Production of antihydrogen

  title={Production of antihydrogen},
  author={Gerhard Baur and Giovanni Boero and Andreas Brauksiepe and A. Buzzo and Wolfgang K. Eyrich and Richard G. Geyer and Dieter Grzonka and J. Hauffe and Kurt Kilian and Marco Lovetere and Mario Macr{\`i} and Martin Moosburger and R. Nellen and Walter Oelert and S. Passaggio and A. Pozzo and K. R{\"o}hrich and Kirsten Sachs and G. Schepers and Th. Sefzick and Reinhard S Simon and R. Eric Stratmann and F. Stinzing and Magnus Wolke},
  journal={Physics Letters B},
Results are presented for a measurement for the production of the antihydrogen atom H0 ≡ pe+, the simplest atomic bound state of antimatter. A method has been used by the PS210 collaboration at LEAR which assumes that the production of H0 is predominantly mediated by the e+e−-pair creation via the two-photon mechanism in the antiproton-nucleus interaction. Neutral H0 atoms are identified by a unique sequence of characteristics. In principle H0 is well suited for investigations of fundamental… Expand
Production of antihydrogen in relativistic collisions
The production of antihydrogen atoms H0 ≡ pe+ has been observed by the PS210 collaboration at LEAR. The method assumes an e+e- -pair creation via the two-photon mechanism in the antiproton-nucleusExpand
The ATHENA experiment for the study of antihydrogen
In 2002, the ATHENA experiment was the first to produce large amounts of antihydrogen atoms at the CERN Antiproton Decelerator (AD). In this review article, we collect and discuss all the relevantExpand
Antihydrogen for precision tests in physics
The creation of atoms of antihydrogen under controlled conditions has opened up a new era in physics with antimatter. We describe the experimental realisation of low energy antihydrogen, via theExpand
Production and detection of cold antihydrogen atoms
This work demonstrates the production of antihydrogen atoms at very low energy by mixing trapped antiprotons and positrons in a cryogenic environment and detects the neutral anti-atoms directly when they escape the trap and annihilate, producing a characteristic signature in an imaging particle detector. Expand
Effects of collisions on antiprotonic atoms
Abstract A brief review is given of three experiments at the Antiproton Decelerator at CERN to test CPT invariance which states that particles and antiparticles have identical properties, inExpand
Physics with antihydrogen
Performing measurements of the properties of antihydrogen, the bound state of an antiproton and a positron, and comparing the results with those for ordinary hydrogen, has long been seen as a routeExpand
Relativistic antihydrogen production by pair production with positron capture
Abstract Antihydrogen atoms may rarely be produced by the collision of antiprotons with ions. At relativistic velocities, the antiproton may pass around the Coulomb field of the nucleus and theExpand
Observation of Cold Antihydrogen
The simplest electrical neutral system made entirely of antimatter is the antihydrogen atom ( H ¯ 0 ) consisting of a positron (e+) orbiting an antiproton ( p ¯ ). The first H ¯ 0 atoms produced in pExpand
Antihydrogen production and precision experiments on trapped cold antihydrogen
ATHENA, one of the three approved experiments at the new facility for low energy antiprotons (AD) at CERN, has the primary goal to test CPT invariance by comparing the atomic energy levels ofExpand
Theoretical studies of antihydrogen formation in collisions between positronium atoms and antiprotons
The current state of the theoretical methods that are used in calculations of cross sections for the production of antihydrogen in collisions between antiprotons and positronium atoms is reviewed. AExpand


Production of relativistic antihydrogen atoms by pair production with positron capture and measurement of the Lamb shift
AbstractA beam of relativistic antihydrogen atoms — the bound state ( $$\bar p$$ e+) — can be created by circulating the beam of an antiproton storage ring through an internal gas target. AnExpand
Thousandfold improvement in the measured antiproton mass.
Comparisons of antiproton and proton cyclotron frequencies yield the ratio of inertial masses M(p)/M(p), which is 1000 times more accurate than previous measurements of this ratio using exotic atoms and is the most precise test of CPT invariance with baryons. Expand
Production of relativistic antihydrogen atoms by pair production with positron capture.
A simple method for detecting relativistic antiHydrogen is proposed and method outlined of measuring the antihydrogen Lamb shift to 1% is proposed. Expand
Photon-photon and bremsstrahlung production of fast antihydrogen in p-nucleus collisions
Abstract Antihydrogen is produced in high-energy p - nucleus collisions by e + e − pair production with e + -capture. The cross-section for this process is calculated for the photon-photon andExpand
Charge transfer from the negative-energy continuum: Alternative mechanism for pair production in relativistic atomic collisions.
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As an alternative mechanism for bound-free electron-positron pair production, the transfer of a negative-energy electron in the Coulomb field of one of the collision partners to a bound state of theExpand
A summation-free β+-endpoint spectrometer
Abstract A β + -endpoint spectrometer is described, where positrons are observed in an 11 mm thick silicon detector in coincidence with subsequent γ-rays measured in a germanium detector, and whereExpand
A three layer circular scintillator hodoscope
Abstract The rotationally symmetric kinematics of hadronic reactions around the beam direction call for a detector system with an appropriate symmetry. A hodoscope has been invented which optimallyExpand
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