CP Violation in Neutrino Oscillations without Antineutrinos: Energy Dependence

TL;DR

This paper explores how energy dependence in neutrino oscillation probabilities can help determine CP violation, neutrino mass hierarchy, and mixing angles using a hybrid electron capture and beta+ decay setup.

Contribution

It introduces a novel hybrid experimental approach combining electron capture and beta+ decay to enhance sensitivity to neutrino properties.

Findings

Energy dependence allows separation of CP violation and mass hierarchy effects.

Hybrid setup improves sensitivity to mixing angles and CP phase.

Different boosts and baselines optimize experimental reach.

Abstract

The next generation of long baseline neutrino oscillation experiments will aim at determining the unknown mixing angle $\theta_{13}$, the type of neutrino mass hierarchy and CP-violation. We discuss the separation of these properties by means of the energy dependence of the oscillation probability and we consider an hybrid setup which combines the electron capture and the $\beta^+$ decay from the same radioactive ion with the same boost. We study the sensitivity to the mixing angle and the CP-phase, the CP discovery potential and the reach to determine the type of neutrino mass hierarchy. The analysis is performed for different boosts and baselines. We conclude that the combination of the two decay channels, with different neutrino energies, achieves remarkable results.