A5072646905- Atomic and Subatomic Physics Research
- Quantum, superfluid, helium dynamics
- Nuclear Physics and Applications
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Cold Atom Physics and Bose-Einstein Condensates
- Astrophysics and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Nuclear reactor physics and engineering
- Radioactive Decay and Measurement Techniques
- Advanced NMR Techniques and Applications
- Advanced Frequency and Time Standards
- Advanced MRI Techniques and Applications
- Quantum Chromodynamics and Particle Interactions
- Superconducting Materials and Applications
- Cosmology and Gravitation Theories
- Particle accelerators and beam dynamics
- Nuclear physics research studies
- Quantum Electrodynamics and Casimir Effect
- Particle Detector Development and Performance
- Graphite, nuclear technology, radiation studies
- Fusion materials and technologies
- Diamond and Carbon-based Materials Research
- Magnetic confinement fusion research
Kurchatov Institute
2014-2024
Petersburg Nuclear Physics Institute
2014-2023
Russian Academy of Sciences
2000-2011
Physico-Technical Institute
2006-2007
State Optical Institute named after SI Vavilov
2006
Paul Scherrer Institute
2003-2005
Kyoto University Research Reactor Institute
2005
Vifor Pharma (Switzerland)
2005
Austrian Academy of Sciences
2005
ETH Zurich
2005
Neutron lifetime is one of the most important physical constants: it determines parameters weak interaction and predictions primordial nucleosynthesis theory. There remains unsolved problem a 3.9\ensuremath{\sigma} discrepancy between measurements this using neutrons in beams those with stored ultracold (UCN). In our experiment we measure trapped by Earth's gravity an open-topped vessel. Two configurations trap geometry are used to change mean frequency UCN collisions surfaces; achieved...
The experiment Neutrino-4 started in 2014 with a detector model and continued full-scale 2016--2021. In this article, we describe all the steps of preparatory work on experiment. We present results increased statistical accuracy provided to date. experimental setup is constructed measure flux spectrum reactor antineutrinos as function distance center active zone SM-3 (Dimitrovgrad, Russia) range 6--12 meters. Using collected data, performed model-independent analysis determine oscillation...
The violation of Baryon Number, $\mathcal{B}$, is an essential ingredient for the preferential creation matter over antimatter needed to account observed baryon asymmetry in universe. However, such a process has yet be experimentally observed. HIBEAM/NNBAR %experiment program proposed two-stage experiment at European Spallation Source (ESS) search number violation. will include high-sensitivity searches processes that violate by one or two units: free neutron-antineutron oscillation...
Our experiment using gravitationally trapped ultracold neutrons (UCN) to measure the neutron lifetime is reviewed. Ultracold were in a material bottle covered with perfluoropolyether. The was deduced from comparison of UCN losses traps different surface-to-volume ratios. precise value fundamental importance particle physics and cosmology. In this experiment, storage time brought closer than any experiments before: probability trap only 1% that for $\ensuremath{\beta}$ decay. obtained,...
The idea of a hidden sector mirror partners elementary particles has attracted considerable interest as possible candidate for dark matter. Recently it was pointed out by Berezhiani and Bento that the present experimental data cannot exclude possibility rapid oscillation neutron n to n' with time much smaller than lifetime. A dedicated search vacuum transitions n->n' be performed at weak magnetic field, where both states are degenerate. We report result our experiment, which compares...
Ultra-cold neutrons (UCN), with energies low enough to be confined by the Fermi potential in material bottles, are playing an increasing role measurements of fundamental properties neutron. The ability manipulate UCN guides and magnetic fields, gravity can lead experiments lower systematic errors than have been obtained cold neutron beams. densities provided existing reactor sources limit these experiments. promise much higher from solid deuterium has led proposed facilities coupled both...
This report, prepared for the Community Planning Study - Snowmass 2013 summarizes theoretical motivations and experimental efforts to search baryon number violation, focussing on nucleon decay neutron-antineutron oscillations. Present future experiments using large underground detectors, as well planned oscillation with free neutron beams are highlighted.
The search for an electric dipole moment (EDM) of the neutron is a crucial test theoretical particle physics models with violation time and spatial invariance. A new experiment recently has been carried out at High-Flux Reactor Institut Laue-Langevin, using upgraded double-chamber magnetic resonance spectrometer developed Petersburg Nuclear Physics Institute. result interpreted as upper limit on value EDM,...
The neutron's permanent electric dipole moment $d_n$ is constrained to below $3\times10^{-26} e~\text{cm}$ (90% C.L.) [ arXiv:hep-ex/0602020, arXiv:1509.04411 ], by experiments using ultracold neutrons (UCN). We plan improve this limit an order of magnitude or more with PanEDM, the first experiment exploiting ILL's new UCN source SuperSUN. SuperSUN expected provide a high density energies 80 neV, implying extended statistical reach respect existing sources, for that rely on long storage...
An analysis of data on measurements neutron lifetime is presented. The new most accurate result the measurement [Phys. Lett. B 605, 72 (2005)] $878.5\ifmmode\pm\else\textpm\fi{}0.8$ s, differs from world average value 667, 1 (2008)] $885.7\ifmmode\pm\else\textpm\fi{}0.8$ by 6.5 standard deviations. In this connection an and Monte Carlo simulation experiments 483, 15 (2000)] Rev. 63, 593 (1989)] carried out. Systematic errors about $\ensuremath{-}6$ s are found in each experiments. A summary...
The range of nucleon interaction 10−4 cm–1 cm is interesting because it corresponds to the mass an intermediate particle within so-called "axion window" that not closed yet by experiment. Depolarization ultracold neutrons (UCN) during their storage in material traps can be caused CP-violating pseudo-magnetic precession neutron spin vicinity unpolarized matter surface. Using experimental limits for UCN depolarization new constraints were set product gSgP dimensionless scalar and pseudo-scalar...
All results of the neutron lifetime measurements performed in last 20 years with ultracold storage method are a good agreement. These also consistent latest most accurate decay asymmetry within Standard Model. However, there is significant discrepancy at $3.6\ensuremath{\sigma}$ (1% probability) level between averaged result experiments and beam method. This article addresses possible causes discrepancy. We focused on finding spectrum systematic corrections experiment. Four separate sources...