S. Aghion
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View article: Hole and positron interaction with vacancies and p-type dopants in epitaxially grown silicon
Hole and positron interaction with vacancies and p-type dopants in epitaxially grown silicon Open
The concentration of vacancies and impurities in semiconductors plays a crucial role in determining their electrical, optical, and thermal properties. This study aims to clarify the nature of the interaction between positrons and ionized p…
View article: Gravity and antimatter: the AEgIS experiment at CERN
Gravity and antimatter: the AEgIS experiment at CERN Open
From the experimental point of view, very little is known about the gravitational interaction between matter and antimatter. In particular, the Weak Equivalence Principle, which is of paramount importance for the General Relativity, has no…
View article: Correction to: Compression of a mixed antiproton and electron non-neutral plasma to high densities
Correction to: Compression of a mixed antiproton and electron non-neutral plasma to high densities Open
View article: The AEgIS experiment: towards antimatter gravity measurements
The AEgIS experiment: towards antimatter gravity measurements Open
(Antimatter Experiment: Gravity, Interferometry, Spectroscopy) is a CERN based experiment aiming to probe the Weak Equivalence Principle of General Relativity with antimatter by studying free fall of antihydrogen in the Earth’s gravitation…
View article: Monte-Carlo simulation of positronium laser excitation and anti-hydrogen formation via charge exchange
Monte-Carlo simulation of positronium laser excitation and anti-hydrogen formation via charge exchange Open
View article: Imaging a positronium cloud in a 1 Tesla
Imaging a positronium cloud in a 1 Tesla Open
We report on recent developments in positronium work in the frame of antihydrogen production through charge exchange in the AEgIS collaboration [1]. In particular, we present a new technique based on spatially imaging a cloud of positroniu…
View article: The AEgIS experiment at CERN: Probing antimatter gravity
The AEgIS experiment at CERN: Probing antimatter gravity Open
The AE$\\overline{g}$IS experiment at CERN’s Antiproton Decelerator is set up to precisely measure the gravitational interaction between matter and antimatter. For this purpose, antihydrogen will be formed from cold antiprotons and positro…
View article: Positronium Rydberg excitation diagnostic in a 1T cryogenic environment
Positronium Rydberg excitation diagnostic in a 1T cryogenic environment Open
Forming a pulsed beam of cold antihydrogen using charge-exchange with Rydberg positronium (Ps) is the goal of the AEgIS collaboration, which aims to a first gravity measurement on neutral antimatter. Recently achieved results in Ps formati…
View article: Producing long-lived <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>2</mml:mn><mml:msup><mml:mrow><mml:mspace width="0.16em"/></mml:mrow><mml:mn>3</mml:mn></mml:msup><mml:mi>S</mml:mi></mml:mrow></mml:math> positronium via <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>3</mml:mn><mml:msup><mml:mrow><mml:mspace width="0.16em"/></mml:mrow><mml:mn>3</mml:mn></mml:msup><mml:mi>P</mml:mi></mml:mrow></mml:math> laser excitation in magnetic and electric fields
Producing long-lived positronium via laser excitation in magnetic and electric fields Open
Producing positronium (Ps) in the metastable 23S state is of interest for various applications in fundamental physics. We report here on an experiment in which Ps atoms are produced in this long-lived state by spontaneous radiative decay o…
View article: Antiproton tagging and vertex fitting in a Timepix3 detector
Antiproton tagging and vertex fitting in a Timepix3 detector Open
Studies of antimatter are important for understanding our universe at a fundamental level. There are still unsolved problems, such as the matter-antimatter asymmetry in the universe. The AEgIS experiment at CERN aims at measuring the gravi…
View article: Compression of a mixed antiproton and electron non-neutral plasma to high densities
Compression of a mixed antiproton and electron non-neutral plasma to high densities Open
We describe a multi-step “rotating wall” compression of a mixed cold antiproton–electron non-neutral plasma in a 4.46 T Penning–Malmberg trap developed in the context of the AEḡIS experiment at CERN. Such traps are routinely used for the p…
View article: AEgIS at ELENA: outlook for physics with a pulsed cold antihydrogen beam
AEgIS at ELENA: outlook for physics with a pulsed cold antihydrogen beam Open
The efficient production of cold antihydrogen atoms in particle traps at CERN’s Antiproton Decelerator has opened up the possibility of performing direct measurements of the Earth’s gravitational acceleration on purely antimatter bodies. T…
View article: Investigating the structure of crosslinked polymer brushes (brush-gels) by means of Positron Annihilation Spectroscopy
Investigating the structure of crosslinked polymer brushes (brush-gels) by means of Positron Annihilation Spectroscopy Open
View article: AEgIS latest results
AEgIS latest results Open
The validity of the Weak Equivalence Principle (WEP) as predicted by General Relativity has been tested up to astounding precision using ordinary matter. The lack hitherto of a stable source of a probe being at the same time electrically n…
View article: Towards the first measurement of matter-antimatter gravitational interaction
Towards the first measurement of matter-antimatter gravitational interaction Open
The AEgIS (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) is a CERN based experiment with the central aim to measure directly the gravitational acceleration of antihydrogen. Antihydrogen atoms will be produced via charge exc…
View article: Positronium for Antihydrogen Production in the AEGIS Experiment
Positronium for Antihydrogen Production in the AEGIS Experiment Open
The primary goal of the Antihydrogen Experiment: Gravity, Interferometry, Spectroscopy (AEGIS) collaboration is to measure for the first time precisely the gravitational acceleration of antihydrogen, HÂ ̄, a fundamental issue of contemporar…
View article: Nature and Distribution of Stable Subsurface Oxygen in Copper Electrodes During Electrochemical CO<sub>2</sub> Reduction
Nature and Distribution of Stable Subsurface Oxygen in Copper Electrodes During Electrochemical CO<sub>2</sub> Reduction Open
Oxide-derived copper (OD-Cu) electrodes exhibit higher activity than pristine copper during the carbon dioxide reduction reaction (CO2RR) and higher selectivity toward ethylene. The presence of residual subsurface oxygen in OD-C…
View article: The DAQ system for the AEḡIS experiment
The DAQ system for the AEḡIS experiment Open
In the sociology of small- to mid-sized (O(100) collaborators) experiments the issue of data collection and storage is sometimes felt as a residual problem for which well-established solutions are known. Still, the DAQ system can be one of…
View article: Probing the Impact of the Initiator Layer on Grafted-from Polymer Brushes: A Positron Annihilation Spectroscopy Study
Probing the Impact of the Initiator Layer on Grafted-from Polymer Brushes: A Positron Annihilation Spectroscopy Study Open
Grafting-from is the technique of choice to obtain polymer brushes. It is based on the growth of polymer chains directly from an initiator-functionalized surface, and its development gained momentum thanks to recent advances in controlled …
View article: Polymer rigidification in graphene based nanocomposites: Gas barrier effects and free volume reduction
Polymer rigidification in graphene based nanocomposites: Gas barrier effects and free volume reduction Open
View article: Characterization of a transmission positron/positronium converter for antihydrogen production
Characterization of a transmission positron/positronium converter for antihydrogen production Open
View article: Measurement of antiproton annihilation on Cu, Ag and Au with emulsion films
Measurement of antiproton annihilation on Cu, Ag and Au with emulsion films Open
The characteristics of low energy antiproton annihilations on nuclei (e.g. hadronization and product multiplicities) are not well known, and Monte Carlo simulation packages that use different models provide different descriptions of the an…
View article: Advances in Ps Manipulations and Laser Studies in the AEgIS Experiment
Advances in Ps Manipulations and Laser Studies in the AEgIS Experiment Open
Positronium (Ps), the unstable bound state of electron and positron, is a valuable system for neutral antimatter spectroscopic studies and for antihydrogen production. Forming a pulsed beam cold antihydrogen using charge-exchange with the …
View article: AEgIS Experiment: Status & Outlook
AEgIS Experiment: Status & Outlook Open
The AEGIS experiment 1 (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) is planned to perform the first measurement of the gravitational acceleration on antimatter by observing the free fall of antihydrogen atoms. By combinin…
View article: Laser excitation of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>n</mml:mi><mml:mo>=</mml:mo><mml:mn>3</mml:mn></mml:mrow></mml:math>level of positronium for antihydrogen production
Laser excitation of thelevel of positronium for antihydrogen production Open
We demonstrate the laser excitation of the n=3 state of positronium (Ps) in vacuum. A combination of a specially designed pulsed slow positron beam and a high-efficiency converter target was used to produce Ps. Its annihilation was recorde…
View article: Detection of low energy antimatter with emulsions
Detection of low energy antimatter with emulsions Open
Emulsion detectors feature a very high position resolution and consequently\nrepresent an ideal device when particle detection is required at the\nmicrometric scale. This is the case of quantum interferometry studies with\nantimatter, wher…
View article: Towards a gravity measurement on cold antimatter atoms
Towards a gravity measurement on cold antimatter atoms Open
The present status of the AEGIS experiment at CERN (AD-06), on the way of forming anti-hydrogen for a first gravity measurement, is reviewed. Recent results in trapping and cooling positrons and antiprotons in the main electromagnetic trap…
View article: Direct detection of antiprotons with the Timepix3 in a new electrostatic selection beamline
Direct detection of antiprotons with the Timepix3 in a new electrostatic selection beamline Open
View article: Probing antimatter gravity – The AEGIS experiment at CERN
Probing antimatter gravity – The AEGIS experiment at CERN Open
The weak equivalence principle states that the motion of a body in a gravitational field is independent of its structure or composition. This postulate of general relativity has been tested to very high precision with ordinary matter, but …
View article: Positron annihilation spectroscopy: a new frontier for understanding nanoparticle-loaded polymer brushes
Positron annihilation spectroscopy: a new frontier for understanding nanoparticle-loaded polymer brushes Open
Nanoparticle-loaded polymer brushes are powerful tools for the development of innovative devices. However, their characterization is challenging and arrays of different techniques are typically required to gain sufficient insight. Here we …