A5104454966- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Electron and X-Ray Spectroscopy Techniques
- Medical Imaging Techniques and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Radiation Detection and Scintillator Technologies
- Nuclear Physics and Applications
- Superconducting Materials and Applications
- Laser-Matter Interactions and Applications
- Particle Accelerators and Free-Electron Lasers
- Astrophysics and Cosmic Phenomena
- Laser Design and Applications
- Radioactive Decay and Measurement Techniques
- Air Quality Monitoring and Forecasting
- Cold Fusion and Nuclear Reactions
- Quantum Mechanics and Applications
- Neural Networks and Applications
- Graphite, nuclear technology, radiation studies
- Particle accelerators and beam dynamics
- X-ray Spectroscopy and Fluorescence Analysis
- Advancements in Photolithography Techniques
- Nuclear physics research studies
Institute for Physics
2024
Horia Hulubei National Institute for R and D in Physics and Nuclear Engineering
2003-2024
Universidade de Santiago de Compostela
2014-2015
European Organization for Nuclear Research
2011
The goal of the DIRAC experiment at CERN (PS212) is to measure $\pi^+\pi^-$ atom lifetime with 10% precision. Such a measurement would yield precision 5% on value $S$-wave $\pi\pi$ scattering lengths combination $|a_0-a_2|$. Based part collected data we present first result lifetime, $\tau=[2.91 ^{+0.49}_{-0.62}]\times 10^{-15}$ s, and discuss major systematic errors. This corresponds $|a_0-a_2|=0.264 ^{+0.033}_{-0.020} m_{\pi}^{-1}$.
The DIRAC experiment at CERN has achieved a sizeable production of $\pi^+\pi^-$ atoms and significantly improved the precision on its lifetime determination. From sample 21227 atomic pairs, 4% measurement S-wave $\pi\pi$ scattering length difference $|a_0-a_2| = (.0.2533^{+0.0080}_{-0.0078}|_\mathrm{stat}.{}^{+0.0078}_{-0.0073}|_\mathrm{syst})M_{\pi^+}^{-1}$ been attained, providing an important test Chiral Perturbation Theory.
The results of a search for hydrogen-like atoms consisting $\pi^{\mp}K^{\pm}$ mesons are presented. Evidence $\pi K$ atom production by 24 GeV/c protons from CERN PS interacting with nickel target has been seen in terms characteristic pairs their breakup the same ($178 \pm 49$) and Coulomb final state interaction ($653 42$). Using these analysis yields first value lifetime $\tau=(2.5_{-1.8}^{+3.0})$ fs model-independent measurement S-wave isospin-odd scattering length...
The observation of hydrogenlike πK atoms, consisting π^{-}K^{+} or π^{+}K^{-} mesons, is presented. atoms are produced by 24 GeV/c protons from the CERN PS accelerator, interacting with platinum nickel foil targets. breakup (ionization) in same targets yields characteristic pairs, called "atomic pairs," small relative momenta Q pair center-of-mass system. upgraded DIRAC experiment observed 349±62 such atomic corresponding to a signal 5.6 standard deviations. This first statistically...
The goal of the DIRAC experiment at CERN is to measure with high precision lifetime π + -atom (A 2π ), which order 3×10 -15 s, and thus determine s-wave ππ-scattering lengths difference |a 0 -a 2 |.A atoms are detected through characteristic features -pairs from atom break-up (ionization) in target.We report on a first statistics atomic data sample obtained p Ni interactions 24 GeV/c proton momentum present methods separate signal background.
We present evidence for the first observation of electromagnetically bound $\pi^\pm K^\mp$-pairs ($\pi K$-atoms) with DIRAC experiment at CERN-PS. The $\pi K$-atoms are produced by 24 GeV/c proton beam in a thin Pt-target and $\pi^\pm$ $K^\mp$-mesons from atom dissociation analyzed two-arm magnetic spectrometer. observed enhancement low relative momentum corresponds to production 173 $\pm$ 54 K$-atoms. mean life is related s-wave K$-scattering lengths, measurement which goal experiment. From...
After observing and investigating the double-exotic (a atom is a bound system, in which both oppositely charged components are unstable particles like μ,π,K,…) π+π− with ground state lifetime τ of about 3×10−15 s, upgraded DIRAC experiment at CERN PS accelerator observes for first time long-lived states same lifetimes 10−11 s more. The number characteristic pion pairs resulting from breakup (ionisation) atoms amounts to 436±61, corresponding signal-to-error ratio better than 7 standard...
After having announced the statistically significant observation (5.6~$\sigma$) of new exotic $\pi K$ atom, DIRAC experiment at CERN proton synchrotron presents measurement corresponding atom lifetime, based on full data sample: $\tau = (5.5^{+5.0}_{-2.8}) \cdot 10^{-15}s$. By means a precise relation ($<1\%$) between lifetime and scattering length, following value for S-wave isospin-odd length $a_0^{-}~=~\frac{1}{3}(a_{1/2}-a_{3/2})$ has been derived: $\left|a_0^-\right|...
In this work the Coulomb effects (Coulomb correlations) in $\pi^+\pi^-$ pairs produced p + Ni collisions at 24 GeV/$c$, are studied using experimental pair distributions $Q$, relative momentum center of mass system (c.m.s), and its projections $Q_L$ (longitudinal component) $Q_t$ (transverse to direction laboratory (l.s.). The $Q_L$, {\sl pairs} c.m.s. have been simulated assuming they described by phase space modified known point-like correlation function $A_C(Q)$, corrected for small due...
In this work, the Coulomb effects (Coulomb correlations) in <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msup><a:mi>π</a:mi><a:mo>+</a:mo></a:msup><a:msup><a:mi>π</a:mi><a:mo>−</a:mo></a:msup></a:math> pairs produced <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mrow><c:mi mathvariant="normal">p</c:mi><c:mo>+</c:mo><c:mi>Ni</c:mi></c:mrow></c:math> collisions at <f:math xmlns:f="http://www.w3.org/1998/Math/MathML"...
The adapted DIRAC experiment at the CERN PS accelerator observed for first time long-lived hydrogenlike π^{+}π^{-} atoms, produced by protons hitting a beryllium target. A part of these atoms crossed gap 96 mm between target and 2.1 μm thick platinum foil, in which most them dissociated. Analyzing number atomic pairs, n_{A}^{L}=436_{-61}^{+157}|_{tot}, lifetime 2p state is found to be τ_{2p}=(0.45_{-0.30}^{+1.08}|_{tot})×10^{-11} s, not contradicting corresponding QED...
From the measured target thickness dependence of K x-ray and radiative electron capture (REC) yields in 0.75–2.5 MeV u−1 32S, 35Cl + Cu collisions, cross sections for production REC, on collision energy, have been determined. In comparison with theory, we find simple models that describe rather well some present results. The (Cu) are fair agreement ECPSSR model predictions. REC theoretical calculations (Stobbe times 11, number loosely bound electrons Cu) data Cl collision, but overestimate S...
Particle track reconstruction capabilities of the silicon tracking detector system have been studied. As multiple Coulomb scattering (MCS) induces unavoidable uncertainties on coordinate measurement, corresponding error estimates and associated correlations used to find best fit parameters their errors. Finally it permits proper particle characteristics, as vertex position resolution, flight direction error.
The commissioning of the high power laser facility Extreme Light Infrastructure - Nuclear Physics (ELI-NP) at Bucharest-Magurele (Romania) allows in-depth study nonlinear interactions in Strong Field Quantum Electrodynamics (SF-QED). present paper analyzes SF-QED processes possible to ELI-NP. Carrying out such experiments will allow finding answers many fundamental QED questions. After a brief review first experiment (E-144 SLAC) which confirmed existence high-energy electrons with photons...
The DIRAC experiment at CERN investigated in the reaction $\rm{p}(24~\rm{GeV}/c) + Ni$ particle pairs $K^+K^-, \pi^+ \pi^-$ and $p \bar{p}$ with relative momentum $Q$ pair system less than 100 MeV/c. Because of background influence studies, explored three subsamples $K^+K^-$ pairs, obtained by subtracting -- using time-of-flight (TOF) technique from initial distributions sample fractions more 70\%, 50\% 30\%. corresponding its longitudinal projection $Q_L$ were analyzed first a Coulomb...