Antihydrogen formation in collisions of positronium with antiprotons

Details Antihydrogen formation in collisions of positronium with antiprotons Antihydrogen formation in collisions of positronium with antiprotons

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990nascp3058..223h&link_type=abstract

In NASA, Goddard Space Flight Center, Annihilation in Gases and Galaxies, NASA CP-3058 p 223-228 (SEE N90-18957 11-70)

Physics

Antiprotons, Hydrogen Production, Pair Production, Particle Collisions, Positronium, Antimatter, Charge Exchange, Conjugation, Gravitational Effects, Invariance, Matter (Physics), Positrons, Scattering Cross Sections

Scientific paper

Antihydrogen, consisting of a positron orbiting around an antiproton, is the simplest few body system consisting entirely of antimatter and as such is of considerable importance in providing additional tests of the validity of charge conjugation invariance. In addition, the nature of the gravitational interaction between matter and antimatter might more readily be investigated for an electrically neutral system than one which is charged. Before such studies can be undertaken the antihydrogen must, of course, be produced by attachment of a positron to an antipositron. Several production mechanisms have been proposed, the two most favored of which are radiative capture (spontaneous or stimulated) and charge exchange in positronium-antiproton collisions. The cross section for radiative capture is very much less than that for charge exchange, so that it might be thought that the latter process is greatly to be preferred. Various calculations of the cross section for the charge exchange process are briefly reviewed.

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