The KM3NeT infrastructure comprises two detectors currently under construction in the Mediterranean Sea: KM3NeT/ARCA, designed for the study of high-energy cosmic neutrinos, and KM3NeT/ORCA, optimized for neutrino oscillation studies. The two detectors are already actively taking data and already providing competitive results. Indeed, the highest-energy neutrino ever observed was detected on...
Identifying the astrophysical sources of high-energy neutrinos is essential to understanding the most energetic phenomena in the Universe. While the existence of cosmic neutrinos has been established by the IceCube Neutrino Observatory, their origins remain largely unknown. The KM3NeT/ARCA detector, currently under construction in the Mediterranean Sea, is designed to address this question....
We present updated predictions for the very high energy neutrino (and gamma-ray) flux from the Galactic Plane. Our calculations includes the diffuse emission produced by interactions of CR with the interstellar gas and the cumulative flux produced by sources that are too faint to be resolved (either by neutrino or gamma-ray telescopes). The diffuse flux calculation includes the possibility of...
IceCube has continuously performed all-sky searches for point-like neutrino sources using track-like events. In this talk, we discuss the public data release of neutrino candidates detected by IceCube between April 6, 2008 and May 23, 2022. An updated selection and reconstruction for data taken after June 2010 was implemented. These updates were not implemented in the previous point-source...
The Pierre Auger Observatory, equipped with a vast Surface Detector (SD) array, is well suited to search for ultra-high-energy (UHE) neutrinos above $10^{17}$ eV through the identification of deeply penetrating air showers. The Observatory has set some of the most stringent limits on both diffuse and point-like sources of UHE neutrinos and actively contributes to multi-messenger follow-up...
The discovery of point sources of astrophysical neutrinos is a primary aim of neutrino astrophysics. To date, discovering such point sources has proven difficult because of the large atmospheric background neutrino telescopes must contend with. Because of this, only a handful of neutrino sources have been identified over the past 15 years. The development of high-purity detection techniques...
The Trinity Neutrino Observatory aims to cover an energy range from 1 PeV to 1 EeV using imaging atmospheric Cherenkov telescopes (IACTs) located at various sites to detect Earth-skimming neutrinos. The development of Tinity is organized into three phases.
The first phase, which involved the successful operation of the Trinity Demonstrator— a small Cherenkov telescope deployed on Frisco Peak...
Elena Gasparri (1), Rosa Poggiani (1), Carlotta Pittori (2,3), Fabrizio Lucarelli (2,3), Paolo Giommi (4)
(1) Department of Physics “E. Fermi”, University of Pisa, Italy
(2) INAF/OAR, Monte Porzio Catone (RM), Italy.
(3) SSDC/ASI, Roma, Italy
(4) Associated to Italian Space Agency, ASI, Roma, Italy
The search for gamma ray counterparts of IceCube neutrino events is a key item for...
Reconstructing the incoming direction of muons is a fundamental task in neutrino astronomy. In water- and ice-Cherenkov telescopes, accurate muon reconstruction is important to the entire span of an analysis, from background rejection to accurately determining the position of neutrino point sources. It is therefore crucial to both optimize and understand the performance of muon track...
The LEGEND Collaboration advances an experimental program to search for the neutrinoless double-beta decay of $^{76}$Ge.
It has recently released the first results on the decay search based on 61 kg yr of data collected by the first stage of the experiment, LEGEND-200. It operates high-purity germanium (HPGe) detectors enriched in $^{76}$Ge immersed in a cryostat filled with pure liquid...
Hybrid stars, also know as Thorne-Zytkow Objects (TZOs), have been predicted to form when a neutron star is engulfed by by another star, likely a red giant or super-giant. Then, accretion onto a neutron star can lead to a significant emission of neutrinos of all flavours with energies of 1–100 MeV. Since the neutrino signal is expected to largely vary in time (from milliseconds to thousands of...
The Pierre Auger Observatory has excellent sensitivity to ultra-high-energy (UHE) neutrinos. The Surface Detector array is used to search for highly inclined neutrino-induced air showers, which, though not observed yet, have clear characteristic signatures. Due to the null observation of UHE neutrinos, we obtain upper luminosity limits on individual gamma-ray bursts from the public catalog...
In this contribution we obtained the neutrino expectations of KM3NeT/ARCA for the Central Molecular Zone (CMZ) and the Cygnus Cocoon. The CMZ extends for a few hundred parsecs around the Galactic center, containing the massive molecular clouds Sgr A, Sgr B, and Sgr C which can act as targets for the high energy cosmic rays. The Cygnus Cocoon is a massive star-forming region of a few hundred...
Dark Matter (DM) accounts for a substantial fraction of the universe’s mass-energy content, yet its particle nature remains one of the most profound open questions in physics. Neutrinos, with their extremely weak interactions and cosmic reach, offer a unique probe of new physics scenarios involving DM. One intriguing possibility arises in the vicinity of supermassive black holes, where...
Neutrino astronomy benefits from multimessenger collaboration, particularly in the search for time-variable astrophysical sources. Identifying statistically significant astrophysical neutrino flares amid a sea of atmospheric muon and neutrino background remains challenging. In the case of a true neutrino flare, coincident detections of electromagnetic activity can strengthen the case for an...
