633 research outputs found
Magic Baseline Beta Beam
We study the physics reach of an experiment where neutrinos produced in a
beta-beam facility at CERN are observed in a large magnetized iron calorimeter
(ICAL) at the India-based Neutrino Observatory (INO). The CERN-INO distance is
close to the so-called "magic" baseline which helps evade some of the parameter
degeneracies and allows for a better measurement of the neutrino mass hierarchy
and .Comment: 4 pages, 2 figures, Latex (style files included); Talk presented by
S.K.A. at the International workshop on Theoretical High Energy Physics
(IWTHEP 2007), Roorkee, India, 15-20 March, 2007, to appear in the
proceeding
Minimal Neutrino Beta Beam for Large theta_13
We discuss the minimum requirements for a neutrino beta beam if theta_13 is
discovered by an upcoming reactor experiment, such as Double Chooz or Daya Bay.
We require that both neutrino mass hierarchy and leptonic CP violation can be
measured to competitive precisions with a single-baseline experiment in the
entire remaining theta_13 range. We find that for very high isotope production
rates, such as they might be possible using a production ring, a (B,Li) beta
beam with a gamma as low as 60 could already be sufficient to perform all of
these measurements. If only the often used nominal source luminosities can be
achieved, for example, a (Ne,He) beta beam from Fermilab to a possibly existing
water Cherenkov detector at Homestake with gamma \sim 190-350 (depending on the
Double Chooz best-fit) could outperform practically any other beam technology
including wide-band beam and neutrino factory.Comment: 11 pages, 2 figures, 1 tabl
Probe of anomalous neutrino couplings to W and Z in medium energy setup of a beta-beam facility
Capability of medium energy setup of a beta beam experiment to probe new
physics contributions to neutrino-W and neutrino-Z couplings are investigated.
We employ the effective lagrangian approach of Buchmuller and Wyler and obtain
95% confidence level limits on neutrino couplings to these gauge bosons without
assuming the flavor universality of the coupling of neutrinos. We show that a
beta beam facility can place 3 to 20 times more restrictive limits than present
ones on the deviations from the electron neutrino couplings in the Standard
Model.Comment: 22 pages, 10 figure
Physics Reach of the Beta Beam
Beta Beams are designed to produce pure (anti)electron neutrino beams and
could be an elegant and powerful option for the search of leptonic CP violating
processes. In this paper will be quantified the physics reach of a CERN based
Beta Beam and of a Super Beam - Beta Beam combination. The CP phase
sensitivity results to be comparable to a Neutrino Factory for
values greater than .Comment: Invited talk at the Nufact02 Workshop, Imperial College of Science,
Technology and Medicine, London, July 200
Physics and optimization of beta-beams: From low to very high gamma
The physics potential of beta beams is investigated from low to very high
gamma values and it is compared to superbeams and neutrino factories. The gamma
factor and the baseline are treated as continuous variables in the optimization
of the beta beam, while a fixed mass water Cherenkov detector or a totally
active scintillator detector is assumed. We include in our discussion also the
gamma dependence of the number of ion decays per year. For low gamma, we find
that a beta beam could be a very interesting alternative to a superbeam
upgrade, especially if it is operated at the second oscillation maximum to
reduce correlations and degeneracies. For high gamma, we find that a beta beam
could have a potential similar to a neutrino factory. In all cases, the
sensitivity of the beta beams to CP violation is very impressive if similar
neutrino and anti-neutrino event rates can be achieved.Comment: 34 pages, 16 figures, Fig. 2 modified, discussion improved, refs.
added, version to appear in PR
Optimized Two-Baseline Beta-Beam Experiment
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.Comment: 17 pages, 3 eps figures. Minor changes, matches version accepted in
JHE
Low-energy neutrinos at off-axis from a standard beta-beam
We discuss a scenario to extract up to 150 MeV neutrinos at a standard
beta-beam facility using one and two detectors off-axis. In particular we show
that the high-energy component of the neutrino fluxes can be subtracted through
a specific combination of the response of two off-axis detectors. A systematic
analysis of the neutrino fluxes using different detector geometries is
presented, as well as a comparison with the expected fluxes at a low-energy
beta-beam facility. The presented option could offer an alternative way to
perform low-energy neutrino experiments.Comment: 9 pages, 6 figure
What about a beta-beam facility for low energy neutrinos?
A novel method to produce neutrino beams has recently been proposed : the
beta-beams. This method consists in using the beta-decay of boosted radioactive
nuclei to obtain an intense, collimated and pure neutrino beam. Here we propose
to exploit the beta-beam concept to produce neutrino beams of low energy. We
discuss the applications of such a facility as well as its importance for
different domains of physics. We focus, in particular, on neutrino-nucleus
interaction studies of interest for various open issues in astrophysics,
nuclear and particle physics. We suggest possible sites for a low energy
beta-beam facility.Comment: 4 pages, 1 figur
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