N. Yu. Agafonova

Institute for Nuclear Research

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A. S. Malgin

Institute for Nuclear Research

O. G. Ryazhskaya

Institute for Nuclear Research

V. F. Yakushev

Institute for Nuclear Research

R. I. Enikeev

Institute for Nuclear Research

Y. Gornushkin

Joint Institute for Nuclear Research

L. Votano

Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati

A. Chukanov

Joint Institute for Nuclear Research

N. D’Ambrosio

Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Gran Sasso

A. Anokhina

European Organization for Nuclear Research

C. Gustavino

Istituto Nazionale di Fisica Nucleare

Cooperative Institutions

Centre National de la Recherche Scientifique

147

Institut National de Physique Nucléaire et de Physique des Particules

117

Istituto Nazionale di Fisica Nucleare

104

European Organization for Nuclear Research

100

Nagoya University

Institute for Nuclear Research

Laboratoire d’Annecy de Physique des Particules

Istituto Nazionale di Fisica Nucleare, Sezione di Napoli

Istituto Nazionale di Fisica Nucleare, Sezione di Bologna

A. Alikhanyan National Laboratory

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Measurement of the Velocity of Neutrinos from the CNGS Beam with the Large Volume Detector

Physical Review Letters (2012)

N. Yu. Agafonova M. Aglietta P. Antonioli V. V. Ashikhmin G. Bari

We report the measurement of the time of flight of $\ensuremath{\sim}17\text{ }\text{ }\mathrm{GeV}$ ${\ensuremath{\nu}}_{\ensuremath{\mu}}$ on the CNGS baseline (732 km) with the Large Volume Detector (LVD) at the Gran Sasso Laboratory. The CERN-SPS accelerator has been operated from May 10th to May 24th 2012, with a tightly bunched-beam structure to allow the velocity of neutrinos to be accurately measured on an event-by-event basis. LVD has detected 48 neutrino events, associated with the beam, with a high absolute time accuracy. These events allow us to establish the following limit on the difference between the neutrino speed and the light velocity: $\ensuremath{-}3.8\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}<({v}_{\ensuremath{\nu}}\ensuremath{-}c)/c<3.1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$ (at 99% C.L.). This value is an order of magnitude lower than previous direct measurements.

10.1103/physrevlett.109.070801

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Citations (42)

Measurement of Seasonal Variations of Horizontal Muons with Underground LVD Setup

Physics of Atomic Nuclei (2020)

N. Yu. Agafonova V. V. Ashikhmin E. A. Dobrynina A. S. Malgin O. G. Ryazhskaya

Zenith

10.1134/s1063778820010020

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Neutrons produced by muons in LVD: Monte Carlo simulation

Journal of Physics Conference Series (2013)

N. Yu. Agafonova V. V. Ashikhmin V. L. Dadykin R. I. Enikeev A. S. Malgin

The results of Monte-Carlo simulations of neutron production by muons in LVD obtained with Geant4 and SHIELD programs are presented. The detection efficiencies of gammas and neutons in the LVD are calculated.

10.1088/1742-6596/409/1/012139

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Citations (1)

First events of the CNGS beam detected by LVD

N. Yu. Agafonova M. Aglietta P. Antonioli G. Bari A. Bonardi

Source

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Update to 2005 of the results of the search for neutrino bursts fromgravitational stellar collapse with LVD

A. Porta N. Yu. Agafonova F. E. Kemp

Source

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Search forν_μ→ν_τoscillation with the OPERA experiment in the CNGS beam

New Journal of Physics (2012)

N. Yu. Agafonova А. Александров O. Altinok A. Anokhina S. Aoki

The OPERA neutrino experiment in the underground Gran Sasso Laboratory (LNGS) was designed to perform the first detection of neutrino oscillations in direct appearance mode in the ν µ → ν τ channel, the ν τ signature being the identification of the τ -lepton created in its charged current interaction.

Charged current

Particle identification

Electron neutrino

10.1088/1367-2630/14/3/033017

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Citations (24)

Final results of the search for νμ → νe oscillations with the OPERA detector in the CNGS beam

Journal of High Energy Physics (2018)

N. Yu. Agafonova А. Александров A. Anokhina Sinya Aoki A. Ariga

A bstract The OPERA experiment has discovered the tau neutrino appearance in the CNGS muon neutrino beam, in agreement with the 3 neutrino flavour oscillation hypothesis. The OPERA neutrino interaction target, made of Emulsion Cloud Chambers, was particularly efficient in the reconstruction of electromagnetic showers. Moreover, thanks to the very high granularity of the emulsion films, showers induced by electrons can be distinguished from those induced by π 0 s, thus allowing the detection of charged current interactions of electron neutrinos. In this paper the results of the search for electron neutrino events using the full dataset are reported. An improved method for the electron neutrino energy estimation is exploited. Data are compatible with the 3 neutrino flavour mixing model expectations and are used to set limits on the oscillation parameters of the 3+1 neutrino mixing model, in which an additional mass eigenstate m 4 is introduced. At high Δ m 41 2 (≳0.1 eV 2 ), an upper limit on sin 2 2 θ μe is set to 0.021 at 90% C.L. and Δ m 41 2 ≳ 4 × 10 − 3 eV 2 is excluded for maximal mixing in appearance mode.

Muon neutrino

Electron neutrino

Tau neutrino

Charged current

Oscillation (cell signaling)

Solar neutrino problem

10.1007/jhep06(2018)151

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Temporal characteristics of light collection in the liquid scintillation counter with a volume of 1.5 m3 and quasi-mirror reflection

Instruments and Experimental Techniques (2010)

N. Yu. Agafonova V. V. Boyarkin A. S. Malgin

Reflection

10.1134/s0020441210060060

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Latest results of the OPERA experiment on nu-tau appearance in the CNGS neutrino beam

arXiv (Cornell University) (2018)

N. Yu. Agafonova A. Alexandrov A. Anokhina S. Aoki A. Ariga

OPERA is a long-baseline experiment designed to search for $\nu_{\mu}\to\nu_{\tau}$ oscillations in appearance mode. It was based at the INFN Gran Sasso laboratory (LNGS) and took data from 2008 to 2012 with the CNGS neutrino beam from CERN. After the discovery of $\nu_\tau$ appearance in 2015, with $5.1\sigma$ significance, the criteria to select $\nu_\tau$ candidates have been extended and a multivariate approach has been used for events identification. In this way the statistical uncertainty in the measurement of the oscillation parameters and of $\nu_\tau$ properties has been improved. Results are reported.

Charged current

Oscillation (cell signaling)

Sigma

10.48550/arxiv.1811.00095

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On the Mechanism of Temperature Variations in the Average Energy of Muons at Large Depths

Journal of Experimental and Theoretical Physics (2021)

N. Yu. Agafonova A. S. Malgin

Solid-state physics

10.1134/s1063776121010088

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Citations (3)