Articles de revistahttp://hdl.handle.net/2117/38452024-03-29T01:08:25Z2024-03-29T01:08:25ZThe KM3NeT potential for the next core-collapse supernova observation with neutrinosAiello, SebastianoAlbert, ArthurAlves Garre, SergioAly, ZinebAmbrosone, AntonioAmeli, FabrizioAndré, MichelAndroulakis, GiorgosAnghinolfi, MarcoAnguita, M.Anton, GiselaArdid Ramírez, MiguelArdid Ramírez, Joan SalvadorAublin, J.Bagatelas, ChristosBendahman, MeriemBenfenati, FabioBertin, VincentBissinger, MatthiasBou-Cabo, M.Boumaaza, JihadBouwhuis, M.C.Puricelli, StefanoCherubini, SilvioFermani, P.Huang, FengMarkou, ChristosMartini, AntonioMarzaioli, FabioMiele, GennaroMigliozzi, PasqualeMorganti, MichelePellegrino, CarloPestel, ValentinPiatelli, P.Pisanti, OfeliaRomanov, ArturSantangelo, AndreaStavropoulos, DimitrisTingay, S. J.Tzamariudaki, Ekaterinihttp://hdl.handle.net/2117/4033182024-03-03T15:44:07Z2024-02-27T14:59:58ZThe KM3NeT potential for the next core-collapse supernova observation with neutrinos
Aiello, Sebastiano; Albert, Arthur; Alves Garre, Sergio; Aly, Zineb; Ambrosone, Antonio; Ameli, Fabrizio; André, Michel; Androulakis, Giorgos; Anghinolfi, Marco; Anguita, M.; Anton, Gisela; Ardid Ramírez, Miguel; Ardid Ramírez, Joan Salvador; Aublin, J.; Bagatelas, Christos; Bendahman, Meriem; Benfenati, Fabio; Bertin, Vincent; Bissinger, Matthias; Bou-Cabo, M.; Boumaaza, Jihad; Bouwhuis, M.C.; Puricelli, Stefano; Cherubini, Silvio; Fermani, P.; Huang, Feng; Markou, Christos; Martini, Antonio; Marzaioli, Fabio; Miele, Gennaro; Migliozzi, Pasquale; Morganti, Michele; Pellegrino, Carlo; Pestel, Valentin; Piatelli, P.; Pisanti, Ofelia; Romanov, Artur; Santangelo, Andrea; Stavropoulos, Dimitris; Tingay, S. J.; Tzamariudaki, Ekaterini
The KM3NeT research infrastructure is under construction in the Mediterranean Sea. It consists of two water Cherenkov neutrino detectors, ARCA and ORCA, aimed at neutrino astrophysics and oscillation research, respectively. Instrumenting a large volume of sea water with ~ 6200 optical modules comprising a total of ~ 200,000 photomultiplier tubes, KM3NeT will achieve sensitivity to ~ 10 MeV neutrinos from Galactic and near-Galactic corecollapse supernovae through the observation of coincident hits in photomultipliers above the background. In this paper, the sensitivity of KM3NeT to a supernova explosion is estimated from detailed analyses of background data from the first KM3NeT detection units and simulations of the neutrino signal. The KM3NeT observational horizon (for a 5 s discovery) covers essentially the Milky-Way and for the most optimistic model, extends to the Small Magellanic Cloud (~ 60 kpc). Detailed studies of the time profile of the neutrino signal allow assessment of the KM3NeT capability to determine the arrival time of the neutrino burstwith a fewmilliseconds precision for sources up to 5–8 kpc away, and detecting the peculiar signature of the standing accretion shock instability if the core-collapse supernova explosion happens closer than 3–5 kpc, depending on the progenitor mass. KM3NeT’s capability to measure the neutrino flux spectral parameters is also presented.
2024-02-27T14:59:58ZAiello, SebastianoAlbert, ArthurAlves Garre, SergioAly, ZinebAmbrosone, AntonioAmeli, FabrizioAndré, MichelAndroulakis, GiorgosAnghinolfi, MarcoAnguita, M.Anton, GiselaArdid Ramírez, MiguelArdid Ramírez, Joan SalvadorAublin, J.Bagatelas, ChristosBendahman, MeriemBenfenati, FabioBertin, VincentBissinger, MatthiasBou-Cabo, M.Boumaaza, JihadBouwhuis, M.C.Puricelli, StefanoCherubini, SilvioFermani, P.Huang, FengMarkou, ChristosMartini, AntonioMarzaioli, FabioMiele, GennaroMigliozzi, PasqualeMorganti, MichelePellegrino, CarloPestel, ValentinPiatelli, P.Pisanti, OfeliaRomanov, ArturSantangelo, AndreaStavropoulos, DimitrisTingay, S. J.Tzamariudaki, EkateriniThe KM3NeT research infrastructure is under construction in the Mediterranean Sea. It consists of two water Cherenkov neutrino detectors, ARCA and ORCA, aimed at neutrino astrophysics and oscillation research, respectively. Instrumenting a large volume of sea water with ~ 6200 optical modules comprising a total of ~ 200,000 photomultiplier tubes, KM3NeT will achieve sensitivity to ~ 10 MeV neutrinos from Galactic and near-Galactic corecollapse supernovae through the observation of coincident hits in photomultipliers above the background. In this paper, the sensitivity of KM3NeT to a supernova explosion is estimated from detailed analyses of background data from the first KM3NeT detection units and simulations of the neutrino signal. The KM3NeT observational horizon (for a 5 s discovery) covers essentially the Milky-Way and for the most optimistic model, extends to the Small Magellanic Cloud (~ 60 kpc). Detailed studies of the time profile of the neutrino signal allow assessment of the KM3NeT capability to determine the arrival time of the neutrino burstwith a fewmilliseconds precision for sources up to 5–8 kpc away, and detecting the peculiar signature of the standing accretion shock instability if the core-collapse supernova explosion happens closer than 3–5 kpc, depending on the progenitor mass. KM3NeT’s capability to measure the neutrino flux spectral parameters is also presented.Combined sensitivity of JUNO and KM3NeT/ORCA to the neutrino mass orderingAiello, SebastianoAlbert, ArthurAlshamsi, MohammedAlves Garre, SergioAly, ZinebAmbrosone, AntonioAmeli, FabrizioAndré, MichelAndroulakis, GiorgosAnghinolfi, MarcoAnguita, M.Ardid Ramírez, MiguelArdid Ramírez, Joan SalvadorAublin, J.Bagatelas, Christoshttp://hdl.handle.net/2117/4033132024-03-03T15:46:50Z2024-02-27T13:42:06ZCombined sensitivity of JUNO and KM3NeT/ORCA to the neutrino mass ordering
Aiello, Sebastiano; Albert, Arthur; Alshamsi, Mohammed; Alves Garre, Sergio; Aly, Zineb; Ambrosone, Antonio; Ameli, Fabrizio; André, Michel; Androulakis, Giorgos; Anghinolfi, Marco; Anguita, M.; Ardid Ramírez, Miguel; Ardid Ramírez, Joan Salvador; Aublin, J.; Bagatelas, Christos
This 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 ¿ 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 5s 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.
2024-02-27T13:42:06ZAiello, SebastianoAlbert, ArthurAlshamsi, MohammedAlves Garre, SergioAly, ZinebAmbrosone, AntonioAmeli, FabrizioAndré, MichelAndroulakis, GiorgosAnghinolfi, MarcoAnguita, M.Ardid Ramírez, MiguelArdid Ramírez, Joan SalvadorAublin, J.Bagatelas, ChristosThis 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 ¿ 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 5s 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.Neuroanatomy of the cetacean sensory systemsVreese, Steffen deOrekhova, KseniaMorell, MariaGerussi, TommasoGraïc, Jean-Mariehttp://hdl.handle.net/2117/4005212024-02-04T23:05:48Z2024-01-30T11:59:29ZNeuroanatomy of the cetacean sensory systems
Vreese, Steffen de; Orekhova, Ksenia; Morell, Maria; Gerussi, Tommaso; Graïc, Jean-Marie
Cetaceans have undergone profound sensory adaptations in response to their aquatic environment during evolution. These adaptations are characterised by anatomo-functional changes in the classically defined sensory systems, shaping their neuroanatomy accordingly. This review offers a concise and up-to-date overview of our current understanding of the neuroanatomy associated with cetacean sensory systems. It encompasses a wide spectrum, ranging from the peripheral sensory cells responsible for detecting environmental cues, to the intricate structures within the central nervous system that process and interpret sensory information. Despite considerable progress in this field, numerous knowledge gaps persist, impeding a comprehensive and integrated understanding of their sensory adaptations, and through them, of their sensory perspective. By synthesising recent advances in neuroanatomical research, this review aims to shed light on the intricate sensory alterations that differentiate cetaceans from other mammals and allow them to thrive in the marine environment. Furthermore, it highlights pertinent knowledge gaps and invites future investigations to deepen our understanding of the complex processes in cetacean sensory ecology and anatomy, physiology and pathology in the scope of conservation biology.
2024-01-30T11:59:29ZVreese, Steffen deOrekhova, KseniaMorell, MariaGerussi, TommasoGraïc, Jean-MarieCetaceans have undergone profound sensory adaptations in response to their aquatic environment during evolution. These adaptations are characterised by anatomo-functional changes in the classically defined sensory systems, shaping their neuroanatomy accordingly. This review offers a concise and up-to-date overview of our current understanding of the neuroanatomy associated with cetacean sensory systems. It encompasses a wide spectrum, ranging from the peripheral sensory cells responsible for detecting environmental cues, to the intricate structures within the central nervous system that process and interpret sensory information. Despite considerable progress in this field, numerous knowledge gaps persist, impeding a comprehensive and integrated understanding of their sensory adaptations, and through them, of their sensory perspective. By synthesising recent advances in neuroanatomical research, this review aims to shed light on the intricate sensory alterations that differentiate cetaceans from other mammals and allow them to thrive in the marine environment. Furthermore, it highlights pertinent knowledge gaps and invites future investigations to deepen our understanding of the complex processes in cetacean sensory ecology and anatomy, physiology and pathology in the scope of conservation biology.Embedded software of the KM3NeT central logic boardAiello, SebastianoAlbert, ArnauldAlves Garre, SergioAly, ZinebAmbrosone, AntonioAmeli, FabrizioAndré, MichelAndroutsou, E.Anghinolfi, MarcoAnguita, M.Aphecetche, LaurentArdid Ramírez, MiguelArdid Ramírez, Joan SalvadorAtmani, Hhttp://hdl.handle.net/2117/3990452024-01-17T13:30:18Z2024-01-10T11:51:02ZEmbedded software of the KM3NeT central logic board
Aiello, Sebastiano; Albert, Arnauld; Alves Garre, Sergio; Aly, Zineb; Ambrosone, Antonio; Ameli, Fabrizio; André, Michel; Androutsou, E.; Anghinolfi, Marco; Anguita, M.; Aphecetche, Laurent; Ardid Ramírez, Miguel; Ardid Ramírez, Joan Salvador; Atmani, H
The 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.
2024-01-10T11:51:02ZAiello, SebastianoAlbert, ArnauldAlves Garre, SergioAly, ZinebAmbrosone, AntonioAmeli, FabrizioAndré, MichelAndroutsou, E.Anghinolfi, MarcoAnguita, M.Aphecetche, LaurentArdid Ramírez, MiguelArdid Ramírez, Joan SalvadorAtmani, HThe 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.Towards automated long-term acoustic monitoring of endangered river dolphins: a case study in the Brazilian Amazon floodplainsErbs, Florence AmandineGaona, MarinaVan der Schaar, Mike Connor Roger MalcolmZaugg, Serge AlainRamalho, EmilianoHouser, DorianAndré, Michelhttp://hdl.handle.net/2117/3935382023-09-17T22:44:54Z2023-09-15T08:54:05ZTowards automated long-term acoustic monitoring of endangered river dolphins: a case study in the Brazilian Amazon floodplains
Erbs, Florence Amandine; Gaona, Marina; Van der Schaar, Mike Connor Roger Malcolm; Zaugg, Serge Alain; Ramalho, Emiliano; Houser, Dorian; André, Michel
Using passive acoustic monitoring (PAM) and convolutional neural networks (CNN), we monitored the movements of the two endangered Amazon River dolphin species, the boto (Inia geoffrensis) and the tucuxi (Sotalia fluviatilis) from main rivers to floodplain habitats (várzea) in the Mamirauá Reserve (Amazonas, Brazil). We detected dolphin presence in four main areas based on the classification of their echolocation clicks. Using the same method, we automatically detected boat passages to estimate a possible interaction between boat and dolphin presence. Performance of the CNN classifier was high with an average precision of 0.95 and 0.92 for echolocation clicks and boats, respectively. Peaks of acoustic activity were detected synchronously at the river entrance and channel, corresponding to dolphins seasonally entering the várzea. Additionally, the river dolphins were regularly detected inside the flooded forest, suggesting a wide dispersion of their populations inside this large area, traditionally understudied and particularly important for boto females and calves. Boats overlapped with dolphin presence 9% of the time. PAM and recent advances in classification methods bring a new insight of the river dolphins’ use of várzea habitats, which will contribute to conservation strategies of these species.
2023-09-15T08:54:05ZErbs, Florence AmandineGaona, MarinaVan der Schaar, Mike Connor Roger MalcolmZaugg, Serge AlainRamalho, EmilianoHouser, DorianAndré, MichelUsing passive acoustic monitoring (PAM) and convolutional neural networks (CNN), we monitored the movements of the two endangered Amazon River dolphin species, the boto (Inia geoffrensis) and the tucuxi (Sotalia fluviatilis) from main rivers to floodplain habitats (várzea) in the Mamirauá Reserve (Amazonas, Brazil). We detected dolphin presence in four main areas based on the classification of their echolocation clicks. Using the same method, we automatically detected boat passages to estimate a possible interaction between boat and dolphin presence. Performance of the CNN classifier was high with an average precision of 0.95 and 0.92 for echolocation clicks and boats, respectively. Peaks of acoustic activity were detected synchronously at the river entrance and channel, corresponding to dolphins seasonally entering the várzea. Additionally, the river dolphins were regularly detected inside the flooded forest, suggesting a wide dispersion of their populations inside this large area, traditionally understudied and particularly important for boto females and calves. Boats overlapped with dolphin presence 9% of the time. PAM and recent advances in classification methods bring a new insight of the river dolphins’ use of várzea habitats, which will contribute to conservation strategies of these species.Artificial sound impact could put at risk hermit crabs and their symbiont anemonesSolé Carbonell, MartaVreese, Steffen deFortuño Alós, Jose-ManuelVan der Schaar, Mike Connor Roger Malcolmhttp://hdl.handle.net/2117/3925632023-07-31T08:10:19Z2023-07-31T08:06:06ZArtificial sound impact could put at risk hermit crabs and their symbiont anemones
Solé Carbonell, Marta; Vreese, Steffen de; Fortuño Alós, Jose-Manuel; Van der Schaar, Mike Connor Roger Malcolm
The sea anemone Calliactis parasitica, which is found in the East Atlantic (Portugal to Senegal) and the Mediterranean Sea, forms a symbiotic relationship with the red hermit crab, Dardanus calidus, in which the anemone provides protection from predators such as the octopus while it gains mobility, and possibly food scraps, from the hermit crab. Acoustic pollution is recognised by the scientific community as a growing threat to ocean inhabitants. Recent findings on marine invertebrates showed that exposure to artificial sound had direct behavioural, physiological and ultrastructural consequences. In this study we assess the impact of artificial sound (received level 157 ± 5 dB re 1 µPa2 with peak levels up to 175 dB re 1 µPa2) on the red hermit crab and its symbiotic sea anemone. Scanning electron microscopy analyses revealed lesions in the statocyst of the red hermit crab and in the tentacle sensory epithelia of its anemone when exposed to low-intensity, low-frequency sounds. These ultrastructural changes under situations of acoustic stress in symbiotic partners belonging to different phyla is a new issue that may limit their survival capacity, and a new challenge in assessing the effects of acoustic disturbance in the oceanic ecosystem. Despite the lesions found in the red hermit crab, its righting reflex time was not as strongly affected showing only an increase in the range of righting times. Given that low-frequency sound levels in the ocean are increasing and that reliable bioacoustic data on invertebrates is very scarce, in light of the results of the present study, we argue that anthropogenic sound effects on invertebrates species may have direct consequences in the entire ecosystem.
2023-07-31T08:06:06ZSolé Carbonell, MartaVreese, Steffen deFortuño Alós, Jose-ManuelVan der Schaar, Mike Connor Roger MalcolmThe sea anemone Calliactis parasitica, which is found in the East Atlantic (Portugal to Senegal) and the Mediterranean Sea, forms a symbiotic relationship with the red hermit crab, Dardanus calidus, in which the anemone provides protection from predators such as the octopus while it gains mobility, and possibly food scraps, from the hermit crab. Acoustic pollution is recognised by the scientific community as a growing threat to ocean inhabitants. Recent findings on marine invertebrates showed that exposure to artificial sound had direct behavioural, physiological and ultrastructural consequences. In this study we assess the impact of artificial sound (received level 157 ± 5 dB re 1 µPa2 with peak levels up to 175 dB re 1 µPa2) on the red hermit crab and its symbiotic sea anemone. Scanning electron microscopy analyses revealed lesions in the statocyst of the red hermit crab and in the tentacle sensory epithelia of its anemone when exposed to low-intensity, low-frequency sounds. These ultrastructural changes under situations of acoustic stress in symbiotic partners belonging to different phyla is a new issue that may limit their survival capacity, and a new challenge in assessing the effects of acoustic disturbance in the oceanic ecosystem. Despite the lesions found in the red hermit crab, its righting reflex time was not as strongly affected showing only an increase in the range of righting times. Given that low-frequency sound levels in the ocean are increasing and that reliable bioacoustic data on invertebrates is very scarce, in light of the results of the present study, we argue that anthropogenic sound effects on invertebrates species may have direct consequences in the entire ecosystem.Hint for a TeV neutrino emission from the Galactic Ridge with ANTARESAlbert, ArthurAlves Garre, SergioAndré, MichelArdid Ramírez, MiguelArdid Ramírez, Joan SalvadorAubert, J.-J.Aublin, J.Baret, BrunyBasa, S.Becherini, Y.Belhorma, BouchraBendahman, MeriemBenfenati, FabioBertin, Vincenthttp://hdl.handle.net/2117/3880812023-06-04T19:57:22Z2023-05-30T07:48:35ZHint for a TeV neutrino emission from the Galactic Ridge with ANTARES
Albert, Arthur; Alves Garre, Sergio; André, Michel; Ardid Ramírez, Miguel; Ardid Ramírez, Joan Salvador; Aubert, J.-J.; Aublin, J.; Baret, Bruny; Basa, S.; Becherini, Y.; Belhorma, Bouchra; Bendahman, Meriem; Benfenati, Fabio; Bertin, Vincent
Interactions of cosmic ray protons, atomic nuclei, and electrons in the interstellar medium in the inner part of the Milky Way produce a ¿-ray flux from the Galactic Ridge. If the ¿-ray emission is dominated by proton and nuclei interactions, a neutrino flux comparable to the ¿-ray flux is expected from the same sky region. Data collected by the ANTARES neutrino telescope are used to constrain the neutrino flux from the Galactic Ridge in the 1-100 TeV energy range. Neutrino events reconstructed both as tracks and showers are considered in the analysis and the selection is optimized for the search of an excess in the region |l| <30¿, |b| <2¿. The expected background in the search region is estimated using an off-zone region with similar sky coverage. Neutrino signal originating from a power-law spectrum with spectral index ranging from ¿=1to 4is simulated in both channels. The observed energy distributions are fitted to constrain the neutrino emission from the Ridge. The energy distributions in the signal region are inconsistent with the background expectation at ~96% confidence level. The mild excess over the background is consistent with a neutrino flux with a power law with a spectral index 2.45+0.22 -0.34and a flux normalization dN¿ dE¿ =4.0+2.7 -2.0 ×10-16GeV-1cm-2s-1sr-1 at 40 TeV reference energy. Such flux is consistent with the expected neutrino signal if the bulk of the observed ¿-ray flux from the Galactic Ridge originates from interactions of cosmic ray protons and nuclei with a power-law spectrum extending well into the PeV energy range.
2023-05-30T07:48:35ZAlbert, ArthurAlves Garre, SergioAndré, MichelArdid Ramírez, MiguelArdid Ramírez, Joan SalvadorAubert, J.-J.Aublin, J.Baret, BrunyBasa, S.Becherini, Y.Belhorma, BouchraBendahman, MeriemBenfenati, FabioBertin, VincentInteractions of cosmic ray protons, atomic nuclei, and electrons in the interstellar medium in the inner part of the Milky Way produce a ¿-ray flux from the Galactic Ridge. If the ¿-ray emission is dominated by proton and nuclei interactions, a neutrino flux comparable to the ¿-ray flux is expected from the same sky region. Data collected by the ANTARES neutrino telescope are used to constrain the neutrino flux from the Galactic Ridge in the 1-100 TeV energy range. Neutrino events reconstructed both as tracks and showers are considered in the analysis and the selection is optimized for the search of an excess in the region |l| <30¿, |b| <2¿. The expected background in the search region is estimated using an off-zone region with similar sky coverage. Neutrino signal originating from a power-law spectrum with spectral index ranging from ¿=1to 4is simulated in both channels. The observed energy distributions are fitted to constrain the neutrino emission from the Ridge. The energy distributions in the signal region are inconsistent with the background expectation at ~96% confidence level. The mild excess over the background is consistent with a neutrino flux with a power law with a spectral index 2.45+0.22 -0.34and a flux normalization dN¿ dE¿ =4.0+2.7 -2.0 ×10-16GeV-1cm-2s-1sr-1 at 40 TeV reference energy. Such flux is consistent with the expected neutrino signal if the bulk of the observed ¿-ray flux from the Galactic Ridge originates from interactions of cosmic ray protons and nuclei with a power-law spectrum extending well into the PeV energy range.First observation of the cosmic ray shadow of the moon and the sun with KM3NeT/ORCAAiello, SAlbert, ArthurAlves Garre, SergioAly, ZinebAmbrosone, AntonioAmeli, FAndré, MichelAnghinolfi, MarcoAnguita, M.Ardid Ramírez, MiguelArdid Ramírez, Joan SalvadorAublin, J.Bagatelas, Christoshttp://hdl.handle.net/2117/3876712023-05-28T10:45:40Z2023-05-22T09:19:08ZFirst observation of the cosmic ray shadow of the moon and the sun with KM3NeT/ORCA
Aiello, S; Albert, Arthur; Alves Garre, Sergio; Aly, Zineb; Ambrosone, Antonio; Ameli, F; André, Michel; Anghinolfi, Marco; Anguita, M.; Ardid Ramírez, Miguel; Ardid Ramírez, Joan Salvador; Aublin, J.; Bagatelas, Christos
This article reports the first observation of the Moon and the Sun shadows in the sky distribution of cosmicray induced muons measured by the KM3NeT/ORCA detector. The analysed data-taking period spans from February 2020 to November 2021, when the detector had 6 Detection Units deployed at the bottom of the Mediterranean Sea, each composed of 18 Digital Optical Modules. The shadows induced by the Moon and the Sun were detected at their nominal position with a statistical significance of 4.2s and 6.2s, and an angular resolution of sres = 0.49¿ and sres = 0.66¿, respectively, consistent with the prediction of 0.53¿ from simulations. This early result confirms the effectiveness of the detector calibration, in time, position and orientation and the accuracy of the event direction reconstruction. This also demonstrates the performance and the competitiveness of the detector in terms of pointing accuracy and angular resolution
2023-05-22T09:19:08ZAiello, SAlbert, ArthurAlves Garre, SergioAly, ZinebAmbrosone, AntonioAmeli, FAndré, MichelAnghinolfi, MarcoAnguita, M.Ardid Ramírez, MiguelArdid Ramírez, Joan SalvadorAublin, J.Bagatelas, ChristosThis article reports the first observation of the Moon and the Sun shadows in the sky distribution of cosmicray induced muons measured by the KM3NeT/ORCA detector. The analysed data-taking period spans from February 2020 to November 2021, when the detector had 6 Detection Units deployed at the bottom of the Mediterranean Sea, each composed of 18 Digital Optical Modules. The shadows induced by the Moon and the Sun were detected at their nominal position with a statistical significance of 4.2s and 6.2s, and an angular resolution of sres = 0.49¿ and sres = 0.66¿, respectively, consistent with the prediction of 0.53¿ from simulations. This early result confirms the effectiveness of the detector calibration, in time, position and orientation and the accuracy of the event direction reconstruction. This also demonstrates the performance and the competitiveness of the detector in terms of pointing accuracy and angular resolutionProbing invisible neutrino decay with KM3NeT/ORCAAiello, SAlbert, ArthurAlves Garre, SergioAly, ZinebAmbrosone, AntonioAmeli, FAndré, MichelAnghinolfi, MarcoAnguita, M.Ardid Ramírez, MiguelArdid Ramírez, Joan SalvadorAublin, J.Bagatelas, Christoshttp://hdl.handle.net/2117/3876672023-05-28T10:47:15Z2023-05-22T08:41:02ZProbing invisible neutrino decay with KM3NeT/ORCA
Aiello, S; Albert, Arthur; Alves Garre, Sergio; Aly, Zineb; Ambrosone, Antonio; Ameli, F; André, Michel; Anghinolfi, Marco; Anguita, M.; Ardid Ramírez, Miguel; Ardid Ramírez, Joan Salvador; Aublin, J.; Bagatelas, Christos
In the era of precision measurements of the neutrino oscillation parameters, upcoming neutrino experiments will also be sensitive to physics beyond the Standard Model. KM3NeT/ORCA is a neutrino detector optimised for measuring atmospheric neutrinos from a few GeV to around 100 GeV. In this paper, the sensitivity of the KM3NeT/ORCA detector to neutrino decay has been explored. A three-flavour neutrino oscillation scenario, where the third neutrino mass state ¿3 decays into an invisible state, e.g. a sterile neutrino, is considered. We find that KM3NeT/ORCA would be sensitive to invisible neutrino decays with 1/a3 = t3/m3 < 180 ps/eV at 90% confidence level, assuming true normal ordering. Finally, the impact of neutrino decay on the precision of KM3NeT/ORCA measurements for ¿23, ¿m231 and mass ordering have been studied. No significant effect of neutrino decay on the sensitivity to these measurements has been found.
2023-05-22T08:41:02ZAiello, SAlbert, ArthurAlves Garre, SergioAly, ZinebAmbrosone, AntonioAmeli, FAndré, MichelAnghinolfi, MarcoAnguita, M.Ardid Ramírez, MiguelArdid Ramírez, Joan SalvadorAublin, J.Bagatelas, ChristosIn the era of precision measurements of the neutrino oscillation parameters, upcoming neutrino experiments will also be sensitive to physics beyond the Standard Model. KM3NeT/ORCA is a neutrino detector optimised for measuring atmospheric neutrinos from a few GeV to around 100 GeV. In this paper, the sensitivity of the KM3NeT/ORCA detector to neutrino decay has been explored. A three-flavour neutrino oscillation scenario, where the third neutrino mass state ¿3 decays into an invisible state, e.g. a sterile neutrino, is considered. We find that KM3NeT/ORCA would be sensitive to invisible neutrino decays with 1/a3 = t3/m3 < 180 ps/eV at 90% confidence level, assuming true normal ordering. Finally, the impact of neutrino decay on the precision of KM3NeT/ORCA measurements for ¿23, ¿m231 and mass ordering have been studied. No significant effect of neutrino decay on the sensitivity to these measurements has been found.Search for neutrino counterparts to the gravitational wave sources from LIGO/Virgo O3 run with the ANTARES detectorAlbert, ArthurAlves Garre, SergioAndré, MichelArdid Ramírez, MiguelArdid Ramírez, Joan SalvadorAubert, J.-J.Aublin, J.Baret, BrunyBasa, S.Becherini, Y.Belhorma, BouchraBendahman, MeriemBenfenati, FabioBertin, VincentBiagi, S.http://hdl.handle.net/2117/3871592023-05-14T18:53:34Z2023-05-08T10:10:40ZSearch for neutrino counterparts to the gravitational wave sources from LIGO/Virgo O3 run with the ANTARES detector
Albert, Arthur; Alves Garre, Sergio; André, Michel; Ardid Ramírez, Miguel; Ardid Ramírez, Joan Salvador; Aubert, J.-J.; Aublin, J.; Baret, Bruny; Basa, S.; Becherini, Y.; Belhorma, Bouchra; Bendahman, Meriem; Benfenati, Fabio; Bertin, Vincent; Biagi, S.
Since 2015 the LIGO and Virgo interferometers have detected gravitational waves from almost one hundred coalescences of compact objects (black holes and neutron stars). This article presents the results of a search performed with data from the ANTARES telescope to identify neutrino counterparts to the gravitational wave sources detected during the third LIGO/Virgo observing run and reported in the catalogues GWTC-2, GWTC-2.1, and GWTC-3. This search is sensitive to all-sky neutrinos of all flavours and of energies > 100 GeV, thanks to the inclusion of both track-like events (mainly induced by ¿µ chargedcurrent interactions) and shower-like events (induced by other interaction types). Neutrinos are selected if they are detected within ±500 s from the GW merger and with a reconstructed direction compatible with its sky localisation. No significant excess is found for any of the 80 analysed GW events, and upper limits on the neutrino emission are derived. Using the information from the GW catalogues and assuming isotropic emission, upper limits on the total energy Etot,¿ emitted as neutrinos of all flavours and on the ratio f¿ = Etot,¿/EGW between neutrino and GW emissions are also computed. Finally, a stacked analysis of all the 72 binary black hole mergers (respectively the 7 neutron star-black hole merger candidates) has been performed to constrain the typical neutrino emission within this population, leading to the limits: Etot,¿ < 4.0 × 1053 erg and f¿ < 0.15 (respectively, Etot,¿ < 3.2 × 1053 erg and f¿ < 0.88) for E-2 spectrum and isotropic emission. Other assumptions including softer spectra and non-isotropic scenarios have also been tested
2023-05-08T10:10:40ZAlbert, ArthurAlves Garre, SergioAndré, MichelArdid Ramírez, MiguelArdid Ramírez, Joan SalvadorAubert, J.-J.Aublin, J.Baret, BrunyBasa, S.Becherini, Y.Belhorma, BouchraBendahman, MeriemBenfenati, FabioBertin, VincentBiagi, S.Since 2015 the LIGO and Virgo interferometers have detected gravitational waves from almost one hundred coalescences of compact objects (black holes and neutron stars). This article presents the results of a search performed with data from the ANTARES telescope to identify neutrino counterparts to the gravitational wave sources detected during the third LIGO/Virgo observing run and reported in the catalogues GWTC-2, GWTC-2.1, and GWTC-3. This search is sensitive to all-sky neutrinos of all flavours and of energies > 100 GeV, thanks to the inclusion of both track-like events (mainly induced by ¿µ chargedcurrent interactions) and shower-like events (induced by other interaction types). Neutrinos are selected if they are detected within ±500 s from the GW merger and with a reconstructed direction compatible with its sky localisation. No significant excess is found for any of the 80 analysed GW events, and upper limits on the neutrino emission are derived. Using the information from the GW catalogues and assuming isotropic emission, upper limits on the total energy Etot,¿ emitted as neutrinos of all flavours and on the ratio f¿ = Etot,¿/EGW between neutrino and GW emissions are also computed. Finally, a stacked analysis of all the 72 binary black hole mergers (respectively the 7 neutron star-black hole merger candidates) has been performed to constrain the typical neutrino emission within this population, leading to the limits: Etot,¿ < 4.0 × 1053 erg and f¿ < 0.15 (respectively, Etot,¿ < 3.2 × 1053 erg and f¿ < 0.88) for E-2 spectrum and isotropic emission. Other assumptions including softer spectra and non-isotropic scenarios have also been tested