L. L. Kurchaninov
A5103326141- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Neutrino Physics Research
- Cosmology and Gravitation Theories
- Atomic and Molecular Physics
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Particle accelerators and beam dynamics
- Muon and positron interactions and applications
- Distributed and Parallel Computing Systems
- Cold Atom Physics and Bose-Einstein Condensates
- Medical Imaging Techniques and Applications
- Quantum, superfluid, helium dynamics
- Astrophysics and Cosmic Phenomena
- Nuclear Physics and Applications
- Particle Accelerators and Free-Electron Lasers
- Nuclear physics research studies
- Mass Spectrometry Techniques and Applications
- Superconducting Materials and Applications
- Black Holes and Theoretical Physics
- Scientific Research and Discoveries
TRIUMF
2016-2025
Brandeis University
2022-2024
A. Alikhanyan National Laboratory
2024
SR Research (Canada)
2024
Federación Española de Enfermedades Raras
2024
Atlas Scientific (United States)
2024
Kobe University
2019-2023
The University of Adelaide
2017-2023
European Organization for Nuclear Research
2010-2023
University of California, Santa Cruz
2023
Physicists have long wondered whether the gravitational interactions between matter and antimatter might be different from those itself. Although there are many indirect indications that no such differences exist weak equivalence principle holds, been direct, free-fall style, experimental tests of gravity on antimatter. Here we describe a novel direct test methodology; search for propensity antihydrogen atoms to fall downward when released ALPHA trap. In absence systematic errors, can reject...
The spectrum of the hydrogen atom has played a central part in fundamental physics over past 200 years. Historical examples its importance include wavelength measurements absorption lines solar by Fraunhofer, identification transition Balmer, Lyman and others, empirical description allowed wavelengths Rydberg, quantum model Bohr, capability electrodynamics to precisely predict frequencies, modern 1S-2S Hänsch precision few parts 1015. Recent technological advances have us focus on...
In 1928, Dirac published an equation 1 that combined quantum mechanics and special relativity. Negative-energy solutions to this equation, rather than being unphysical as initially thought, represented a class of hitherto unobserved unimagined particles-antimatter. The existence particles antimatter was confirmed with the discovery positron 2 (or anti-electron) by Anderson in 1932, but it is still unknown why matter, antimatter, survived after Big Bang. As result, experimental studies...
The observation of hyperfine structure in atomic hydrogen by Rabi and co-workers the measurement zero-field ground-state splitting at level seven parts 1013 are important achievements mid-twentieth-century physics. work that led to these also provided first evidence for anomalous magnetic moment electron, inspired Schwinger's relativistic theory quantum electrodynamics gave rise maser, which is a critical component modern navigation, geo-positioning very-long-baseline interferometry systems....
Abstract The photon—the quantum excitation of the electromagnetic field—is massless but carries momentum. A photon can therefore exert a force on an object upon collision 1 . Slowing translational motion atoms and ions by application such 2,3 , known as laser cooling, was first demonstrated 40 years ago 4,5 It revolutionized atomic physics over following decades 6–8 it is now workhorse in many fields, including studies degenerate gases, information, clocks tests fundamental physics. However,...
We report the application of evaporative cooling to clouds trapped antiprotons, resulting in plasmas with measured temperature as low 9 K. have modeled evaporation process for charged particles using appropriate rate equations. Good agreement between experiment and theory is observed, permitting prediction efficiency future experiments. The technique opens up new possibilities ions particular interest antiproton physics, where a precise $CPT$ test on antihydrogen long-standing goal.
A new measurement of the branching ratio R_{e/μ}=Γ(π^{+}→e^{+}ν+π^{+}→e^{+}νγ)/Γ(π^{+}→μ^{+}ν+π^{+}→μ^{+}νγ) resulted in R_{e/μ}^{exp}=[1.2344±0.0023(stat)±0.0019(syst)]×10^{-4}. This is agreement with standard model prediction and improves test electron-muon universality to level 0.1%.
A search for massive neutrinos has been made in the decay $\pi\rightarrow e^+ \nu$. No evidence was found extra peaks positron energy spectrum indicative of pion decays involving ($\pi\rightarrow \nu_h$). Upper limits (90 \% C.L.) on neutrino mixing matrix element $|U_{ei}|^2$ mass region 60--135 MeV/$c^2$ were set, which are %representing an order magnitude improvement over previous results.
Abstract Antihydrogen, a positron bound to an antiproton, is the simplest anti-atom. Its structure and properties are expected mirror those of hydrogen atom. Prospects for precision comparisons two, as tests fundamental symmetries, driving vibrant programme research. In this regard, limiting factor in most experiments availability large numbers cold ground state antihydrogen atoms. Here, we describe how improved synthesis process results maximum rate 10.5 ± 0.6 atoms trapped detected per...
In 1906, Theodore Lyman discovered his eponymous series of transitions in the extreme-ultraviolet region atomic hydrogen spectrum1,2. The patterns spectrum helped to establish emerging theory quantum mechanics, which we now know governs world at scale. Since then, studies involving Lyman-α line-the 1S-2P transition a wavelength 121.6 nanometres-have played an important part physics and astronomy, as one most fundamental Universe. For example, this has long been used by astronomers studying...
In the present work of PIENU experiment, heavy neutrinos were sought in pion decays π+→μ+ν at rest by examining observed muon energy spectrum for extra peaks addition to expected peak a light neutrino. No evidence was observed. Upper limits set on neutrino mixing matrix |Uμi|2 mass region 15.7–33.8 MeV/c2, improving previous results an order magnitude.
We have demonstrated storage of plasmas the charged constituents antihydrogen atom, antiprotons and positrons, in a Penning trap surrounded by minimum-B magnetic designed for holding neutral antiatoms. The comprises superconducting octupole two superconducting, solenoidal mirror coils. measured lifetimes antiproton positron combined Penning-neutral trap, compared these to without fields. well depth was 0.6 T, deep enough ground state atoms up about 0.4 K temperature. that both particle...
The ALPHA collaboration, based at CERN, has recently succeeded in confining cold antihydrogen atoms a magnetic minimum neutral atom trap and performed the first study of resonant transition anti-atoms. apparatus will be described herein, with emphasis on structural aspects, diagnostic methods techniques that have enabled trapping experimentation to achieved.
Evidence of massive neutrinos in the ${\ensuremath{\pi}}^{+}\ensuremath{\rightarrow}{e}^{+}\ensuremath{\nu}$ decay spectrum was sought with background ${\ensuremath{\pi}}^{+}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}\ensuremath{\rightarrow}{e}^{+}$ chain highly suppressed. Upper limits (90% C.L.) on neutrino mixing matrix element $|{U}_{ei}{|}^{2}$ mass region $60--129\text{ }\text{ }\mathrm{MeV}/{c}^{2}$ were set at level ${10}^{\ensuremath{-}8}$.
Stochastic acceleration applied to 1,000 trapped antihydrogen atoms yields a 20-fold reduction of the experimental upper bound on magnitude charge antihydrogen, which is expected be neutral. One most puzzling current questions in physics why we see so much more matter than antimatter Universe. Studying properties might give hints about reasons for this imbalance. According Standard Model particle physics, should neutral, but it challenging test experimentally as difficult produce and measure...
The ATLAS detector has been designed for operation at CERN's Large Hadron Collider. includes a complex system of liquid argon calorimeters. This paper describes the architecture and implementation custom front end electronics developed readout
Control of the radial profile trapped antiproton clouds is critical to trapping antihydrogen. We report first detailed measurements manipulation clouds, including areal density compressions by factors as large ten, manipulating spatially overlapped electron plasmas. show near-axis and its relation that plasma.
The properties of antihydrogen are expected to be identical those hydrogen, and any differences would constitute a profound challenge the fundamental theories physics. most commonly discussed antiatom-based tests these searches for antihydrogen-hydrogen spectral (tests CPT (charge-parity-time) invariance) or gravitational weak equivalence principle). Here we, ALPHA Collaboration, report different somewhat unusual test quantum anomaly cancellation. A retrospective analysis influence electric...