Antihydrogen Formation via Antiproton Scattering with Excited Positronium

Kadyrov, Alisher; Rawlins, C. M.; Stelbovics, A. T.; Bray, Igor; Charlton, M.

doi:10.1103/physrevlett.114.183201

Cited by 58 publications

(65 citation statements)

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“…Using the two-center convergent close-coupling (CCC) method [2] the cross sections for antihydrogen formation via positronium (Ps) scattering on antiprotons have been calculated at low energies for various initial Ps(nl) states [3,4]. Simple power laws for near-threshold behavior were identified.…”

Section: Introductionmentioning

confidence: 99%

Near-threshold behavior of positronium-antiproton scattering

et al. 2016

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Using the convergent close-coupling theory we study the threshold behavior of cross sections for positronium (Ps) of energy E scattering on antiprotons. In the case of Ps(1s) elastic scattering, simple power laws are observed for all partial waves studied. The partial-wave summed cross section is nearly constant, and dominates the antihydrogen formation cross section at all considered energies, even though the latter is exothermic and behaves as 1/E 1/2 . For Ps(2s), oscillations spanning orders of magnitude on top of the 1/E behavior are found in the elastic and quasielastic cross sections. The antihydrogen formation is influenced by dipole-supported resonances below the threshold of inelastic processes. Resonance energies form a geometric progression relative to the threshold. The exothermic antihydrogen formation cross sections behave as 1/E at low energies, but are oscillation free. We demonstrate that all these rich features are reproduced by the threshold theory developed by Gailitis [J. Phys. B: At. Mol. Phys. 15, 3423 (1982)].

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Section: Introductionmentioning

confidence: 99%

Near-threshold behavior of positronium-antiproton scattering

et al. 2016

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“…This is especially so given the recent experimental advances in producing excited states of Ps (see, e.g., [45][46][47][48]). Production ofH in selected states is possible, by picking out the appropriate Ps state [49], and guidance on possible production rates using some excited states of Ps is now feasible with the availability of reliable theory [50,51].…”

Section: Discussion and Prospectsmentioning

confidence: 99%

Closing in on the properties of antihydrogen

Charlton

2017

Eur. Phys. J. D

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Abstract. Recent achievements leading, amongst other things, to the observation of the two-photon 1S-2S transition in antihydrogen are reviewed. We summarise some of the technical advances that were necessary to facilitate this, and how these addressed the requirements posed by the underlying physical processes. Aspects of the latter have been elucidated by simulations aimed at describing as closely as possible the experimental situations, and we describe some recent insights from that work. We will close with a look to the future.

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“…In addition to production by directly mixing positrons and antiprotons [26][27][28], antihydrogen has also been produced in a double Rydberg charge exchange scheme that involved the creation and interaction of Ps [29] with recent improvements in Ps yield [30]. Recent, high quality, calculations for Ps-p charge exchange [31,32] for initial Ps states from =n 1 3…”

Section: Charge Exchange Reactions With Excited State Positroniummentioning

confidence: 99%

Cold neutral atoms via charge exchange from excited state positronium: a proposal

2017

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We present a method for generating cold neutral atoms via charge exchange reactions between trapped ions and Rydberg positronium. The high charge exchange reaction cross section leads to efficient neutralisation of the ions and since the positronium-ion mass ratio is small, the neutrals do not gain appreciable kinetic energy in the process. When the original ions are cold the reaction produces neutrals that can be trapped or further manipulated with electromagnetic fields. Because a wide range of species can be targeted we envisage that our scheme may enable experiments at low temperature that have been hitherto intractable due to a lack of cooling methods. We present an estimate for achievable temperatures, neutral number and density in an experiment where the neutrals are formed at a milli-Kelvin temperature from either directly or sympathetically cooled ions confined on an ion chip. The neutrals may then be confined by their magnetic moment in a co-located magnetic minimum well also formed on the chip. We discuss general experimental requirements.

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Antihydrogen Formation via Antiproton Scattering with Excited Positronium

Cited by 58 publications

References 50 publications

Near-threshold behavior of positronium-antiproton scattering

Near-threshold behavior of positronium-antiproton scattering

Closing in on the properties of antihydrogen

Cold neutral atoms via charge exchange from excited state positronium: a proposal

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