The study of the spin effects and polarization phenomena in hadronic reactions requires the development of high intensity polarized beams, polarized targets, beam and focal polarimetry, systems of the spin manipulation and control as for the current spin experiments at the fixed targets as well as for the planned SPD experiment in collider mode at the Nuclotron/NICA complex.
The main...
We present cosmic muon flux measurements performed across two geomagnetically distinct environments with a novel concentric double-layer plastic scintillator telescope, developed and produced entirely in-house. The detector employs a nested geometry in which a cylindrical active core is coaxially enclosed by a cup-shaped outer scintillator, so that coincidence between the two optically...
The neutron instrument complex "Neutron Beta Decay" is currently being manufactured to be located on the beam of polarized cold neutrons on the GEK-3 N0 channel. The facility is designed to measure the electron, neutrino, and electron-neutrino asymmetries of neutron beta decay. The experiment is necessary because the results of the most recent, most precise neutron decay experiments, conducted...
New ultracold neutron source based on superfluid helium is being constructing at the PIK reactor for researches in the field of fundamental interactions physics. The use of superfluid helium will allow achieving an UCN density in the source chamber of 3400 cm-3, which is an order of magnitude higher than the current UCN density in sources around the world.
To create this UCN source some...
The fundamental process of coherent elastic neutrino-nucleus scattering (CEvNS) has been predicted based on the Standard Model of elementary particles and interactions more than 40 years ago. For heavy nuclei, the cross-section of this process exceeds (in more than two orders of magnitude) the cross-sections of other known low-energy neutrino interaction processes such as inverse beta decay...
A new highly granular time-of-flight neutron detector (HGND) is being developed and constructed for the BM@N (Baryonic Matter at the Nuclotron) experiment to identify neutrons and measure their energies in heavy-ion collisions at beam energies of up to 4 AGeV. The HGND consists of two arms, each with 8 active layers, each of 11×11 plastic scintillator cells 4×4×2.5 cm³ with direct light...
In nucleus-nucleus collisions at energies up to 2 GeV, neutrons constitute a significant fraction of
secondary particles. For their registration and identification, it is proposed to use modules of a High
Granularity Neutron Detector (HGND). The detector has a layered structure, where each active
layer consists of individual cells. This work considers the possibility of replacing passive...
A straw-tube forward tracking detector is being considered for the second stage of the Multi-Purpose Detector (MPD) at the NICA collider. It would extend the MPD acceptance to forward rapidities and broaden the accessible physics program. In central heavy-ion collisions, high hit density and ghost hits create a large combinatorial background, making robust track reconstruction challenging. We...
A wide range of applied research with accelerator ions beam is being implemented at the Flerov Laboratory of Nuclear Reactions JINR. Currently, more than 6,000 hours of accelerated time are allocated to such work per year. The volume of applied research is constantly increasing. To meet the requirements for beams and acceleration time, FLNR is implementing a program to create a new accelerator...
Precise determination of the event collision time t_{0} is essential for particle identification with time-of-flight detectors. In the ALICE experiment, the event time can be reconstructed from measured TOF signals by comparing them with expected flight times under different particle-mass hypotheses [1,2]. The corresponding optimization problem is combinatorial, and practical reconstruction...
To increase particle identification quality in the Spherical Neutral Detector (SND) at the VEPP-2000 electron-positron collider, we propose upgrading the ASHIPH (Aerogel, SHifter, PHotomultiplier) Cherenkov counters. With the replacement of the current microchannel-plate photomultipliers (MCP-PMTs) with silicon photomultipliers (SiPMs), we expect the number of detected photons per particle to...
Noble element detectors (two-phase emission detectors, liquid phase-only detectors, etc.) have many applications in modern research.
For example, they are broadly used in dark matter registration, non-standard neutrino interactions searches and even Standard Model processes observation (CEvNS). Modeling signal generation from these complicated interactions requires precise simulations. The...
The Baksan large neutrino telescope is a large-scale liquid scintillation detector under development at the Baksan neutrino observatory of the Institute for Nuclear Research of the Russian Academy of Sciences. The detector will employ a large number of photomultiplier tubes (PMTs). The Earth's magnetic field can significantly affect PMT perfomance and, consequently, the energy and timing...
The conceptual design of the SPASCHARM facility [1] calls for its relocation to channel No. 24 of the U-70 Accelerator Complex, with a muon detector positioned at the end of the facility. This detector is required to identify J/ψ particles via their decay into two muons (μ+μ−) and subsequently to search for χc2 (spin 2) and χc1 (spin 1) through their decays into J/ψ + γ, with the ultimate goal...
Radiation hardness studies of the CMS detector's cathode strip chambers have been conducted at the GIF++ gamma irradiation facility at CERN since 2016. During the studies, ME1/1 and ME2/1 chambers, which differ in design and operate in CMS under high background rate, were subjected to intense irradiation. The accumulated charge per unit length of the anode wire reached 1030 mC/cm for ME2/1 and...
The LHC Run 3 concluded in June 2026. Over nearly four years of operation, the ALICE experiment [1] collected $\sim$150 pb$^{-1}$ of $\text{pp}$ and $\sim$6.9 nb$^{-1}$ of the first $\text{Pb}{-}\text{Pb}$ collisions data, exceeding the cumulative dataset from previous Run 1 and Run 2. This period was also remarkable for the new
light-ion program, featuring the first $\text{Ne}{-}\text{Ne}$...
Homogeneous calorimeters based on scintillation single crystals are widely used in high-energy physics due to their good energy, position and time resolution. A small precise 256-channel photon spectrometer (PHOS256) based on PbWO$_4$ crystals is proposed for an experiment at the U-70 accelerator facility for measurements of spectra of neutral mesons and direct photons with proton, pion, and...
The front-end electronics of the modern experiments is often designed with the use of sampling ADC. The signal wave-form measured by such electronics carries information about the basic parameters of the signal of interest, its amplitude and time. Timing measurement of the sampled wave-form is a challenging task, especially when one aims for nanosecond and sub-nanosecond resolution having the...
This paper presents a statistical comparison of two methods for determining the velocity of a heavy ion using a semiconductor detector (PIN diode): the method based on a subjective optimization criterion that employs the mathematical formalism of subjective modeling (MFSM) proposed by Yu. P. Pytyev, and the generalized cross-validation (GCV) method. The MFSM makes it possible to formulate...
Unusual rectangular structures were observed for the first time using a resulting fragment mass–mass matrix in experiments on the FOBOS spectrometer studying the spontaneous fission of 248Cm and 252Cf nuclei. These structures are associated with a large "missing" mass and are bounded by magic nuclei, and they were interpreted as a manifestation of a new exotic decay mode – triple collinear...
Pyroelectric effect in some single crystals exposed to temperature variations under vacuum provides a simple route for producing and accelerating electron beams. In particular, lithium tantalate (LiTaO₃) crystals can generate electric field strong enough to accelerate electrons to energies exceeding 100 keV. This principle forms the basis of pyroelectric accelerators—compact systems that...
This talk presents the construction and testing of a modular scintillation detector prototype designed to register low-energy neutrino-induced recoil electrons with sub-keV thresholds (<1 keV). The developed detector features a scalable architecture based on 64-channel layers of scintillation modules, which will contain four compact CsI(pure) crystals coupled to SiPM matrices. Due to a high...
We report a systematic study of afterpulses with anomalously long delays in photomultiplier tubes (PMTs) with photocathode diameters ranging from 0.75 inch (Philips/HZC XP1911) to 20 inch (Hamamatsu R12860 and NNVT N6205). Our studies reveal a clear dependence of the afterpulse delay on the PMT geometry, specifically on the distance between the photocathode and the first dynode; for the...
The Hyper-Kamiokande experiment [1] aims for a search for CP violation in neutrino oscillations, proton decay, measurements of solar and atmospheric neutrinos, and other neutrino physics using a large water Cherenkov detector. The outer veto Chrenkov detector will use about 4000 optical modules based on PMT’s and wavelength-shifting (WLS) plates [2], which enhances light collection...
The development of efficient and cost-effective muon detection systems is an important task for future circular lepton colliders such as CEPC and FCC-ee. Within the R&D program for the AGORA detector concept, a scintillator-based muon system with wavelength-shifting (WLS) fiber readout is being investigated. The performance of such a detector depends on the scintillator geometry, the method of...
The work reports result of studies conducted to improve scintillation performance of plastic scintillators (PS) capable of neutron/gamma pulse-shape discrimination. A research group led by Zaitseva from LLNL made a major contribution to the field of development such materials. However, despite the accumulated experience of material production, there is a demand to modify their composition in...
Dual-phase liquid argon time projection chambers (LAr TPCs) are widely used in the direct
search for weakly interacting massive particles (WIMPs), traditionally targeting masses of
the order of 100 GeV. Future-generation LAr TPCs aim to extend this search towards lower
WIMP masses, down to the GeV scale. In this regime, WIMP interactions are expected to
produce nuclear recoils (NRs) in liquid...
Two-phase (liquid–gas) argon detectors exhibit good sensitivity to relatively low recoil-nucleus energies (~ 1 keV) — which is precisely why they have found widespread application in nuclear physics and astrophysics experiments. Scaling up to active masses of tens of tonnes opens up another area for them — WIMP searches. Reconstruction of the recoil-nucleus energy from the detector signal is...
Coherent elastic neutrino-nucleus scattering (CEvNS) was theoretically predicted in 1974 within the framework of the Standard Model of particle physics. It was experimentally observed for the first time only in 2017 by the COHERENT collaboration. The RED-100 two-phase emission detector was developed to study CEvNS on Xe and Ar nuclei.
Detector operation at a nuclear power plant in 2021-2022...
Isotope identification in multilayer silicon detectors requires joint reconstruction of mass number A and energy E. Different A–E pairs may yield nearly identical mean profiles, while deposited-energy fluctuations limit isotope separation. For partially stripped ions, stochastic electron capture and loss alter the charge state and add charge-exchange fluctuations, requiring explicit...
Prompt gamma-ray (PG) detection is a powerful method of the irradiation monitoring in Boron Neutron Capture Therapy (BNCT). Combination of intensity and position information gives a radiologist complementary information about tissues injure that allows to clarify the treatment plan.
Existing PG imaging systems are based on expansive materials with relatively weak radiation hardness. Here we...
We investigate Nd-containing mixed-halide perovskite quantum dots in organic liquids as candidate scintillation media for rare nuclear processes. Photoluminescence measurements have been completed for twelve compositions based on pseudocumene, dodecane, and syntin, with varying 2,5-diphenyloxazole (PPO) and naphthalene content. Comparative data analysis is ongoing.
In the analyzed pseudocumene...
