Optimized Two-Baseline Beta-Beam Experiment

Abstract

We propose a realistic Beta-Beam experiment with four source ions and two baselines for the best possible sensitivity to theta_{13}, CP violation and mass hierarchy. Neutrinos from 18Ne and 6He with Lorentz boost gamma=350 are detected in a 500 kton water Cerenkov detector at a distance L=650 km (first oscillation peak) from the source. Neutrinos from 8B and 8Li are detected in a 50 kton magnetized iron detector at a distance L=7000 km (magic baseline) from the source. Since the decay ring requires a tilt angle of 34.5 degrees to send the beam to the magic baseline, the far end of the ring has a maximum depth of d=2132 m for magnetic field strength of 8.3 T, if one demands that the fraction of ions that decay along the straight sections of the racetrack geometry decay ring (called livetime) is 0.3. We alleviate this problem by proposing to trade reduction of the livetime of the decay ring with the increase in the boost factor of the ions, such that the number of events at the detector remains almost the same. This allows to substantially reduce the maximum depth of the decay ring at the far end, without significantly compromising the sensitivity of the experiment to the oscillation parameters. We take 8B and 8Li with gamma=390 and 656 respectively, as these are the largest possible boost factors possible with the envisaged upgrades of the SPS at CERN. This allows us to reduce d of the decay ring by a factor of 1.7 for 8.3 T magnetic field. Increase of magnetic field to 15 T would further reduce d to 738 m only. We study the sensitivity reach of this two baseline two storage ring Beta-Beam experiment, and compare it with the corresponding reach of the other proposed facilities.

17 pages, 3 eps figures. Minor changes, matches version accepted in JHEP

References in corpus (24)

• New features in the simulation of neutrino oscillation experiments with GLoBES 3.0
• NOvA Proposal to Build a 30 Kiloton Off-Axis Detector to Study Neutrino Oscillations in the Fermilab NuMI Beamline
• Physics potential of the CERN-MEMPHYS neutrino oscillation project
• First hint for CP violation in neutrino oscillations from upcoming superbeam and reactor experiments
• Resolving parameter degeneracies in long-baseline experiments by atmospheric neutrino data
• A low energy neutrino factory for large ${\theta }_{13}$
• MEMPHYS:A large scale water Cerenkov detector at Fréjus
• Contrasting solar and reactor neutrinos with a non-zero value of theta13
• Neutrino mass hierarchy and ${\theta }_{13}$ with a magic baseline beta-beam experiment
• A Neutrino Factory for both Large and Small theta_13
• Physics potential of T2KK: An extension of the T2K neutrino oscillation experiment with a far detector in Korea
• Alternating ions in a $\beta$-beam to solve degeneracies
• ${\nu }_{\mu }$ disappearance at the SPL, T2K-I, NO$\nu$A and the Neutrino Factory
• Detectors and flux instrumentation for future neutrino facilities
• Neutrino Oscillation Parameters After High Statistics KamLAND Results
• Optimizing the greenfield Beta-beam
• Unraveling neutrino parameters with a magical beta-beam experiment at INO
• Can R-parity violating supersymmetry be seen in long baseline beta-beam experiments?
• Combining CPT-conjugate Neutrino channels at Fermilab
• An intermediate gamma beta-beam neutrino experiment with long baseline
• Exceptional Sensitivity to Neutrino Parameters with a Two Baseline Beta-Beam Set-up
• Neutrino parameters from matter effects in $P_{ee}$ at long baselines
• Neutrino oscillations: what is magic about the "magic" baseline?
• Probing Lepton Number Violating Interactions with Beta-beams

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• Systematic uncertainties in long-baseline neutrino oscillations for large ${\theta }_{13}$
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• On the improvement of the low energy neutrino factory
• Requirements for a New Detector at the South Pole Receiving an Accelerator Neutrino Beam
• A minimal Beta Beam with high-Q ions to address CP violation in the leptonic sector
• EUROnu-WP6 2010 Report
• Search for CP violation in the lepton sector