Beam-foil production of fast positronium

Mills, A. P.; Crane, W. S.

doi:10.1103/physreva.31.593

Cited by 42 publications

(19 citation statements)

References 20 publications

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“…It is also possible to produce Ps in transmission from mesoporous structures applied to very thin (20 nm) substrates, also with approximately 10% efficiency [128,308]. Fast (10-500 eV) Ps can be produced by passing an energetic positron beam through a thin foil of carbon [242], with a few % efficiency.…”

Section: Ps Productionmentioning

confidence: 99%

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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: Ps Productionmentioning

confidence: 99%

“…These experiments used the beam foil production method [242], which involves passing a positron beam through a thin (≈2 nm) carbon foil. This method is not very efficient, converting only 0.028% of the incident positrons into Ps − ions [509].…”

Section: Ps − Spectroscopymentioning

confidence: 99%

Experimental progress in positronium laser physics

2018

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“…This technique has been used for the observation of Ps specular reflection from a LiF surface [26] and the measurement of Ps-gas scattering cross sections in the energy range below 100eV [27]. Formation of Ps beams with a kinetic energy from 10 to 500eV have also been tried by partial transmission of keV-energy positrons through 5nm carbon film [28]. It has been proposed that the production of an energy-tunable monoenergetic Ps beam might be feasible by the photodetachment of Ps − produced using Cs coated carbon film or tungsten surface [2,29,30].…”

Section: Ps − Photodetachmentmentioning

confidence: 99%

Positronium negative ion experiments – formation, photodetachment and production of an energy tunable positronium beam–

Nagashima

Michishio

Tachibana

et al. 2012

J. Phys.: Conf. Ser.

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“…In the case of solids the value of U can be determined by the time of flight (TOF) method [61]. A schematic diagram of an experimental equipment is shown in Fig.…”

Section: The Ore Model and Blob Modelmentioning

confidence: 99%