An energy-tunable positronium beam produced using the photodetachment of the positronium negative ion

Michishio, Koji; Tachibana, Takayuki; Suzuki, Ryôhei; Wada, Ken; Yagishita, Akira; Hyodo, Toshio; Nagashima, Yasuyuki

doi:10.1063/1.4729867

Cited by 37 publications

(29 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This was first suggested by Mills [509], but has only recently been demonstrated following the experimental advances made by the Tokyo group (see Fig. 36) [120,559]. Energy tunable Ps beams can be made by passing a positron beam through a gas cell [85,231,560,561], or by glancing angle positron scattering [562].…”

Section: Ps − Spectroscopymentioning

confidence: 99%

Experimental progress in positronium laser physics

2018

View full text Add to dashboard Cite

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.

show abstract

Section: Ps − Spectroscopymentioning

confidence: 99%

Experimental progress in positronium laser physics

2018

View full text Add to dashboard Cite

show abstract

“…Some of the γ-rays from positron annihilations in the target were detected by the MCP and gave information on the time of the Ps formation. The time interval of the detections of this γ-ray and the Ps clearly showed that the Ps flew with the energy expected from the electrostatic acceleration of the Ps − ions [5]. Production of an energy-tunable Ps beam from 300 eV to 1.9 keV in an ultra-high-vacuum environment was achieved.…”

Section: Ps Negative Ion Experiments Stationmentioning

confidence: 90%

“…Immediately after that, the photodetachment was accomplished by irradiation of 25 Hz pulsed (width 12 ns) Qswitched Nd:YAG laser. Since the slow positron beam is provided in 50 Hz, the data with and After developing the above technique, we built a new beam-line branch, SPF-A3, and an energy-tunable Ps beam was successfully produced in ultra-high-vacuum environment and detected [5]. The energy of the Ps, which is a neutral atom and hence cannot be accelerated by a static electric field directly, tuned accelerating the Ps − ions before the photodetachment.…”

Section: Ps Negative Ion Experiments Stationmentioning

confidence: 99%

New experiment stations at KEK Slow Positron Facility

Wada

Hyodo

Kondo

et al. 2013

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

“…Ionizing potential of this negative Ps ion is 0.33 eV. In the setup described by Michishio et al [20] the monoenergetic beam of positrons bombards the target of tungsten foil covered by a monolayer of Na. The Ps _ ions emitted from this surface (efficiency about 1.5%) are accelerated by a static electric field.…”

Section: Namentioning

confidence: 99%