25,044 research outputs found
gSeaGen: The KM3NeT GENIE-based code for neutrino telescopes
No full textThe gSeaGen code is a GENIE-based application developed to efficiently generate high statistics samples of events, induced by neutrino interactions, detectable in a neutrino telescope. The gSeaGen code is able to generate events induced by all neutrino flavours, considering topological differences between track-type and shower-like events. Neutrino interactions are simulated taking into account the density and the composition of the media surrounding the detector. The main features of gSeaGen are presented together with some examples of its application within the KM3NeT project
Contributions of KM3NeT to ICRC2023
No full textThis document collects the contributions of the KM3NeT collaboration to the
ICRC2023 conference, held from July 26 to August 3, 2023, in Nagoya, Japan.
KM3NeT submitted 38 contributions to ICRC2023, on neutrino- and multimessenger
astronomy, neutrino oscillation physics, cosmic ray physics, searches for dark
matter and exotics, calibration, technical detector descriptions, and art.
Proceedings are published in Proceedings of Science.Comment: 306 pages, many figures. Collection of proceedings contributions to
ICRC2023, published in PoS(ICRC2023), https://pos.sissa.it/444
Combined sensitivity of JUNO and KM3NeT/ORCA to the neutrino mass ordering
No full textThis article presents the potential of a combined analysis of the JUNO and KM3NeT/ORCA experiments to determine the neutrino mass ordering. This combination is particularly interesting as it significantly boosts the potential of either detector, beyond simply adding their neutrino mass ordering sensitivities, by removing a degeneracy in the determination of ∆m231 between the two experiments when assuming the wrong ordering. The study is based on the latest projected performances for JUNO, and on simulation tools using a full Monte Carlo approach to the KM3NeT/ORCA response with a careful assessment of its energy systematics. From this analysis, a 5σ determination of the neutrino mass ordering is expected after 6 years of joint data taking for any value of the oscillation parameters. This sensitivity would be achieved after only 2 years of joint data taking assuming the current global best-fit values for those parameters for normal ordering.peerReviewe
Sensitivity of the KM3NeT/ARCA neutrino telescope to point-like neutrino sources
No full textKM3NeT will be a network of deep-sea neutrino telescopes in the Mediterranean Sea. The KM3NeT/ARCA detector, to be installed at the Capo Passero site (Italy), is optimised for the detection of high-energy neutrinos of cosmic origin. Thanks to its geographical location on the Northern hemisphere, KM3NeT/ARCA can observe upgoing neutrinos from most of the Galactic Plane, including the Galactic Centre. Given its effective area and excellent pointing resolution, KM3NeT/ARCA will measure or significantly constrain the neutrino flux from potential astrophysical neutrino sources. At the same time, it will test flux predictions based on gamma-ray measurements and the assumption that the gamma-ray flux is of hadronic origin. Assuming this scenario, discovery potentials and sensitivities for a selected list of Galactic sources and to generic point sources with an E-2 spectrum are presented. These spectra are assumed to be time independent. The results indicate that an observation with 3 sigma significance is possible in about six years of operation for the most intense sources, such as Supernovae Remnants RX J1713.7-3946 and Vela Jr. If no signal will be found during this time, the fraction of the gamma-ray flux coming from hadronic processes can be constrained to be below 50% for these two objects. (C) 2019 The Authors. Published by Elsevier B.V
Differential Sensitivity of the KM3NeT/ARCA detector to a diffuse neutrino flux and to point-like source emission: exploring the case of the Starburst Galaxies
No full textKM3NeT/ARCA is a Cherenkov neutrino telescope under construction in the
Mediterranean sea, optimised for the detection of astrophysical neutrinos with
energies above 1~TeV. In this work, using Monte Carlo simulations
including all-flavour neutrinos, the integrated and differential sensitivities
for KM3NeT/ARCA are presented considering the case of a diffuse neutrino flux
as well as extended and point-like neutrino sources. This analysis is applied
to Starburst Galaxies demonstrating that the detector has the capability of
tracing TeV neutrinos from these sources. Remarkably, after eight years, a hard
power-law spectrum from the nearby Small Magellanic Cloud can be constrained.
The sensitivity and discovery potential for NGC 1068 is also evaluated showing
that KM3NeT/ARCA will discriminate between different astrophysical components
of the measured neutrino flux after 3 years of data taking.Comment: 24 pages, 6 figures, Version 2, submitted to Astroparticle Physic
Characterisation of the Hamamatsu photomultipliers for the KM3NeT Neutrino Telescope
No full textThe Hamamatsu R12199-023-inch photomultiplier tube is the photodetector chosen for the first phase of the KM3NeT neutrino telescope. About 7000 photomultipliers have been characterised for dark count rate, timing spread and spurious pulses. The quantum efficiency, the gain and the peak-to-valley ratio have also been measured for a sub-sample in order to determine parameter values needed as input to numerical simulations of the detector
Design and Development of an acoustic positioning system for a cubic kilometre underwater neutrino telescope
No full textEn los últimos años los telescopios submarinos de neutrinos han cobrado una mayor importancia ya que consisten en un nuevo y único instrumento para observar el Universo. Los neutrinos son partículas sin carga e interactúan muy débilmente con la materia que les rodean, pueden escaparse fácilmente de la fuente que los ha producidos y llegar a La Tierra sin ser desviada por los campo magnético y sin interactuar con otras partículas. Esto implica que los neutrinos pueden traer informaciones astrofísicas que otros mensajeros no pueden aportar y abrir una potencial ventana hacia el Universo. Por otro lado, su baja interacción con la materia impone la necesidad de construir un detector de grandes dimensiones del orden de 1 km3 utilizando volumen de agua o hielo y con muchos sensores ópticos para detectar esta interacción de neutrino de alta energía. Un método para detectar neutrinos es a través de la luz Cherenkov emitida por el muon generado después de una interacción de neutrino. Esta partícula, al atravesar el detector con una velocidad superior a la luz en el medio, genera una débil luz azulada llamada radiación de Cherenkov que es detectada por una red de sensores ópticos (fotomultiplicadores). El tiempo de llegada de la luz a los fotomultiplicadores puede ser utilizado para reconstruir la traza del muon y consecuentemente del neutrino que lo ha producido. La precisión en la reconstrucción de la traza del muon depende de la precisión en la medida del tiempo de llegada de la luz y en la precisión en de la posición de los sensores ópticos en el detector. Por esta razón, en telescopios submarinos es necesario un sistema de posicionamiento acústico (APS) capaz de monitorizar el movimiento de los sensores ópticos con una precisión de ~10 cm. Los estudios realizados están enmarcados dentro de las actividades de calibración de posicionamiento acústico en dos colaboraciones europeas para el diseño, construcción y operación de telescopios submarinos de neutrinos en el MediterLarosa ., G. (2012). Design and Development of an acoustic positioning system for a cubic kilometre underwater neutrino telescope [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/16877Palanci
Measurement of the atmospheric ν μ flux with six detection units of KM3NeT/ORCA
No full textAbstract A measurement of the atmospheric ν μ + ν ¯ μ flux with energies between 1 and 100 GeV is presented. The measurement has been performed using data taken with the first six detection units of the KM3NeT/ORCA detector, referred to as ORCA6. The data were collected between January 2020 and November 2021 and correspond to 510 days of livetime, with a total exposure of 433 kton · years. Using machine learning classification, 3894 neutrino candidate events have been selected with an atmospheric muon contamination of less than 1 % . The atmospheric ν μ + ν ¯ μ energy spectrum is derived using an unfolding procedure and the impact of systematic uncertainties is estimated. The atmospheric ν μ + ν ¯ μ flux measured using the ORCA6 configuration is in agreement with the values measured by other experiments
Embedded software of the KM3NeT central logic board
No full texthttps://www.sciencedirect.com/science/article/pii/S0010465523003818?via%3DihubThe KM3NeT Collaboration is building and operating two deep sea neutrino telescopes at the bottom of the
Mediterranean Sea. The telescopes consist of latices of photomultiplier tubes housed in pressure-resistant glass
spheres, called digital optical modules and arranged in vertical detection units. The two main scientific goals
are the determination of the neutrino mass ordering and the discovery and observation of high-energy neutrino
sources in the Universe. Neutrinos are detected via the Cherenkov light, which is induced by charged particles
originated in neutrino interactions. The photomultiplier tubes convert the Cherenkov light into electrical signals
that are acquired and timestamped by the acquisition electronics. Each optical module houses the acquisition
electronics for collecting and timestamping the photomultiplier signals with one nanosecond accuracy. Once
finished, the two telescopes will have installed more than six thousand optical acquisition nodes, completing
one of the more complex networks in the world in terms of operation and synchronization. The embedded
software running in the acquisition nodes has been designed to provide a framework that will operate with
different hardware versions and functionalities. The hardware will not be accessible once in operation, which
complicates the embedded software architecture. The embedded software provides a set of tools to facilitate
remote manageability of the deployed hardware, including safe reconfiguration of the firmware. This paper
presents the architecture and the techniques, methods and implementation of the embedded software running in
the acquisition nodes of the KM3NeT neutrino telescopes
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