5,759 research outputs found
Prospects of measuring and the sign of with a massive magnetized detector for atmospheric neutrinos
The pattern of oscillation parameters emerging from current experimental data
can be further elucidated by the observation of matter effects. In contrast to
planned experiments with conventional neutrino beams, atmospheric neutrinos
offer the possibility to search for Earth-induced matter effects with very long
baselines. Resonant matter effects are asymmetric on neutrinos and
anti-neutrinos, depending on the sign of . In a three-generation
oscillation scenario, this gives access to the mass hierarchy of neutrinos,
while the size of the asymmetry would measure the admixture of electron
neutrinos to muon/tau neutrino oscillations (the mixing angle ).
The sensitivity to these effects is discussed after the detailed simulation of
a realistic experiment based on a massive detector for atmospheric neutrinos
with charge identification. We show how a detector, which measure and
distinguish between and charged current events, might
be sensitive to matter effects using atmospheric neutrinos, provided the mixing
angle is large enough.Comment: (8 pages, 8 figures, submitted to Eur.Phys.J.C
On particle production for high energy neutrino beams
Analytical formulae for the calculation of secondary particle yields in p-A
interactions are given. These formulae can be of great practical importance for
fast calculations of neutrino fluxes and for designing new neutrino beam-lines.
The formulae are based on a parameterization of the inclusive invariant cross
sections for secondary particle production measured in p-Be interactions. Data
collected in different energy ranges and kinematic regions are used. The
accuracy of the fit to the data with the empirical formulae adopted is within
the experimental uncertainties. Prescriptions to extrapolate this
parameterization to finite targets and to targets of different materials are
given. The results obtained are then used as an input for the simulation of
neutrino beams. We show that our approach describes well the main
characteristics of measured neutrino spectra at CERN. Thus it may be used in
fast simulations aiming at the optimisation of the proposed long-baseline
neutrino beams at CERN and FNAL. In particular we will show our predictions for
the CNGS beam from CERN to Gran Sasso.Comment: 18 pages, 10 figures. Submitted to The European Physics Journal
A new concept for streamer quenching in resistive plate chambers
In this paper we propose a new concept for streamer quenching in Resistive Plate Chambers (RPCs). In our approach, the multiplication process is quenched by the appropriate design of a mechanical structure inserted between the two resistive electrodes. We show that stable performance is achieved with binary gas mixtures based on argon and a small fraction of isobutane. Fluorocarbons, deemed responsible for the degradation of the electrode inner surface of RPC detectors, are thus fully eliminated from the gas mixture. This design {also resulted} in a simplified assembly procedure. Preliminary results obtained with a few prototypes of ``Mechanically Quenched RPCs'' and some prospects for future developments are discussed
Identifying the Neutrino mass Ordering with INO and NOvA
The relatively large value of established recently by the Daya
Bay reactor experiment opens the possibility to determine the neutrino mass
ordering with experiments currently under construction. We investigate
synergies between the NOvA long-baseline accelerator experiment with
atmospheric neutrino data from the India-based Neutrino Observatory (INO). We
identify the requirements on energy and direction reconstruction and detector
mass for INO necessary for a significant sensitivity. If neutrino energy and
direction reconstruction at the level of 10% and 10 degree can be achieved by
INO a determination of the neutrino mass ordering seems possible around 2020.Comment: 18 pages, 8 figures, minor improvements and clarifications, new panel
in fig. 7, version to appear in JHEP, typo in eq. 4 correcte
Deviation of Atmospheric Mixing from Maximal and Structure in the Leptonic Flavor Sector
I attempt to quantify how far from maximal one should expect the atmospheric
mixing angle to be given a neutrino mass-matrix that leads, at zeroth order, to
a nu_3 mass-eigenstate that is 0% nu_e, 50% nu_mu, and 50% nu_tau. This is done
by assuming that the solar mass-squared difference is induced by an
"anarchical" first order perturbation, an approach than can naturally lead to
experimentally allowed values for all oscillation parameters. In particular,
both |cos 2theta_atm| (the measure for the deviation of atmospheric mixing from
maximal) and |U_e3| are of order sqrt(Delta m^2_sol/Delta m^2_atm) in the case
of a normal neutrino mass-hierarchy, or of order Delta m^2_sol/Delta m^2_atm in
the case of an inverted one. Hence, if any of the textures analyzed here has
anything to do with reality, next-generation neutrino experiments can see a
nonzero cos 2theta_atm in the case of a normal mass-hierarchy, while in the
case of an inverted mass-hierarchy only neutrino factories should be able to
see a deviation of sin^2 2theta_atm from 1.Comment: 12 pages, no figures, references and acknowledgments adde
Neutrino hierarchy from CP-blind observables with high density magnetized detectors
High density magnetized detectors are well suited to exploit the outstanding
purity and intensities of novel neutrino sources like Neutrino Factories and
Beta Beams. They can also provide independent measurements of leptonic mixing
parameters through the observation of atmospheric muon-neutrinos. In this
paper, we discuss the combination of these observables from a multi-kton iron
detector and a high energy Beta Beam; in particular, we demonstrate that even
with moderate detector granularities the neutrino mass hierarchy can be
determined for values greater than 4.Comment: 16 pages, 7 figures. Added a new section discussing systematic errors
(sec 5.2); sec.5.1 and 4 have been extended. Version to appear in EPJ
Test of large area glass RPCs at the DA Phi NE Test Beam Facility (BTF)
Abstract The CaPiRe program has been started to develop a new detector design, in order to produce large areas of glass Resistive Plate Chambers (RPC) detectors, overcoming the previous limitations. As a first step we produced our glass RPC detectors ( 1 m 2 ) at General Tecnica exploiting their standard procedures, materials and production techniques simply using 2 mm glass electrodes instead of the bakelite ones. A set of RPC was produced by using pre-coated (silk screen printed) electrodes, while others were produced with the standard graphite coating. All the detectors, together with four old Glass RPC acting as reference, were tested at the DA Φ NE Test Beam Facility with 500 MeV electrons in order to study the efficiency in different positions inside the detectors (i.e. near spacers and edges) and to study the detector behavior as a function of the local particle rate
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