Formation of antihydrogen beams from positron-antiproton interactions

The formation of a beam of antihydrogen atoms when antiprotons pass through cold, dense positron plasmas is simulated for various plasma properties and antiproton injection energies. There are marked dependences of the fraction of injected antiprotons which are emitted as antihydrogen in a beam-like...

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Bibliographic Details
Published in:New journal of physics 2019-07, Vol.21 (7), p.73020
Main Authors: Jonsell, S, Charlton, M
Format: Article
Language:English
Subjects:
Antihydrogen
Antiparticles
Antiprotons
beams
Beams (radiation)
Kinetic energy
Matter & antimatter
Physics
plasma
Plasmas (physics)
positron
Positrons
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Summary:The formation of a beam of antihydrogen atoms when antiprotons pass through cold, dense positron plasmas is simulated for various plasma properties and antiproton injection energies. There are marked dependences of the fraction of injected antiprotons which are emitted as antihydrogen in a beam-like configuration upon the temperature of the positrons, and upon the antiproton kinetic energy. Yields as high as 13% are found at the lowest positron temperatures simulated here (5 K) and at antiproton kinetic energies below about 0.1 eV. By 1 eV the best yields are as low as 10−3, falling by about two orders of magnitude with an increase of the positron temperature to 50 K. Example distributions for the antihydrogen angular emission, binding energy and kinetic energy are presented and discussed. Comparison is made with experimental information, where possible.
ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/ab2bdc