A. Demetrio
A5075216899- Atomic and Molecular Physics
- Muon and positron interactions and applications
- Particle accelerators and beam dynamics
- Cold Atom Physics and Bose-Einstein Condensates
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Advanced Chemical Physics Studies
- Quantum and Classical Electrodynamics
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Quantum Mechanics and Applications
- Astro and Planetary Science
- Quantum Electrodynamics and Casimir Effect
- Laser-induced spectroscopy and plasma
- Cold Fusion and Nuclear Reactions
- Quantum, superfluid, helium dynamics
- Plasma Diagnostics and Applications
- Human Mobility and Location-Based Analysis
- Nuclear Physics and Applications
- Nuclear physics research studies
- Pulsars and Gravitational Waves Research
- X-ray Spectroscopy and Fluorescence Analysis
- Neutrino Physics Research
- Advanced Frequency and Time Standards
Heidelberg University
2015-2021
Kirchhoff (Germany)
2015-2021
University of Brescia
2020
Max Planck Institute for Nuclear Physics
2017-2020
Institute for Physics
2018
Abstract Antihydrogen atoms with K or sub-K temperature are a powerful tool to precisely probe the validity of fundamental physics laws and design highly sensitive experiments needs antihydrogen controllable well defined conditions. We present here experimental results on production in pulsed mode which time when 90% produced is known an uncertainty ~250 ns. The source generated by charge-exchange reaction between Rydberg positronium atoms—produced via injection positron beam into...
We demonstrate the laser excitation of $n=3$ state positronium (Ps) in vacuum. A combination a specially designed pulsed slow positron beam and high-efficiency converter target was used to produce Ps. Its annihilation recorded by single-shot lifetime spectroscopy. Pulsed level at wavelength $\ensuremath{\lambda}\ensuremath{\approx}205$ nm monitored via Ps photoionization induced second intense pulse $\ensuremath{\lambda}=1064$ nm. About 15% overall emitted into vacuum excited photoionized....
We describe a system designed to re-bunch positron pulses delivered by an accumulator supplied source and Surko-trap. Positron from the are magnetically guided in 0.085 T field injected into region free of magnetic fields through μ-metal terminator. Here positrons temporally compressed, electrostatically accelerated towards porous silicon target for production emission positronium vacuum. Positrons focused spot less than 4 mm FWTM bunches ∼8 ns FWHM. Emission vacuum is shown single shot...
Positronium in the $2^{\phantom{\rule{0.16em}{0ex}}3}\mathrm{S}$ metastable state exhibits a low electrical polarizability and long lifetime (1140 ns), making it promising candidate for interferometry experiments with neutral matter-antimatter system. In present work, positronium is produced, absence of an electric field, via spontaneous radiative decay from $3^{\phantom{\rule{0.16em}{0ex}}3}\mathrm{P}$ level populated 205-nm UV laser pulse. Thanks to short temporal length pulse, 1.5 ns full...
Producing positronium (Ps) in the metastable $2^3\text{S}$ state is of interest for various applications fundamental physics. We report here about an experiment which Ps atoms are produced this long-lived by spontaneous radiative decay excited to $3^3\text{P}$ level manifold. The cloud excitation obtained with a UV laser pulse experimental vacuum chamber presence guiding magnetic field 25 mT and average electric 300 V/cm. indication production from novel analysis technique single-shot...
Abstract We describe a multi-step “rotating wall” compression of mixed cold antiproton–electron non-neutral plasma in 4.46 T Penning–Malmberg trap developed the context AEḡIS experiment at CERN. Such traps are routinely used for preparation antiprotons suitable antihydrogen production. A tenfold antiproton radius has been achieved, with minimum only 0.17 mm. experimental conditions necessary to perform such compression: minimizing tails electron density distribution is paramount ensure that...
For a public transport operator, estimating passenger flows is vital to plan inclusive and efficient service. Understanding where when optimally allocate resources results in better customer experiences, further shaping optimizing services. To this end, the project Mobile Data Fusion aims at developing technique collect, process, merge data from different sources. The are used inform operators about demand, by combining Wi-Fi Bluetooth signals devices with time-of-flight counting sensors....
The AEgIS (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) experiment is designed with the objective to test weak equivalence principle antimatter by studying free fall of antihydrogen in Earth's gravitational field. A pulsed cold beam will be produced charge exchange between Ps excited Rydberg state and antiprotons. Finally measured a classical moiré deflectometer. apparatus being assembled at Antiproton Decelerator CERN described, then advancements reported: positrons...
The efficient production of cold antihydrogen atoms in particle traps at CERN's Antiproton Decelerator has opened up the possibility performing direct measurements Earth's gravitational acceleration on purely antimatter bodies. goal AEgIS collaboration is to measure value
We investigate experimentally the possibility of enhancing production 23S positronium atoms by driving 13S–33P and 33P–23S transitions, overcoming natural branching ratio limitation spontaneous decay from 33P to 23S. The toward level has been efficiently stimulated a 1312.2 nm broadband IR laser pulse. dependence stimulating transition efficiency on intensity pulse measured find optimal enhancement conditions. A maximum relative increase ×(3.1±1.0) in efficiency, with respect case which only...
Forming a pulsed beam of cold antihydrogen using charge-exchange with Rydberg positronium (Ps) is the goal AEḡIS collaboration, which aims to first gravity measurement on neutral antimatter. Recently achieved results in Ps formation and laser spectroscopy main apparatus are summarized. First, has been produced nanochanneled silicon targets cryogenic environment (~ 15 K) 1 T magnetic field observed by means Single-Shot Positron Annihilation Lifetime Spectroscopy. The demonstration n=3...
The goal of the AEgIS experiment is to measure gravitational acceleration antihydrogen – simplest atom consisting entirely antimatter with ultimate precision 1%. We plan verify Weak Equivalence Principle (WEP), one fundamental laws nature, an beam. consists a positron accumulator, antiproton trap and Stark accelerator in solenoidal magnetic field form accelerate pulsed beam atoms towards free-fall detector. passes through moiré deflectometer vertical displacement due force. A position time...
Abstract From the experimental point of view, very little is known about gravitational interaction between matter and antimatter. In particular, Weak Equivalence Principle, which paramount importance for General Relativity, has not yet been directly probed with The main goal AEgIS experiment at CERN to perform a direct measurement force on idea measure vertical displacement beam cold antihydrogen atoms, traveling in field Earth, by means moiré deflectometer. An overview physics goals...
The characteristics of low energy antiproton annihilations on nuclei (e.g. hadronization and product multiplicities) are not well known, Monte Carlo simulation packages that use different models provide descriptions the annihilation events. In this study, we measured particle multiplicities resulting from nuclei. results were compared with predictions obtained using in tools GEANT4 FLUKA. For exposed thin targets (Cu, Ag Au) to a very beam CERN's Antiproton Decelerator, exploiting secondary...
We report on recent developments in positronium work the frame of antihydrogen production through charge exchange AEgIS collaboration [1]. In particular, we present a new technique based spatially imaging cloud by collecting positrons emitted photoionization. This background free diagnostic proves to be highly efficient and opens up opportunities for spectroscopy antimatter, control laser manipulation clouds as well Doppler velocimetry.
In this work we present a hybrid detection method providing simultaneous imaging and timing information suitable for fully monitoring positronium (Ps) formation, its laser excitation, spatial propagation the first trials of pulsed antihydrogen ( H) production through charge-exchange reaction with trapped antiprotons (p).This combined method, based on synchronous acquisition an EJ-200 scintillation detector microchannel plate (MCP) dual readout (phosphor screen image electrical pick-up...
The AEgIS (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) is a CERN based experiment with the central aim to measure directly gravitational acceleration of antihydrogen. Antihydrogen atoms will be produced via charge exchange reactions which consist Rydberg-excited positronium sent cooled antiprotons within an electromagnetic trap. resulting Rydberg antihydrogen then horizontally accelerated by electric field gradient (Stark effect), they pass through moiré deflectometer....