A5084744176- Atomic and Molecular Physics
- Microstructure and mechanical properties
- Particle accelerators and beam dynamics
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced ceramic materials synthesis
- Dark Matter and Cosmic Phenomena
- Muon and positron interactions and applications
- Aluminum Alloy Microstructure Properties
- Microstructure and Mechanical Properties of Steels
- Nuclear materials and radiation effects
- Quantum, superfluid, helium dynamics
- Electron and X-Ray Spectroscopy Techniques
- Atomic and Subatomic Physics Research
- High Temperature Alloys and Creep
- Mass Spectrometry Techniques and Applications
- Aluminum Alloys Composites Properties
- Advanced Materials Characterization Techniques
- Hydrogen embrittlement and corrosion behaviors in metals
- Nuclear physics research studies
- Advancements in Solid Oxide Fuel Cells
- Safety Systems Engineering in Autonomy
- Advanced materials and composites
- Plasma Diagnostics and Applications
- Quantum and Classical Electrodynamics
- Advanced Electron Microscopy Techniques and Applications
Adelard
2017-2018
European Organization for Nuclear Research
2011-2017
Imperial College London
1980-2016
Swansea University
2008-2012
Simon Fraser University
2011
University of California, Berkeley
1970-2011
Universidade Federal do Rio de Janeiro
2009-2011
Aarhus University
2009-2011
TRIUMF
2009
American Ceramic Society
1985-1986
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...
Transmission electron microscopy (at 100 and 1000 kV potential) analytical scanning transmission were used to study α‐Al 2 0 3 second‐phase particles their interactions with grain boundaries in two high‐conductivity Y /Yb stabilized zirconia ceramics containing deliberate additions of the alumina as a sintering aid. Most Al intragranular microanalysis showed that they contained inclusions rich Zr or Si plus Zr. O at frequently associated amorphous cusp areas Al. The results suggest acts...
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...
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....
Discontinuous precipitation results in the formation of a two-phase lamellar structure behind moving grain-boundaries. The reaction is interest because it generally has deleterious effect on mechanical, physical, and chemical properties many commercial alloys. combination heterogeneous boundary concurrent migration complex resulted diverse range proposed mechanisms, several models growth kinetics, empirical observations effects ternary additions lattice strain. This review summarizes...
AbstractAn assessment has been made of the current interest and potential future zirconia ceramics for structural applications. Interest in mechanical properties based on, or containing, ZrO2 centres on manipulation tetragonal to monoclinic martensitic phase transformation. It will be demonstrated that maintenance a metastable is one most important factors optimum design strong tough ceramic. There are several microstructural approaches can taken achieve toughening either...
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.
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...
We demonstrate controllable excitation of the center-of-mass longitudinal motion a thermal antiproton plasma using swept-frequency autoresonant drive. When is cold, dense, and highly collective in nature, we observe that entire system behaves as single-particle nonlinear oscillator, predicted by recent theory. In contrast, only fraction antiprotons warm can be similarly excited. Antihydrogen was produced trapped this technique to drive into positron plasma, thereby initiating atomic recombination.
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.
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...