Abstract
Taking the established nonzero value of $\theta_{13}$, we study the possibility of extracting the Dirac CP-violating phase by a beta beam facility with a boost factor $100<\gamma<450$. We compare the performance of different setups with different baselines, boost factors and detector technologies. We find that an antineutrino beam from $^6$He decay with a baseline of $L=1300$ km has a very promising CP discovery potential using a 500 kton Water Cherenkov (WC) detector. Fortunately this baseline corresponds to the distance between FermiLAB to Sanford underground research facility in South Dakota.
Highlights
The developments in neutrino physics in recent 15 years have been overwhelmingly fast
We focus on a 500 kton water Cherenkov (WC) detector and compare its performance with a 50 kton totaly active scintillator detector (TASD)
Measuring the CP-violating phase by a beta beam facility has been extensively studied in the literature
Summary
The developments in neutrino physics in recent 15 years have been overwhelmingly fast. The endpoints are higher so as to have neutrino beams with energies Eν < 1.5 GeV, the values of γ should be lower than in the case of 18Ne/6He. On the other hand, the flux at the detector drops as γ −2 so with the 8Li and 8B isotopes, the number of decays should be larger to compensate for the γ −2 suppression.
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