Advances in Antihydrogen Physics

  title={Advances in Antihydrogen Physics},
  author={Mike Charlton and D.P. van der Werf},
  journal={Science Progress},
  pages={34 - 62}
The creation of cold antihydrogen atoms by the controlled combination of positrons and antiprotons has opened up a new window on fundamental physics. More recently, techniques have been developed that allow some antihydrogen atoms to be created at low enough kinetic energies that they can be held inside magnetic minimum neutral atom traps. With confinement times of many minutes possible, it has become feasible to perform experiments to probe the properties of the antiatom for the first time. We… 
7 Citations

Special issue on antihydrogen and positronium

Department of Physics, College of Science, Swansea University, Singleton Park, Swansea SA2 8PP, United Kingdom Department of Physics and Astronomy, University of California Riverside, Riverside, CA

Low-energy l-mixing collisions of excited positronium with protons and antiprotons

We investigate l-mixing processes in collisions of excited positronium (Ps) atoms with protons in the range of the principal quantum number n of the Ps atom between 4 and 8. We show first that

Recent progress in the description of positron scattering from atoms using the convergent close-coupling theory

Much progress in the theory of positron scattering on atoms has been made in the ten years since the review of Surko et al (2005 J. Phys. B: At. Mol. Opt. Phys. 38 R57). We review this progress for


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Convergent close-coupling approach to positron scattering on He+

Abstract A close-coupling method is used to generate electron-loss and total scattering cross sections for the first three partial waves with both a single-centre and two-centre expansion of the

On the formation of trappable antihydrogen

The formation of antihydrogen atoms from antiprotons injected into a positron plasma is simulated, focussing on the fraction that fulfil the conditions necessary for confinement of anti-atoms in a



A source of antihydrogen for in-flight hyperfine spectroscopy

This work reports the development of an antihydrogen source using a cusp trap for in-flight spectroscopy, a major step towards precision spectroscopic of the ground-state hyperfine splitting of antiHydrogen using Rabi-like beam spectroscope.

Atomic processes in antihydrogen experiments: a theoretical and computational perspective

One possible route for a precision test of the CPT theorem is to perform spectroscopic measurements on the antihydrogen atom and compare the results with those from hydrogen. We present a review of

A novel cooling scheme for antiprotons

We propose a novel technique which uses laser-cooled negative osmium ions for sympathetic cooling of antiprotons. Temperatures down to the sub-millikelvin range might be achievable. These antiprotons

Spatial distribution of cold antihydrogen formation.

Experimental evidence is presented that the spatial distribution of the emerging antihydrogen atoms is independent of the positron temperature and axially enhanced, indicating thatAntihydrogen is formed before the antiprotons are in thermal equilibrium with the positrons in a nested Penning trap.

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.