C. Regenfus
A5103501822- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- High-Energy Particle Collisions Research
- Atomic and Molecular Physics
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Muon and positron interactions and applications
- CCD and CMOS Imaging Sensors
- Particle accelerators and beam dynamics
- Cosmology and Gravitation Theories
- Cold Atom Physics and Bose-Einstein Condensates
- Astrophysics and Cosmic Phenomena
- Nuclear physics research studies
- Quantum, superfluid, helium dynamics
- Neutrino Physics Research
- Advanced Chemical Physics Studies
- Scientific Research and Discoveries
- Quantum Mechanics and Applications
- Nuclear Physics and Applications
- Radiation Therapy and Dosimetry
- Relativity and Gravitational Theory
- Quantum and Classical Electrodynamics
- Particle Accelerators and Free-Electron Lasers
ETH Zurich
2014-2024
University of Zurich
2005-2014
European Organization for Nuclear Research
2007-2014
Institute of High Energy Physics
2010-2011
Istituto Nazionale di Fisica Nucleare, Sezione di Genova
2007
The University of Tokyo
2006
Ludwig-Maximilians-Universität München
1995-1999
University of California, Berkeley
1996-1999
The AEGIS experiment, currently being set up at the Antiproton Decelerator CERN, has objective of studying free fall antimatter in Earth's gravitational field by means a pulsed cold atomic beam antihydrogen atoms. Both duration and vertical displacement horizontally emitted atoms will be measured, allowing first test WEP with antimatter.
Abstract The precise measurement of forces is one way to obtain deep insight into the fundamental interactions present in nature. In context neutral antimatter, gravitational interaction high interest, potentially revealing new that violate weak equivalence principle. Here we report on a successful extension tool from atom optics—the moiré deflectometer—for acceleration slow antiprotons. setup consists two identical transmission gratings and spatially resolving emulsion detector for...
Production of antihydrogen atoms by mixing antiprotons with a cold, confined, positron plasma depends critically on parameters such as the density and temperature. We discuss nondestructive measurements, based novel, real-time analysis excited, low-order modes, that provide comprehensive characterization in ATHENA apparatus. The length, radius, density, total particle number are obtained. Measurement control temperature variations, application to production experiments discussed.
Antihydrogen is formed when antiprotons are mixed with cold positrons in a nested Penning trap. We present experimental evidence, obtained using our antihydrogen annihilation detector, that the spatial distribution of emerging atoms independent positron temperature and axially enhanced. This indicates before thermal equilibrium plasma. result has important implications for trapping spectroscopy antihydrogen.
In June 2012, an Expression of Interest for a long-baseline experiment (LBNO) has been submitted to the CERN SPSC. LBNO considers three types neutrino detector technologies: double-phase liquid argon (LAr) TPC and magnetised iron as far detectors. For near detector, high-pressure gas embedded in calorimeter magnet is baseline design. A mandatory milestone concrete prototyping effort towards envisioned large-scale detectors, accompanying campaign measurements aimed at assessing associated...
The Argon Dark Matter (ArDM) experiment consists of a liquid argon (LAr) time projection chamber (TPC) sensitive to nuclear recoils resulting from scattering hypothetical Weakly Interacting Massive Particles (WIMPs) on targets. With an active target 850 kg, ArDM represents important milestone in the quest for with LAr. We present experimental apparatus currently installed underground at Laboratorio Subterraneo de Canfranc (LSC), Spain. show first data recorded during single-phase...
We show that antihydrogen production is the dominant process when mixing antiprotons and positrons in ATHENA apparatus, initial rate exceeds 300 Hz, decaying to 30 Hz within 10 s. A fraction of 65% all observed annihilations due antihydrogen.
We present a measurement and partial wave analysis of the final state K L Ϯ ϯ p ¯p annihilation at rest in liquid hydrogen.This reaction is important for study ¯K decay mode scalar resonances, particular, isovectors 0 (980) (1450).The determination (1450) production also fixes coupling isoscalar f (1500) which discussed as glueball.We find B"p →a (1450);a (1450)→K ¯K…ϭ(8.88Ϯ1.68)ϫ10Ϫ4 hence ¯p→ (1500); (1500)→K ¯K…ϭ(4.52Ϯ0.36)ϫ10 Ϫ4 .The mass width are mϭ1480Ϯ30 MeV/c 2 ⌫ϭ265Ϯ15 ,...
To optimise the design of light readout in ArDM 1-ton liquid argon dark matter detector, a range reflector and WLS coating combinations were investigated several small setups, where scintillation was generated by radioactive sources gas at normal temperature pressure shifted into blue region tetraphenyl butadiene (TPB). Various thicknesses TPB deposited spraying vacuum evaporation onto specular 3M{\small\texttrademark}-foil diffuse Tetratex{\small\textregistered} (TTX) substrates. Light...
The main goal of the AEgIS experiment at CERN is to test weak equivalence principle for antimatter. will measure free-fall an antihydrogen beam traversing a moir\'e deflectometer. determine gravitational acceleration g with initial relative accuracy 1% by using emulsion detector combined silicon micro-strip time flight. Nuclear emulsions can annihilation vertex atoms precision about 1 - 2 microns r.m.s. We present here results detectors operated in vacuum low energy antiprotons from...
Cold antihydrogen atoms were produced by mixing cold samples of antiprotons and positrons. The temperature the positron plasma was increased controlled radio-frequency (RF) heating, production measured. Formation is observed to decrease with but a simple power law scaling not observed. Significant still present at room temperature.
While developing a liquid argon detector for dark matter searches we investigate the influence of air contamination on VUV scintillation yield in gaseous at atmospheric pressure. We determine with radioactive alpha-source photon various partial pressures and different reflectors wavelength shifters. find fast component time constant tau1= 11.3 +- 2.8 ns, independent gas purity. However, decay slow depends purity is good indicator total light yield. This dependence attributed to impurities...
The Argon Dark Matter (ArDM-1t) experiment is a ton-scale liquid argon (LAr) double-phase time projection chamber designed for direct searches. Such device allows to explore the low energy frontier in LAr with charge imaging detector. ionization extracted from into gas phase and there amplified by use of Large Electron Multiplier order reduce detection threshold. Direct fine spatial granularity, combined measurement amplitude evolution associated primary scintillation light, provide powerful...
Abstract We report on the first production of an antihydrogen beam by charge exchange 6.1 keV antiprotons with a cloud positronium in GBAR experiment at CERN. The 100 antiproton delivered AD/ELENA facility was further decelerated pulsed drift tube. A 9 MeV electron from linear accelerator produced low energy positron beam. positrons were accumulated set two Penning–Malmberg traps. target resulted conversion extracted steered onto this to produce antiatoms. observe excess over background...