P. Iaydjiev
A5030798336- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Computational Physics and Python Applications
- Neutrino Physics Research
- Atomic and Subatomic Physics Research
- Quantum, superfluid, helium dynamics
- Black Holes and Theoretical Physics
- Medical Imaging Techniques and Applications
- Astrophysics and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Cold Atom Physics and Bose-Einstein Condensates
- Nuclear Physics and Applications
- Distributed and Parallel Computing Systems
- Gamma-ray bursts and supernovae
- Nuclear reactor physics and engineering
- Muon and positron interactions and applications
- Particle Accelerators and Free-Electron Lasers
- Noncommutative and Quantum Gravity Theories
- CCD and CMOS Imaging Sensors
- Radiation Therapy and Dosimetry
- Big Data Technologies and Applications
Institute for Nuclear Research and Nuclear Energy
2016-2025
Bulgarian Academy of Sciences
2014-2025
Institute of High Energy Physics
2012-2024
University of Antwerp
2024
A. Alikhanyan National Laboratory
2022-2024
European Organization for Nuclear Research
2011-2023
Sofia University "St. Kliment Ohridski"
2023
Rutherford Appleton Laboratory
2007-2020
Florida Institute of Technology
2018
Universidade Federal do ABC
2014
An experimental search for an electric dipole moment (EDM) of the neutron has been carried out at Institut Laue-Langevin, Grenoble. Spurious signals from magnetic-field fluctuations were reduced to insignificance by use a cohabiting atomic-mercury magnetometer. Systematic uncertainties, including geometric-phase-induced false EDMs, have carefully studied. The results may be interpreted as upper limit on EDM $|{d}_{n}|<2.9\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}26}e\text{...
We present the result of an experiment to measure electric dipole moment (EDM) neutron at Paul Scherrer Institute using Ramsey's method separated oscillating magnetic fields with ultracold neutrons (UCN). Our measurement stands in long history EDM experiments probing physics violating time reversal invariance. The salient features this were use a Hg-199 co-magnetometer and array optically pumped cesium vapor magnetometers cancel correct for field changes. statistical analysis was performed...
We present for the first time a detailed and comprehensive analysis of experimental results that set current world sensitivity limit on magnitude electric dipole moment (EDM) neutron. have extended enhanced our earlier to include recent developments in understanding effects gravity depolarizing ultracold neutrons (UCN); an improved calculation spectrum neutrons; conservative estimates other possible systematic errors, which are also shown be consistent with more measurements undertaken...
The latest neutron electric dipole moment (EDM) experiment has been collecting data at the Institut Laue-Langevin (ILL), Grenoble, since 1996. It uses an atomic-mercury magnetometer to compensate for magnetic field fluctuations that were principal source of systematic errors in previous experiments. first results, combination with ILL measurement, yield a possible range values $(\ensuremath{-}7.0<{d}_{n}<5.0)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}26}e\mathrm{cm}$ ( $90%$...
We report on a search for ultralow-mass axionlike dark matter by analyzing the ratio of spin-precession frequencies stored ultracold neutrons and 199Hg atoms an axion-induced oscillating electric dipole moment neutron axion-wind effect. No signal consistent with is observed axion mass range 10−24≤ma≤10−17 eV. Our null result sets first laboratory constraints coupling to gluons, which improve astrophysical limits up 3 orders magnitude, also improves previous nucleons factor 40.Received 29...
Theories are developed to evaluate Larmor frequency shifts, derived from geometric phases, in experiments measure electric dipole moments (EDM's) of trapped, atoms, molecules, and neutrons. A part these shifts is proportional the applied field can be interpreted falsely as an moment. comparison made between our theoretical predictions for some results recent experiments, which shows agreement within experimental errors 15%. The also demonstrates that trapped particle EDM have reached a...
A clock comparison experiment, analyzing the ratio of spin precession frequencies stored ultracold neutrons and 199Hg atoms, is reported. No daily variation this could be found, from which set an upper limit on Lorentz invariance violating cosmic anisotropy field b perpendicular < 2 x 10(-20) eV (95% C.L.). This first for free neutron. result also interpreted as a direct gravitational dipole moment neutron |gn| 0.3 eV/c2 m spin-dependent interaction with Sun. Analyzing Earth, based previous...
We performed ultracold neutron storage measurements to search for additional losses due (n) mirror-neutron (n′) oscillations as a function of an applied magnetic field B. In the presence mirror B′, would be maximal B≈B′. did not observe any indication nn′ and placed lower limit on oscillation time τnn′>12.0 s at 95% C.L. B′ between 0 12.5 μT.Received 26 May 2009DOI:https://doi.org/10.1103/PhysRevD.80.032003©2009 American Physical Society
The measurement of the neutron electric dipole moment (nEDM) constrains contribution CP-violating terms within both Standard Model and its extensions. experiment uses ultracold neutrons (UCN) stored in vacuum at room temperature. This technique provided last (and best) limit by RAL/Sussex/ILL collaboration 2006: dn < 2:9 × 10-26 e cm (90% C.L.). We aim to improve experimental sensitivity a factor 5 2-3 years, using an upgrade same apparatus. will take advantage increased density Paul...
The neutron gyromagnetic ratio has been measured relative to that of the 199Hg atom with an uncertainty 0.8 ppm. We employed apparatus where ultracold neutrons and mercury atoms are stored in same volume report result γn/γHg=3.8424574(30).
Magnetic-field uniformity is of the utmost importance in experiments to measure electric dipole moment neutron. A general parametrization magnetic field terms harmonic polynomial modes proposed, going beyond linear-gradients approximation. We review main undesirable effects nonuniformities: depolarization ultracold neutrons and Larmor frequency shifts mercury atoms. The theoretical predictions for these were verified by dedicated measurements with single-chamber neutron...
In view of the High Luminosity upgrade CERN LHC, forward CMS Muon spectrometer will be extended with two new stations improved Resistive Plate Chambers (iRPC) covering pseudorapidity range from 1.8 to 2.4. Compared present RPC system, gap thickness is reduced lower avalanche charge, and an innovative 2D strip readout geometry proposed. These improvements allow iRPC detector cope higher background rates. A Front-End-Board (FEB) designed signals a threshold as low 30 fC integrated Time Digital...
We compare the expected effects of so-called gravitationally enhanced depolarization ultracold neutrons to measurements carried out in a spin-precession chamber exposed variety vertical magnetic-field gradients. In particular, we have investigated dependence upon these field gradients spin-depolarization rates and also shifts measured neutron Larmor precession frequency. find excellent qualitative agreement, with accounting for several previously unexplained features data.Received 22 June...
A Reply to the Comment by S. K. Lamoreaux and R. Golub.Received 9 January 2007DOI:https://doi.org/10.1103/PhysRevLett.98.149102©2007 American Physical Society
We propose an original test of Lorentz invariance in the interaction between a particle spin and electromagnetic field report on first measurement using ultracold neutrons. used high-sensitivity neutron electric dipole moment (nEDM) spectrometer searched for direction dependence nEDM signal leading to modulation its magnitude at periods 12 24 hours. constrain such d12 < 10×10−25e cm d24 14×10−25e 95% C.L. The result translates into limit energy scale this type violation effect level εLV > 1010 GeV.
We have constructed an instrument, CryoEDM, to measure the neutron electric dipole moment a precision of 10−28 e cm at Institut Laue-Langevin. The main characteristic is that it operating entirely in cryogenic environment, temperatures 0.7 K within superfluid helium. Ultracold neutrons are produced superthermal source and stored storage cell which held magnetic field. NMR measurements carried out look for any shifts Larmor precession frequency associated with field detected in-situ...