact in size. A quantitative estimate of the sensitivity to mass hierarchy resolution is given. We have also examined how a possible continuation of such experiment can be carried out in order also to achieve high precision (few %) determination of the solar-scale oscillation parameters \Delta m^2_{21} and \theta_{12}.

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