S. Appel’s research while affiliated with Technical University of Munich and other places

... Concerning solar neutrinos, Borexino presented its latest results [6]. Thanks to the extreme radiopurity of the scintillator and to accurate calibration campaigns, Borexino was able to provide not only the first direct measurement of 7 Be neutrinos, but also the first direct measurements of pep and pp neutrinos. ...

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Oscillation Parameters, Present: Session Summary

... Over the past few decades, liquid scintillator based detectors have been widely employed in particle and astroparticle physics for rare event searches, aiming to detect dark matter [4] and neutrinos from natural [5] and artificial sources [6]. These experiments have been fundamental for the determination of the neutrino oscillation parameters [6,7] and solar neutrino spectroscopy [5,8,9]. ...

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Fluorescence emission of the JUNO liquid scintillator

... measurements made by Refs. [42,110,125]). Nuclear fusion processes in the Sun emit only ν e , however these neutrinos experience a strong energy-dependent matter oscillations inside the Sun as well as vacuum oscillations between the Sun and Earth. ...

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CYG$$\nu $$S: detecting solar neutrinos with directional gas time projection chambers

... This phenomenon is widely known, and a reference [12] describes it in detail. In the JSNS 2 case, the circuits of PMT bleeders [8], splitters [13], Front-End-Electronics (FEE [13,14]) and cables lengths of PMTs (RG303U, typically 22 meters) and signals (RG58C/U, typically 15 meters) affect the time constant. Note that the splitter and FEE circuits were donated from the Double-Chooz experiment to the JSNS 2 , and they are used for JSNS 2 . ...

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A muon tagging with Flash ADC waveform baselines

... Recently the Borexino collaboration [1] reported at Neutrino2020 the results of first detection of solar neutrinos from CNO cycle and published the arXiv [2]. They used of two types of analysis of experimental data: Counting Analysis and Multivariable fit. ...

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On first detection of solar neutrinos from CNO cycle with Borexino

... To implement the Bottom CRT, nine modules built for the Double Chooz outer veto detector [11] were installed below the ICARUS cryostat, as sketched in figure 10. ...

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Design and implementation of the cosmic ray tagger system for the ICARUS detector at FNAL

... In this effort, this work contains the latest analysis within the NuFIT program, NuFIT 6.0, which incorporates a number of changes and updates since our last published analysis in JHEP12(2024)216 2020 [4]. In the solar neutrino sector, the new generation of Standard Solar Models [10] are now used for the predictions, and the full day-night spectrum from the phase-IV of Super-Kamiokande [11] together with the final spectra from Borexino phases-II [12] and III [13] are included. For the long baseline (LBL) reactor data, we have updated the reactor antineutrino fluxes used for the predictions to the latest Daya-Bay measurements [14], and results from SNO+ [15][16][17] are included in the global analysis for the first time. ...

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NuFit-6.0: updated global analysis of three-flavor neutrino oscillations

... More recently, the short gamma-ray burst GRB170817A was detected in 1.7 s temporal coincidence with the GW170817 event from a binary neutron-star merger [4]: the observation of GW events triggered an intensive follow-up campaign in neutrino detectors. An underground ultrapure detector like Borexino (BX) is perfectly suited for studies of rare and exotic processes in particle physics and astrophysics: the collaboration has already studied the diffuse supernova antineutrino background below 8 MeV [6,7] and searched for possible time correlated events with transient astrophysical sources such as -ray bursts [8], gravitational wave events [9], solar flares [7], and fast radio burst [10] . ...

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The study of neutrinos and antineutrinos from astrophysical sources by Borexino

... Although neutrino directionality is an important and well-established observable at higher energies [4,9,18,81], there are currently only a very limited number of techniques able to reconstruct this information in the regime relevant for the low-energy solar neutrino fluxes [82][83][84][85]. So far, directional detection of lowenergy recoil tracks at the necessary O(10-100) keV energies has only been shown to be experimentally feasible for time-projection chambers (TPCs) using gaseous targets [86,87]. ...

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Searching for beyond-Standard-Model solar neutrino interactions using directional detectors

... Although neutrino directionality is an important and well-established observable at higher energies [4,9,18,81], there are currently only a very limited number of techniques able to reconstruct this information in the regime relevant for the low-energy solar neutrino fluxes [82][83][84][85]. So far, directional detection of lowenergy recoil tracks at the necessary O(10-100) keV energies has only been shown to be experimentally feasible for time-projection chambers (TPCs) using gaseous targets [86,87]. ...

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Searching for beyond-Standard-Model solar neutrino interactions using directional detectors