A5026638577- Atomic and Subatomic Physics Research
- Nuclear Physics and Applications
- Quantum, superfluid, helium dynamics
- Nuclear reactor physics and engineering
- Radiation Detection and Scintillator Technologies
- High-pressure geophysics and materials
- Cold Atom Physics and Bose-Einstein Condensates
- Diamond and Carbon-based Materials Research
- Nuclear Materials and Properties
- Advanced NMR Techniques and Applications
- Neutrino Physics Research
- Particle accelerators and beam dynamics
- Nuclear physics research studies
- Inorganic Fluorides and Related Compounds
- Electrohydrodynamics and Fluid Dynamics
- Photoreceptor and optogenetics research
- Advanced Memory and Neural Computing
- Aerosol Filtration and Electrostatic Precipitation
- Analytical Chemistry and Sensors
- Particle physics theoretical and experimental studies
- Twentieth Century Scientific Developments
- Particle Detector Development and Performance
- Nuclear and radioactivity studies
- Phase Equilibria and Thermodynamics
- International Science and Diplomacy
Joint Institute for Nuclear Research
2013-2024
Jagiellonian University
2023
Institute of Physics
2023
Dubna State University
2000-2022
Lomonosov Moscow State University
2020-2021
Ulyanovsk State University
2003-2013
Institute for Nuclear Research
2011
Triangle Universities Nuclear Laboratory
2009
Duke University
2009
Gettysburg College
2009
More than 15 years ago, the study of nanodiamond (ND) powders as a material for designing reflectors very cold neutrons (VCNs) and (CNs) began. Such can significantly increase efficiency using such expand scope their application solving applied fundamental problems. This review considers principle operation VCN CN based on ND advantages. Information is presented performed experimental theoretical studies effect size, structure, composition NDs reflectors. Methods chemical mechanical...
Diamond, with its exceptionally high optical nuclear potential and low absorption cross-section, is a unique material for series of applications in VCN (very cold neutron) physics techniques. In particular, powder diamond nanoparticles provides the best reflector neutrons complete energy range. It allowed also first observation quasi-specular reflection (CN) from disordered medium. Effective critical velocity such higher than that super-mirror. Nano-diamonds survive radiation fluxes;...
We report on storage of Very Cold Neutrons (VCN) in a trap with walls containing powder diamond nanoparticles. The efficient VCN reflection is provided by multiple diffusive elastic scattering at single nanoparticles powder. times are sufficiently long for accumulating large density neutrons complete energy range up to few 10(-4) eV. Methods further improvements discussed.
Nanomaterials, which show large reflectivity for external radiation, are of general interest in science and technology. We report a result from our ongoing research on the reflection low-energy neutrons powders detonation diamond nanoparticles. Our previous work showed probability quasispecular this medium. The model neutron scattering nanoparticles, we have developed, suggests two ways to increase probability: (1) reduction incoherent by substitution hydrogen with fluorine inside (2)...
Graphites covalently intercalated with fluorine to form (C2F)n structural type compounds shows a dramatic increase of the interlayer distance up by factor almost 3 reach ∼9 Å. Such graphite fluoride containing only carbon and offer rare opportunity bridge so-called gap in reflectivity neutron reflectors. Slow reflectors are great interest designing sources as well fundamental applied science; they require synthesizing high thermal chemical compound stability fluorides. In this work, new...
Abstract Studies of radioactive ions (RIs) are the most thriving field low-energy nuclear physics. In this paper, concept and scientific agenda prospective accelerator storage ring facility for RI beam (RIB) research proposed a large-scale international project based at Flerov Laboratory Nuclear Reactions Joint Institute Research. The motivation new is discussed its characteristics briefly presented shown to be comparable those advanced world centers, so-called “RIB factories”. project,...
Neutrons can be an instrument or object in many fields of research. Major efforts all over the world are devoted to improving intensity neutron sources and efficiency delivery for experimental installations. In this context, reflectors play a key role because they allow significant improvement both economy efficiency. For slow neutrons, Detonation NanoDiamond (DND) powders provide exceptionally good reflecting performance due combination enhanced coherent scattering low absorption. The...
If the wavelength of radiation and size inhomogeneities in medium are approximately equal, might be intensively scattered reflected from its surface. Such efficient nanomaterial reflectors great scientific technological interest. In previous works, we demonstrated a significant improvement efficiency reflection slow neutrons powder diamond nanoparticles by replacing hydrogen located on surface with fluorine removing residual sp2 amorphous shells via fluorination process. this paper, study...
We propose a new method for production of ultracold neutrons (UCNs) in superfluid helium. The principal idea consists installing helium UCN source into an external beam thermal or cold and surrounding this with solid methane moderator/reflector cooled down to ~4 K. moderator plays the role needed produce UCNs. flux accumulated could exceed incident due their numerous reflections from methane; also size be significantly larger than diameter. provide preliminary calculations cooling neutrons....
Over a decade ago, it was confirmed that detonation nanodiamond (DND) powders reflect very cold neutrons (VCNs) diffusively at any incidence angle and they quasi-specularly small angles. In the present publication, we report results of study on effect particle sizes overall efficiency neutron reflectors made DNDs. To perform this study, separated, by centrifugation, fraction finer DND nanoparticles (which are referred to as S-DNDs here) from broad initial size distribution experimentally...
Nanomaterials can intensively scatter and/or reflect radiation. Such processes and materials are of theoretical practical interest. Here, we study the quasi-specular reflections (QSRs) cold neutrons (CNs) very (VCNs) from nanodiamond (ND) powders. The fluorination ND increased its efficiency by removing/replacing hydrogen, which is otherwise dominant cause neutron loss due to incoherent scattering. probability diffuse reflection VCNs for certain wavelengths using appropriate sizes. Based on...
For more than a decade, detonation nanodiamond (DND) powders have been actively studied as material for efficient reflectors of very cold neutrons (VCNs) and neutrons. In this work, we experimentally demonstrate, the first time, possibility enhanced directional extraction VCN beam using reflector made fluorinated DND powder. With respect to theoretical flux calculated from an isotropic source at bottom cavity, gain in density along axis is ∼10 neutron velocities ∼57 ∼75 m/s. The use such...
We studied the phenomenon of relatively small changes in energy ultracold neutrons (UCN) (when compared to thermal motion energy) when these are reflected on a surface. The observed involved both increases UCN (their heating) and decreases (cooling) order ~ 10 -7 eV. probability values this process various surfaces ranged between -8 -5 per one collision; such heating was many times larger than that cooling. measured spectra heated dependence temperature sample out-gazing. found out-gazing...
We propose to perform the first measurement of neutron–neutron scattering cross section in through-channel pulsed aperiodic reactor YAGUAR (Snezhinsk, Russia). Such a directly determines length, and by comparison with proton–proton length bears upon issue charge symmetry nuclear force. The proposed experimental set-up, as well modelling neutron density frequency collisions is described. Experimental results are reported on formation optimization thermal field inside YAGUAR. instantaneous...