A. Natochii
A5023735362- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Computational Physics and Python Applications
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Crystallography and Radiation Phenomena
- Black Holes and Theoretical Physics
- Radiation Detection and Scintillator Technologies
- Superconducting Materials and Applications
- Advanced X-ray Imaging Techniques
- Medical Imaging Techniques and Applications
- Particle accelerators and beam dynamics
- Atomic and Subatomic Physics Research
- Nuclear Physics and Applications
- Nuclear materials and radiation effects
- Scientific Computing and Data Management
- Calibration and Measurement Techniques
- Geophysical Methods and Applications
- Physics of Superconductivity and Magnetism
- Advanced NMR Techniques and Applications
- International Science and Diplomacy
- Nuclear physics research studies
University of Hawaii System
2020-2025
University of Hawaiʻi at Mānoa
2020-2024
Brookhaven National Laboratory
2024
High Energy Accelerator Research Organization
2024
Korea Institute of Science & Technology Information
2023
European Organization for Nuclear Research
2017-2022
Université Paris-Sud
2017-2022
Chonnam National University
2022
University of Bonn
2022
University of the Basque Country
2022
Bent silicon crystals mounted on high-accuracy angular actuators were installed in the CERN Super Proton Synchrotron (SPS) and extensively tested to assess feasibility of crystal-assisted collimation circular hadron colliders. The adopted layout was exploited regularly upgraded for about a decade by UA9 Collaboration. investigations provided compelling evidence strong reduction beam losses induced nuclear inelastic interactions aligned comparison with amorphous orientation. A conceptually...
In the bottomonium sector, hindered magnetic dipole transitions between P-wave states <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:msub><a:mrow><a:mi>h</a:mi></a:mrow><a:mrow><a:mi>b</a:mi></a:mrow></a:msub><a:mo stretchy="false">(</a:mo><a:mn>2</a:mn><a:mi>P</a:mi><a:mo stretchy="false">)</a:mo><a:mo stretchy="false">→</a:mo><a:msub><a:mrow><a:mi>χ</a:mi></a:mrow><a:mrow><a:mi>b</a:mi><a:mi>J</a:mi></a:mrow></a:msub><a:mo...
We report measurements of production cross sections for <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msup><a:mi>ρ</a:mi><a:mo>+</a:mo></a:msup></a:math>, <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:msup><c:mi>ρ</c:mi><c:mn>0</c:mn></c:msup></c:math>, <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"><e:mi>ω</e:mi></e:math>, <g:math xmlns:g="http://www.w3.org/1998/Math/MathML"...
The collimators in the SuperKEKB rings are indispensable for reducing beam background noise Belle II particle detectors and protecting essential components, such as final focusing superconducting quadrupole magnets, from beams that may deviate into abnormal orbits. This study developed a new robust collimator using carbon-fiber composite (CFC) head material to receive kicked by accidental firing of injection kicker. Simulation results confirmed CFC suppressed temperature rise caused hit...
In this paper we revisit the idea of measuring magnetic dipole moments charm baryons and, in particular, Λ + by studying spin precession induced strong effective field inside channels a bent crystal. We present detailed sensitivity study showing feasibility such an experiment at LHC coming years.
This paper is devoted to an experimental study of focusing and defocusing positively charged particle beams with the help specially bent single crystals. Four crystals have been fabricated for this purpose. The studies performed at CERN SPS in $400\text{ }\text{ }\mathrm{GeV}/c$ proton $180\text{ pion beams. results measurements beam envelopes are presented. rms size horizontal profile focus was 5--8 times smaller than exit measured focal lengths were 4--21 m. good agreement calculations....
Mitigation of beam backgrounds via collimators is critical for the success Belle II experiment at SuperKEKB electron-positron collider. We report on an improved simulation methodology, which includes a refined physical description and pipe, our first implementation collimator tip scattering, in existing particle tracking software has been embedded into new sequential framework. These improvements resolve longstanding discrepancies between measured predicted background levels, significantly...
In SuperKEKB, movable collimators reduce the beam background noise in Belle II particle detector and protect crucial machine components, such as final focusing superconducting quadrupole magnets (QCS), from abnormal losses. The challenges related to collimator, which were not properly considered at time of SuperKEKB design, have surfaced through experience with its operation. this paper, we report collimator operation strategy SuperKEKB. addition, a significant challenge collimation due...
We present a search for the decays of ${B}^{0}$ mesons into final state containing $\mathrm{\ensuremath{\Lambda}}$ baryon and missing energy. These results are obtained from $711\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data sample that contains $772\ifmmode\times\else\texttimes\fi{}{10}^{6}\text{ }B\overline{B}$ pairs was collected near $\mathrm{\ensuremath{\Upsilon}}(4S)$ resonance with Belle detector at KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. use events in...
In this paper, we discuss the theoretical framework and experimental measurements of magnetic moment charm baryons. The $\Lambda_c^+$ is particularly interesting since it equal to quark. moments other baryons, such as $\Xi_c$, allow perform detailed spectroscopy studies. $\Lambda_c$ can be determined using radiative charmonium decay present results show a tension with majority predictions. As recently pointed out, baryons directly measured bent-crystal experiments at LHC. possibility...
The Belle II experiment at the SuperKEKB electron-positron collider aims to collect an unprecedented data set of $\rm 50~{\rm ab}^{-1}$ study $CP$-violation in $B$-meson system and search for Physics beyond Standard Model (BSM). is already world's highest-luminosity collider. In order planned within approximately one decade, target reach a peak luminosity 6.3 \times 10^{35}~cm^{-2}s^{-1}$ by further increasing beam currents reducing beam-size interaction point squeezing betatron function...
We search for excited charmed baryons in the <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msubsup><a:mi mathvariant="normal">Λ</a:mi><a:mi>c</a:mi><a:mo>+</a:mo></a:msubsup><a:mi>η</a:mi></a:math> system using a data sample corresponding to an integrated luminosity of <d:math xmlns:d="http://www.w3.org/1998/Math/MathML" display="inline"><d:mn>980</d:mn><d:mtext> </d:mtext><d:mtext>...
Inelastic nuclear interaction probability of 400 GeV/c protons interacting with bent silicon crystals was investigated, in particular for both types installed at the CERN Large Hadron Collider beam collimation purposes. In comparison to amorphous scattering interaction, planar channeling this is $$\sim 36\%$$ quasi-mosaic type (planes (111)), and 27\%$$ strip (110)). Moreover, absolute inelastic axial orientation, along $$\langle 110\rangle $$ axis, estimated first time, finding a value...
Abstract The rate of inelastic nuclear interactions in a short bent silicon crystal was precisely measured for the first time using 180 GeV/c positive hadron beam produced North Experimental Area CERN SPS. An angular asymmetry dependence on orientation vicinity planar channeling minimum has been observed. For inspected crystal, this probability is about $$\sim 20\%$$ <mml:math...
The UA9 setup, installed in the Super Proton Synchrotron (SPS) at CERN, was exploited for a proof of principle double-crystal scenario, proposed to measure electric and magnetic moments short-lived baryons high-energy hadron collider, such as Large Hadron Collider (LHC). Linear angular actuators were used position crystals establish required beam configuration. Timepix detectors high-sensitivity Beam Loss Monitors observe deflected beams. scans allowed exploring particle interactions with...
The use of bent crystals for beam manipulation in particle accelerators is a well-assessed concept rapidly evolving into practical application. experiments the UA9 collaboration at CERN-SPS have played key role quantitative understanding channeling and volume reflection mechanisms. Investigation process close to circulating ideally requires vacuum detectors resolving single particle, which should be located inside pipe itself. Cherenkov radiators are potential candidates such functionality...
We describe the performance of Timepix silicon detector operation at SPS and H8 extracted beam line CERN. Some calibration results tuning will be discussed a new cluster analysis algorithm, to reconstruct particle hits, is described as well. investigated optimal acquisition setup for device in order use its full capabilities. A 4 planes hybrid pixel tested hodoscope 180 GeV/c pion beam, also with special 3 ns channeled proton bunch sequence inside accelerator. Spatial angular distributions...