A5090616899- Atomic and Subatomic Physics Research
- Nuclear Physics and Applications
- Quantum, superfluid, helium dynamics
- Cold Atom Physics and Bose-Einstein Condensates
- Nuclear reactor physics and engineering
- Radiation Detection and Scintillator Technologies
- European Union Policy and Governance
- High-pressure geophysics and materials
- European and International Law Studies
- Diamond and Carbon-based Materials Research
- Dark Matter and Cosmic Phenomena
- Radioactive Decay and Measurement Techniques
- EU Law and Policy Analysis
- Nuclear Materials and Properties
- Planetary Science and Exploration
- International Development and Aid
- Political Conflict and Governance
- Nuclear physics research studies
- Crystallography and Radiation Phenomena
- Particle physics theoretical and experimental studies
- Global Political and Economic Relations
- Cold Fusion and Nuclear Reactions
- Nuclear materials and radiation effects
- Medical Imaging Techniques and Applications
- Advanced Frequency and Time Standards
Erasmus University Rotterdam
2020-2024
Joint Institute for Nuclear Research
2012-2023
Oldham Council
2022
Brussels School of International Studies
2022
University of Liège
2022
Leiden University
2018-2019
Institut Laue-Langevin
2005-2019
Maastricht University
2010-2017
Montreal Council on Foreign Relations
2015
Institute for Nuclear Research
1996-2011
The lowest stationary quantum state of neutrons in the Earth's gravitational field is identified measurement neutron transmission between a horizontal mirror on bottom and an absorber top. Such assembly not transparent for if height smaller than "height" state.
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;...
In present paper, an approach for high yield compact D-D neutron generator based on a current gasdynamic electron cyclotron resonance ion source is suggested. Results dense pulsed deuteron beam production with up to 500 mA and density 750 mA/cm2 are demonstrated. Neutron from D2O TiD2 targets was measured in case of its bombardment by 300 D+ 45 keV energy. at target surface 109 s−1 cm−2 detected system two 3He proportional counters. Estimations obtained experimental results show that quality...
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.
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...
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...
The article addresses the question of how parliamentary actors, namely party groups, administrators and committees, interact with each other in new post-Lisbon institutional environment. On basis assessing scrutiny EU proposals spheres pensions labour migration parliaments Sweden, Czech Republic Romania, comes to conclusion that despite existing opportunities for committees obtain greater leverage, groups continue play a crucial role defining outcomes process. Parliamentary tend focus on...
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...
It is known that losses of ultra-cold neutrons (UCN) from traps are due to the β-decay, up scattering and absorption on a surface but we have identified for first time complementary mechanism. We suppose this arises an increase in energy resulting upper spectral cut-off which about twice higher than initial stored neutrons. The total probability such process equals ~10−5 per collision with trap wall made stainless steel without or Fomblin oil grease coating.