M. Stoilov
A5065286573- Muon and positron interactions and applications
- Atomic and Molecular Physics
- Black Holes and Theoretical Physics
- Quantum Chromodynamics and Particle Interactions
- Nonlinear Waves and Solitons
- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Particle Detector Development and Performance
- X-ray Spectroscopy and Fluorescence Analysis
- Dark Matter and Cosmic Phenomena
- Algebraic structures and combinatorial models
- Noncommutative and Quantum Gravity Theories
- Homotopy and Cohomology in Algebraic Topology
- Nuclear physics research studies
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum and Classical Electrodynamics
- Spectral Theory in Mathematical Physics
- Advanced Fiber Laser Technologies
- Spectroscopy and Laser Applications
- Particle accelerators and beam dynamics
- Laser-Matter Interactions and Applications
- Advanced Chemical Physics Studies
- Quantum chaos and dynamical systems
- High-Energy Particle Collisions Research
- Lung Cancer Research Studies
Institute for Nuclear Research and Nuclear Energy
2007-2024
Bulgarian Academy of Sciences
2011-2024
University of Bologna
2024
The Abdus Salam International Centre for Theoretical Physics (ICTP)
1996
Abstract The FAMU experiment aims to measure for the first time hyperfine splitting of muonic hydrogen ground state. From this measurement proton Zemach radius can be derived and will shed light on determination charge radius. In paper, we describe scientific goal, method detailed preparatory work. This includes outcome preliminary measurements, subsequent refined simulations evaluation expected results. experimental setup being built performed at RAL laboratory muon facility is also described.
The high precision measurement of the hyperfine splitting muonic-hydrogen atom ground state with pulsed and intense muon beam requires careful technological choices both in construction a gas target detectors. In June 2014, pressurized FAMU experiment was exposed to low energy at RIKEN RAL facility. objectives test were characterization target, hodoscope X-ray apparatus consisted X-rays detectors made purity Germanium Lanthanum Bromide crystals. this paper experimental setup is described...
Abstract The FAMU experiment at RIKEN-RAL is a muonic atom with the aim to determine Zemach radius of proton by measuring 1s hyperfine splitting in hydrogen. activity Collaboration years 2015–2023 enabled final optimisation detector-target setup as well gas working condition terms temperature, pressure and mixture composition. has started its data taking July 2023. status detector for 2023 experimental runs, beam characterisation X-ray detection 100–200 keV energy range, presented discussed.
We report the experimental determination of collision-energy dependence muon transfer rate from ground state muonic hydrogen to oxygen at near-thermal energies. A sharp increase by nearly an order magnitude in energy range 0--70 meV was found that is not observed other gases. The results set a reliable reference for quantum-mechanical calculations low-energy processes with exotic atoms and provide firm measurement hyperfine splitting Zemach radius proton FAMU collaboration.
The aim of the FAMU (Fisica degli Atomi Muonici) experiment is to realize first measurement hyperfine splitting (hfs) in 1S state muonic hydrogen Δ Ehfs1S, by using RIKEN-RAL intense pulsed muon beam and a high-energy mid-infrared tunable laser. This requires detailed study transfer mechanism at different temperatures hence epithermal states system. experimental setup involves cryogenic pressurized gas target detection system based on silicon photomultipliers-fiber hodoscopes high purity...
The article gives the motivations for measurement of hyperfine splitting (hfs) in ground state muonic hydrogen to explore properties proton at low momentum transfer. It summarizes these proposed methods and finally describes FAMU experiment more detail.
It is proposed by Chen et. al. to represent the gauge fields in theories with local symmetries as a sum of "physical" and "pure gauge" which be treated separately. Here we show that after quantization this representation leads model non equivalent initial one.
The FAMU experiment aims to accurately measure the hyperfine splitting of ground state muonic hydrogen atom. A measurement transfer rate muons from heavier gases is necessary for this purpose. In June 2014, within a preliminary experiment, pressurized gas-target was exposed pulsed low-energy muon beam at RIKEN RAL facility (Rutherford Appleton Laboratory, U.K.). main goal test characterization both noise induced by and X-ray detectors. apparatus, some extent rudimental, has served admirably...
We report the first measurement of temperature dependence muon transfer rate from $μ$p atoms to oxygen between 100 and 300 K. Data were obtained X-ray spectra delayed events in gaseous target H$_2$/O$_2$ exposed a beam. Based on data, we determined energy up 0.1 eV, showing an 8-fold increase contrast with predictions constant low limit. This work set constraints theoretical models transfer, is fundamental importance for hyperfine splitting by FAMU collaboration.
At present, the Boer-Mulders (BM) function for a given quark flavour is extracted from data on semi-inclusive deep inelastic scattering (SIDIS) using simplifying assumption that it proportional to Sivers flavour. In recent paper we suggested consistency of this could be tested information so-called difference asymmetries, i.e. between asymmetries in production particles and their anti-particles. paper, SIDIS COMPASS deuteron $\langle\cos\phi_h\rangle$, $\langle\cos 2 \phi_h\rangle$ carry out...
Abstract In this study, we explore the X-ray time spectra of muonic oxygen in various H 2 + O gaseous mixtures by means numerical simulations based on a sophisticated kineticrate equations model. Our primary focus is “two components” hypothesis, which was put forward to account for experimentally observed two successive exponential behaviors radiation time-distribution. To ensure an accurate representation physical processes experiments, incorporate precise transition rate coefficients...
The exact radial eigenfunctions of a relativistic binary atom bound by the static Coulomb force are calculated. We consider two-fermion Dirac equation for two distinguishable fermions (like, e.g., in positronium) including potential but no radiative corrections. As shown previous paper and its addendum this problem can be solved exactly [1]. Here we provide solution terms generalized hypergeometric functions hamiltonian, which determined through matrix recursion relation. Also, an equivalent...
The main goal of the FAMU experiment is measurement hyperfine splitting (hfs) in 1S state muonic hydrogen $\Delta E_{hfs}(\mu^-p)1S$. physical process behind this following: $\mu p$ are formed a mixture and higher-Z gas. When absorbing photon at resonance-energy E_{hfs}\approx0.182$~eV, subsequent collisions with surrounding $H_2$ molecules, quickly de-excited accelerated by $\sim2/3$ excitation energy. observable time distribution K-lines X-rays emitted from Z$ muon transfer $(\mu p) +Z...
We show that in some cases the gauge-invariant Pauli-Villars and higher (covariant) derivative regularizations are equivalent.
Using simulated data, obtained with the FLUKA code, we derive empirical regularities about propagation and stopping of low-energy negative muons in hydrogen selected solid materials. The results are intended to help preliminary stages set-up design for experimental studies muon capture muonic atom spectroscopy. Provided approximate expressions parameters momentum, spatial angular distribution propagating muons. In comparison available data on power range (with which they agree considered...
A new model of p-branes is introduced and studied. The general solution this equivalent to a particle the covariant p-brane problem which authors have obtained earlier. constraint algebra closed in sense that its structure functions are field independent.
Lagrange multipliers are present in any gauge theory. They possess peculiar transformation which is not generated by the constraints model as it case with other variables. For rank one theories we show how to alter so that they become generators of local symmetry algebra space too. We also discuss limitations on using different conditions and construct BRST charge corresponding newly found constraints.
We consider a simplified model of the optical multi-pass cavity that is being currently developed by FAMU collaboration for measurement hyperfine splitting in ground state muonic hydrogen and Zemach radius proton. The focused on time distribution events laser-stimulated transitions muonuc atom may be helpful preliminary design experimental set-up and, more generally, optimization cavities experiments with pulsed lasers.