Electron-Like Scattering of Positronium

Brawley, S. J.; Armitage, S.; Beale, J.; Leslie, D.; Williams, AE; Laricchia, G.

doi:10.1126/science.1192322

Cited by 106 publications

(118 citation statements)

References 10 publications

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“…A similar effect has already been observed in total scattering measurements between ground state Ps atoms with various atomic and molecular targets [640,641]. In some of these experiments Ps beam energies comparable to or higher than the Ps binding energy (6.8 eV) are used, allowing the interactions to be reasonably well characterized by the impulse approximation [642,643].…”

Section: Scatteringmentioning

confidence: 57%

Experimental progress in positronium laser physics

2018

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Abstract. The field of experimental positronium physics has advanced significantly in the last few decades, with new areas of research driven by the development of techniques for trapping and manipulating positrons using Surko-type buffer gas traps. Large numbers of positrons (typically ≥10 6 ) accumulated in such a device may be ejected all at once, so as to generate an intense pulse. Standard bunching techniques can produce pulses with ns (mm) temporal (spatial) beam profiles. These pulses can be converted into a dilute Ps gas in vacuum with densities on the order of 10 7 cm −3 which can be probed by standard ns pulsed laser systems. This allows for the efficient production of excited Ps states, including long-lived Rydberg states, which in turn facilitates numerous experimental programs, such as precision optical and microwave spectroscopy of Ps, the application of Stark deceleration methods to guide, decelerate and focus Rydberg Ps beams, and studies of the interactions of such beams with other atomic and molecular species. These methods are also applicable to antihydrogen production and spectroscopic studies of energy levels and resonances in positronium ions and molecules. A summary of recent progress in this area will be given, with the objective of providing an overview of the field as it currently exists, and a brief discussion of some future directions.

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Section: Scatteringmentioning

confidence: 57%

Experimental progress in positronium laser physics

2018

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“…RTE is analogous to the dielectronic recombination (DR) occurring in electron-atom collisions (the inverse process of the Auger decay); that is why the quasifree electron model is well suited for its description. As a further example, we mention the recent experimental investigations of the scattering of positronium (Ps) on atoms [8,9]. The obtained results suggest that the electron constituent of Ps plays the dominant role in the collision, and it interacts with the target as a quasifree particle: The measured total cross sections revealed an unexpected, strong similarity with those for equivelocity electron projectiles.…”

Section: Introductionmentioning

confidence: 70%

Multiple ionization of rare gases by hydrogen-atom impact

et al. 2013

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Cross sections for the multiple ionization of He, Ne, Ar, and Kr by H 0 impact with and without the simultaneous ionization (electron loss) of the projectile are presented in the energy range 75-300 keV. The data were measured by coincident detection of the recoil target ions and the charge-state analyzed scattered projectiles. To obtain information about the role played by the electron of H 0 in the collision, the measurements were repeated with protons under the same experimental conditions. The measured data are analyzed using the classical trajectory Monte Carlo (CTMC) method. CTMC describes well the experimental data for both projectiles for single vacancy creation; however, increasing deviation is observed between theory and experiment with increasing number of created vacancies and with decreasing target atomic number.

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“…Both experiments [93] and calculations [94] show that ground state Ps atoms scatter from atoms and molecules with total cross sections similar to those of equivelocity electrons. The upper limit for the Rydberg Ps ionization cross section is set by the sum of the equivelocity electron and positron total scattering cross sections, and drops off rapidly close to threshold, as shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

Formation of positron-atom bound states in collisions between Rydberg Ps and neutral atoms

Swann¹,

Cassidy

Deller

et al. 2016

Phys. Rev. A

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Predicted twenty years ago, positron binding to neutral atoms has not yet been observed experimentally. A new scheme is proposed to detect positron-atom bound states by colliding Rydberg positronium (Ps) with neutral atoms. Estimates of the charge-transfer reaction cross section are obtained using the first Born approximation for a selection of neutral atom targets and a wide range of incident Ps energies and principal quantum numbers. We also estimate the corresponding Ps ionization cross section. The accuracy of the calculations is tested by comparison with earlier predictions for Ps charge transfer in collisions with hydrogen and antihydrogen. We describe an existing Rydberg Ps beam suitable for producing positron-atom bound states and estimate signal rates based on the calculated cross sections and realistic experimental parameters. We conclude that the proposed methodology is capable of producing such states and of testing theoretical predictions of their binding energies.

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Electron-Like Scattering of Positronium

Cited by 106 publications

References 10 publications

Experimental progress in positronium laser physics

Experimental progress in positronium laser physics

Multiple ionization of rare gases by hydrogen-atom impact

Formation of positron-atom bound states in collisions between Rydberg Ps and neutral atoms

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