9 research outputs found
Longitudinal kinematic imbalances in (anti-)neutrino interactions for improved measurements of nuclear removal energies and the axial vector form factor
Current and future accelerator neutrino oscillation experiments require an
improved understanding of nuclear effects in neutrino-nucleus interactions. One
important systematic uncertainty is given by potential mismodeling of the
removal energy, which biases the reconstruction of the neutrino energy. In this
manuscript, we introduce a novel observable for accelerator neutrino
oscillation experiments, the visible longitudinal momentum imbalance,
reconstructed in charged current quasi-elastic interactions from the outgoing
charged lepton and nucleon. Minimally dependent on the neutrino energy and
directly sensitive to the removal energy distribution, we demonstrate a method
to constrain the latter. Further, we show how the use of the longitudinal
imbalance in anti-neutrino interactions in a target containing hydrogen allows
for an improved, high-purity selection of the interactions on hydrogen. This
approach offers the potential for precise measurements of the nuclear axial
vector form factor as well as of the anti-neutrino flux.Comment: 9 pages, 9 figure
Demonstration of particle tracking with scintillating fibres read out by a SPAD array sensor and application as a neutrino active target
Scintillating fibre detectors combine sub-mm resolution particle tracking,
precise measurements of the particle stopping power and sub-ns time resolution.
Typically, fibres are read out with silicon photomultipliers (SiPM). Hence, if
fibres with a few hundred mm diameter are used, either they are grouped
together and coupled with a single SiPM, losing spatial resolution, or a very
large number of electronic channels is required. In this article we propose and
provide a first demonstration of a novel configuration which allows each
individual scintillating fibre to be read out regardless of the size of its
diameter, by imaging them with Single-Photon Avalanche Diode (SPAD) array
sensors. Differently from SiPMs, SPAD array sensors provide single-photon
detection with single-pixel spatial resolution. In addition, O(us) or faster
coincidence of detected photons allows to obtain noise-free images. Such a
concept can be particularly advantageous if adopted as a neutrino active
target, where scintillating fibres alternated along orthogonal directions can
provide isotropic, high-resolution tracking in a dense material and reconstruct
the kinematics of low-momentum protons (down to 150 MeV/c), crucial for an
accurate characterisation of the neutrino nucleus cross section. In this work
the tracking capabilities of a bundle of scintillating fibres coupled to
SwissSPAD2 is demonstrated. The impact of such detector configuration in
GeV-neutrino experiments is studied with simulations and reported. Finally,
future plans, including the development of a new SPAD array sensor optimised
for neutrino detection, are discussed
Influence of Wrapping on the Light Output of BGO
We measured the effect of 14 different wrapping materials on the light output and energy resolution of a Bismuth Germanate scintillating crystal. Most of the wrappings increased the light output significantly with respect to the bare crystal. Using 3M Vikuiti™ ESR foil, we achieved almost triple the light output of the unwrapped crystal
Longitudinal kinematic imbalances in (anti-)neutrino interactions for improved measurements of nuclear removal energies and the axial vector form factor
International audienceCurrent and future accelerator neutrino oscillation experiments require an improved understanding of nuclear effects in neutrino-nucleus interactions. One important systematic uncertainty is given by potential mismodeling of the removal energy, which biases the reconstruction of the neutrino energy. In this manuscript, we introduce a novel observable for accelerator neutrino oscillation experiments, the visible longitudinal momentum imbalance, reconstructed in charged current quasi-elastic interactions from the outgoing charged lepton and nucleon. Minimally dependent on the neutrino energy and directly sensitive to the removal energy distribution, we demonstrate a method to constrain the latter. Further, we show how the use of the longitudinal imbalance in anti-neutrino interactions in a target containing hydrogen allows for an improved, high-purity selection of the interactions on hydrogen. This approach offers the potential for precise measurements of the nuclear axial vector form factor as well as of the anti-neutrino flux
Longitudinal kinematic imbalances in (anti-)neutrino interactions for improved measurements of nuclear removal energies and the axial vector form factor
Current and future accelerator neutrino oscillation experiments require an improved understanding of nuclear effects in neutrino-nucleus interactions. One important systematic uncertainty is given by potential mismodeling of the removal energy, which biases the reconstruction of the neutrino energy. In this manuscript, we introduce a novel observable for accelerator neutrino oscillation experiments, the visible longitudinal momentum imbalance, reconstructed in charged current quasi-elastic interactions from the outgoing charged lepton and nucleon. Minimally dependent on the neutrino energy and directly sensitive to the removal energy distribution, we demonstrate a method to constrain the latter. Further, we show how the use of the longitudinal imbalance in anti-neutrino interactions in a target containing hydrogen allows for an improved, high-purity selection of the interactions on hydrogen. This approach offers the potential for precise measurements of the nuclear axial vector form factor as well as of the anti-neutrino flux
The impact of nuclear effect modelling on the cross-section ratio Ve/VÎĽ and its impact for future measurements of CP violation
ISSN:1824-803
Demonstration of particle tracking with scintillating fibres read out by a SPAD array sensor and application as a neutrino active target
Scintillating fibre detectors combine sub-mm resolution particle tracking, precise measurements of the particle stopping power and sub-ns time resolution. Typically, fibres are read out with silicon photomultipliers (SiPM). Hence, if fibres with a few hundred ÎĽ m diameter are used, either they are grouped together and coupled with a single SiPM, losing spatial resolution, or a very large number of electronic channels is required. In this article we propose and provide a first demonstration of a novel configuration which allows each individual scintillating fibre to be read out regardless of the size of its diameter, by imaging them with Single-Photon Avalanche Diode (SPAD) array sensors. Differently from SiPMs, SPAD array sensors provide single-photon detection with single-pixel spatial resolution. In addition, O(us) or faster coincidence of detected photons allows to obtain noise-free images. Such a concept can be particularly advantageous if adopted as a neutrino active target, where scintillating fibres alternated along orthogonal directions can provide isotropic, high-resolution tracking in a dense material and reconstruct the kinematics of low-momentum protons (down to 150 MeV/c), crucial for an accurate characterisation of the neutrino-nucleus cross section. In this work the tracking capabilities of a bundle of scintillating fibres coupled to SwissSPAD2 is demonstrated. The impact of such detector configuration in GeV-neutrino experiments is studied with simulations and reported. Finally, future plans, including the development of a new SPAD array sensor optimised for neutrino detection, are discussed.ISSN:1434-6044ISSN:1434-605
Additive manufacturing of a 3D-segmented plastic scintillator detector for tracking and calorimetry of elementary particles
Plastic-scintillator detectors are devices used for the detection of elementary particles. They provide good particle identification with excellent time resolution, whilst being inexpensive due to the affordability of plastic materials. Particle tracking is achieved by segmenting the scintillator into smaller optically-isolated 3D granular sub-structures which require the integration of multiple types of plastic materials as well as several thousands of tiny holes through a compact volume of several cubic meters. Future particle detectors necessitate larger volumes, possibly with even finer segmentation. However, manufacturing such geometries with current production strategies is challenging, as they involve time-consuming and costly fabrication processes, followed by the assembly of millions of individual parts. The difficulty in scaling up such a workflow can be addressed by additive manufacturing, enabling the construction of complex, monolithic geometries in a single operation. This article presents the fabrication of the first additive manufactured plastic scintillator detector, capable of 3D tracking elementary particles and measuring their stopping power. Its performance is comparable to the state of the art of plastic scintillator detectors. This work paves the way towards a new feasible, time and cost-effective process for the production of future plastic-based scintillator detectors, regardless their size and difficulty in geometry