A Monochromatic Neutrino Beam for U(e3) and CP-Phase

TL;DR

This paper proposes a novel method to generate a monochromatic neutrino beam using electron capture decay of radioactive ions, enabling precise measurement of neutrino mixing parameters and CP violation.

Contribution

It introduces a new neutrino source technique based on electron capture decay, enhancing the ability to study neutrino oscillations and CP violation with high precision.

Findings

Monochromatic neutrino beams can be produced via boosted radioactive ions.

The method allows separation of mixing angle θ13 and CP-violating phase δ.

The facility has impressive potential to discover new physics in neutrino oscillations.

Abstract

The goal for future neutrino facilities is the determination of the $[U_{e3}]$ mixing and CP violation in neutrino oscillations. This will require precision experiments with a very intense neutrino source. Here a novel method to create a monochromatic neutrino beam based on the recent discovery of nuclei that decay fast through electron capture is discussed. The boost of such radioactive ions will generate a monochromatic directional neutrino beam when decaying at high energy in a storage ring with long straight sections. We show that the capacity of such a facility to discover new physics is impressive, so that the principle of energy dependence in the oscillation probability of the $\nu_e \to \nu_{\mu}$ channel is operational to separate out the two parameters of the mixing $\theta_{13}$ and of the CP-violating phase $\delta$.