The upgraded near neutrino detector of the T2K experiment is briefly described. The central part is the 3D scintillator fine-grained detector (SuperFGD). The detector comprised of about 2 million 1 × 1 × 1 cm3 plastic scintillator cubes with three orthogonal holes for wavelength shifting fiber readout. It is used as an active neutrino target to detect charged particles and photons. A...
Current work aims at the study of heavy neutral leptons, or heavy neutrinos (N), in the mass range $<493 \, \text{MeV}/c^2$ [1]. These particles can be produced in charged pion and kaon decays in the T2K standard neutrino beam: $M^\pm \rightarrow l^\pm_\alpha N$, where ($M=\pi,K; \, \alpha=e,\mu$). Then, heavy neutrinos can decay in ND280 via the following two- and three-body decay modes: $N...
T2K (Tokai-to-Kamioka) [1] is a long-baseline accelerator experiment aimed at studying neutrino oscillations and searching for CP violation in the lepton sector. Reducing systematic uncertainties in the predicted event rates at the far detector Super-Kamiokande is essential for improving T2K’s sensitivity to the CP-violating phase. The ND280 near detector plays a key role in this task by...
The Tokai-to-Kamioka (T2K) experiment is a long-baseline neutrino oscillation experiment in Japan. T2K is designed to precisely measure neutrino oscillation parameters and search for CP violation in the lepton sector using an intense muon (anti)neutrino beam. Measurements with the near detector, ND280, are essential for constraining neutrino interaction models and the initial neutrino flux,...
An analysis of available experimental and observational data as well as some theoretical assumptions related to the masses and mixing angles and mixing phases of active and sterile neutrinos was conducted. Based on these experimental and theoretical results and the analysis, estimates of the masses and mixing parameters of active and sterile neutrinos were obtained. These estimates can be used...
Rapid technological advances pave the way for high-precision experiments, particularly in neutrino physics. Such enhanced precision offers new opportunities to search for new physics — physics beyond the Standard Model (BSM). In this context, neutrino scattering on matter is of particular interest, as it incorporates information regarding both the neutrino itself and the target matter.
From...
The DANSS detector recorded more than 10 million antineutrino events from a nuclear reactor in almost 10 years of continuous running. The data taking has stopped in February 2026 in order to perform a significant upgrade. The obtained data sample exceeds that of any other neutrino experiment in the world and features remarkably low contribution from the cosmic background below 2%. At the same...
We present measurements of the integral and spectral characteristics of the reactor electron antineutrino ($\bar{\nu}_e$) flux obtained with the iDREAM detector at Unit 3 of the Kalinin Nuclear Power Plant, which operates a VVER-1000 reactor. The measured positron spectrum from $\bar{\nu}_e$ interactions with protons in the iDREAM liquid scintillator is compared with a prediction based on the...
Most accurate antineutrino spectra from fission fragments of nuclear fuel fissile isotopes 235U,238U,239Pu,241Pu were obtained. These spectra were calculated when fitting experimental antineutrino spectrum by the calculated ones. As a result, high statistics experimental spectrum was described with the calculated one. New antineutrino spectra can predict inverse beta-decay cross section in...
The COHERENT collaboration is devoted to study of the Coherent Elastic
Neutrino-Nucleus Scattering (CEνNS) using the high-quality pion-decay-at-rest neutrino
source at the Spallation Neutron Source located in the Oak Ridge National Laboratory.
The CEvNS process is predicted in the Standard Model and it dominates in low-energy
neutrinos interactions with matter. Its measurement provides a...
The PandaX experiment at the China Jinping Underground Laboratory (CJPL) uses large-scale liquid-xenon time projection chambers to search for dark matter and other rare physical processes. PandaX-4T, with a multi-tonne xenon target, has accumulated extensive science data and established competitive constraints on WIMP dark matter, while significantly extending its physics program toward light...
The νGeN experiment is aimed to study reactor antineutrinos properties at Kalinin Nuclear Power Plant in Udomlya. The experimental setup is located at about 11 meters under 3.1 GWth reactor which is leading to an antineutrino flux of (3.9-4.4)*10$^{13}$ cm$^{-2}$ s$^{-1}$. To detect antineutrinos the low-background 1.4 kg HPGe detector with energy threshold less than 300 eV is used. Such a...
We present the results of the first search of reactor antineutrino capture on $^{72}$Ge with the metastable $^{72m}$Ga ($T_{1/2}$ = 39.7 ms, $E_{γ}$ = 119.7 keV) in the final state. The search is performed based on ~800 kg·days of data acquired by the νGeN 1.41-kg germanium spectrometer at the Kalinin nuclear power plant. An upper limit on exclusive $^{72}$Ge($\bar{ν}$, $e^+$)$^{72m}$Ga cross...
After an introduction to the theory of neutrino electromagnetic properties [1,2,3] and a discussion of existing experimental constraints on the magnetic moments of neutrinos and other electromagnetic characteristics obtained in ground-based experiments (including the latest estimates from XENONnT [4] and LUX-ZEPELIN [5]) and results from astrophysical observations [6,7], we present the new...
Superfluid helium-4 (He-II) is being considered as a detector material for light dark matter searches [1,2] and the observation of coherent elastic neutrino-atom scattering (CE$\nu$AS) [3]. It has extreme intrinsic radiopurity, high impedance to external vibration noise, and a unique quantum evaporation signal channel enabling the detection of phonon- and rotonlike modes via liberation of He-4...
An analysis of the most recent, most precise experimental data on neutron decay points to the need to extend the Standard Model by introducing an admixture of the right-handed vector boson $W_R$. A left-right asymmetric weak interaction model is presented, in which the sign of the mixing angle of $W_R$ and $W_L$ reverses upon the transition from $W^-$ to $W^+$. In this model, CP violation...
The formation of the Universe's baryon and lepton asymmetries is examined within the framework of a left-right asymmetric model of weak interaction. The presence of a right-handed vector boson admixture—with mixing angles of opposite signs for $W^-$ and $W^+$—results in differing lifetimes for neutrons and antineutrons, which decay via $W^-$ and $W^+$, respectively. This difference gives rise...
