A5014038438- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Radiation Detection and Scintillator Technologies
- Particle Detector Development and Performance
- Magnetic confinement fusion research
- Radioactivity and Radon Measurements
- Radioactive Decay and Measurement Techniques
- Nuclear physics research studies
- Pulsars and Gravitational Waves Research
- Mechanical and Optical Resonators
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Gamma-ray bursts and supernovae
- Radioactive contamination and transfer
- Lanthanide and Transition Metal Complexes
- Strong Light-Matter Interactions
- Muon and positron interactions and applications
- Noncommutative and Quantum Gravity Theories
- Scientific Research and Discoveries
- Nuclear Physics and Applications
- Model Reduction and Neural Networks
- Electron Spin Resonance Studies
Queen's University
2013-2025
Université Paris Cité
2024
Centre National de la Recherche Scientifique
2024
Sorbonne Paris Cité
2024
Sorbonne Université
2024
Université Paris Sciences et Lettres
2024
University of Southampton
2019-2021
United States Agency for International Development
2019
Princeton University
2010-2016
University of California, Los Angeles
2013-2015
We observed, for the first time, solar neutrinos in 1.0-1.5 MeV energy range. measured rate of pep neutrino interactions Borexino to be [3.1+-0.6(stat)+-0.3(syst)] counts/(day x 100 ton) and provided a constraint on CNO interaction <7.9 (95% C.L.). The absence signal is disfavored at 99.97% C.L., while 98% C.L. This unprecedented sensitivity was achieved by adopting novel data analysis techniques rejection cosmogenic 11C, dominant background 1-2 region. Assuming MSW-LMA solution...
Geo-neutrinos, electron anti-neutrinos produced in beta decays of naturally occurring radioactive isotopes the Earth, are a unique direct probe our planet's interior. We report first observation at more than 3$\sigma$ C.L. geo-neutrinos, performed with Borexino detector Laboratori Nazionali del Gran Sasso. Anti-neutrinos detected through neutron inverse decay reaction. With 252.6 ton-yr fiducial exposure after all selection cuts, we 9.9^{+4.1}_{-3.4}(^{+14.6}_{-8.2}) geo-neutrino events,...
We present a measurement of the geo--neutrino signal obtained from 1353 days data with Borexino detector at Laboratori Nazionali del Gran Sasso in Italy. With fiducial exposure (3.69 $\pm$ 0.16) $\times$ $10^{31}$ proton year after all selection cuts and background subtraction, we detected (14.3 4.4) geo-neutrino events assuming fixed chondritic mass Th/U ratio 3.9. This corresponds to $S_{geo}$ = (38.8 12.0) TNU just 6 $10^{-6}$ probability for null measurement. U Th left as free parameters...
Borexino, a liquid scintillator detector at LNGS, is designed for the detection of neutrinos and antineutrinos from Sun, supernovae, nuclear reactors, Earth. The feeble nature these signals requires strong suppression backgrounds below few MeV. Very low intrinsic radiogenic contamination all components needs to be accompanied by efficient identification muons muon-induced backgrounds. Muons produce unstable nuclei spallation processes along their trajectory through whose decays can mimic...
Nonhindered aromatic α-dicarbonyl molecules show abnormal spectroscopic behavior when compared to other containing carbonyl groups. Taking benzil as a typical example, its photoabsorption and emission spectra cannot be accounted for by the normal Jablonski scheme. The spectral data are consistent with mechanism involving molecular reorientation. It is postulated that photoexcitation of causes it change from skew configuration into one in which dicarbonyl system becomes coplanar while excited...
We have measured the muon flux at underground Gran Sasso National Laboratory (3800 m w.e.) to be (3.41 \pm 0.01) \times 10-4m-2s-1 using four years of Borexino data. A modulation this signal is observed with a period (366\pm3) days and relative amplitude (1.29 0.07)%. The phase (179 6) days, corresponding maximum on 28th June. Using most complete atmospheric data models available, rate fluctuations are shown positively correlated temperature, an effective coefficient {\alpha}T = 0.93 0.04....
A search for 5.5-MeV solar axions produced in the $p+d\rightarrow\rm{^3He}+A (5.5 \rm{MeV})$ reaction was performed using Borexino detector. The Compton conversion of to photons, ${\rm A}+e\rightarrow e+\gamma$; axio-electric effect, A}+e+Z\rightarrow e+Z$; decay into two A}\rightarrow2\gamma$; and inverse Primakoff on nuclei, A}+Z\rightarrow\gamma+Z$, are considered. Model independent limits axion-electron ($g_{Ae}$), axion-photon ($g_{A\gamma}$), isovector axion-nucleon ($g_{3AN}$)...
The solar neutrino experiment Borexino, which is located in the Gran Sasso underground laboratories, a unique position to study muon-induced backgrounds an organic liquid scintillator. In this study, large sample of cosmic muons identified and tracked by muon veto detector external scintillator, specific light patterns observed when cross scintillator volume. yield neutrons found be Yn = (3.10±0.11)·10−4 n/(μ·(g/cm2)). distance profile between parent track neutron capture point has average...
Borexino was the first experiment to detect solar neutrinos in real-time sub-MeV region. In order achieve high precision determination of neutrino rates, detector design includes an internal and external calibration system. This paper describes both systems campaigns that were carried out period between 2008 2011. We discuss some results show procedures preserved radiopurity scintillator. The calibrations provided a detailed understanding response led significant reduction systematic...
The determination of the mass, composition, and geometry matter outflows in black hole-neutron star neutron star-neutron binaries is crucial to current efforts model kilonovae, understand role merger r-process nucleosynthesis. In this manuscript, we review simple criteria currently used simulations determine whether unbound what asymptotic velocity ejected material will be. We then show that properly accounting for both heating cooling during nucleosynthesis important accurately predict mass...
If heavy neutrinos with mass mνH≥2me are produced in the Sun via decay B8→Be8+e++νH a side branch of pp chain, they would undergo observable into an electron, positron and light neutrino νH→νL+e++e−. In present work Borexino data used to set bound on existence such decays. We constrain mixing 1.5 MeV≤mνH≤14 MeV be |UeH|2≤(10−3−4×10−6), respectively. These tighter limits parameters than obtained previous experiments at nuclear reactors accelerators.Received 27 May...
We have studied the α-decays of 214Po into 210Pb and 212Po 208Pb tagged by coincidence with preceding β-decays from 214Bi 212Bi, respectively. The 222Rn, 232Th, 220Rn sources used were sealed inside quartz vials inserted in Counting Test Facility at underground Gran Sasso National Laboratory Italy. find that mean lifetime is (236.00 ± 0.42(stat) 0.15(syst)) μs (425.1 0.9(stat) 1.2(syst)) ns. Our results, obtained data signal-to-background ratio larger than 1000, reduce overall uncertainties...
ABSTRACT We present an extension to the special relativistic, ideal magnetohydrodynamic (MHD) equations, designed capture effects due resistivity. The takes simple form of additional source term that, when implemented numerically, is shown emulate behaviour produced by a fully resistive MHD description for range initial data. developed from first principles arguments, and thus requires no fine-tuning parameters, meaning it can be applied wide dynamical systems. Furthermore, our does not...
Borexino, a large volume liquid scintillator detector installed at Gran Sasso laboratory, demonstrated extraordinary sensitivity with respect to neutrino and antineutrino detection, reporting the best up date results on low energy solar fluxes performing geo-neutrino detection. Energy position of 1 MeV events in Borexino are recon- structed precision 5% 14 cm respectively. These performances together extremely background provides an excellent opportunity for study short distance oscillations...
In this work we present a proof of concept CUDA-capable, resistive, multi-fluid models relativistic magnetohydrodynamics (RMHD). Resistive and codes for simulating RMHD suffer from stiff source terms, so it is common to implement set semi-implicit time integrators maintain numerical stability. We show, the first time, that finite volume IMEX schemes resistive two-fluid can be accelerated by execution on graphics processing units, significantly reducing demand these kinds problems. report...