The leptonic CP phase from muon decay at rest with two detectors

We propose a novel experimental setup for the determination of the leptonic CP-violating phase δ using the decay at rest (DAR) of μ + from a single source located at distances of 10 and 30 km from two 20 kton organic liquid scintillator detectors. The μ + are created by bombarding a target with a 9 mA beam of 800 MeV protons. With this proposal δ can be determined with a precision of 20 (15) degrees in 6 (12) years. In contrast with the DAE δ ALUS project, only a single source is required and it runs with a duty factor limited only by maintenance requirements. As a result 9 mA is the maximum instantaneous current, greatly reducing both the technological challenges and the costs