Precision measurement of the decay rate of the negative positronium ion Ps
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Ceeh, Hubert; Hugenschmidt, C.; Schreckenbach, K.; Gärtner, Stefan; Thirolf, P. G.; Fleischer, Frank; Schwalm, D.

doi:10.1103/physreva.84.062508

Cited by 39 publications

(20 citation statements)

References 32 publications

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“…This method is not very efficient, converting only 0.028% of the incident positrons into Ps − ions [509]. The same methodology as developed by Mills was used in further decay rate measurements carried out by researchers at Heidelberg University [540][541][542], who obtained Γ = 2.0875(50) ns −1 , in very good agreement with the calculated value of Γ = 2.087963(12) ns −1 [520]. In all of these experiments a d.c. positron beam was used to produce Ps − ions that are immediately accelerated by a large electric field.…”

Section: Ps − Spectroscopymentioning

confidence: 99%

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 − Spectroscopymentioning

confidence: 99%

Experimental progress in positronium laser physics

2018

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“…It is known that the positron lifetime increases with increasing defect size and eventually saturates toward the lifetime associated with positronium formation near a free surface of 479 ps [39]. The maximum long lifetime acquired from fitting the measured positron lifetime spectra is 294 ps in the case of TTN07, which sets the largest vacancy cluster size investigated in this study.…”

Section: Quantitative Analysis Of Palsmentioning

confidence: 67%

Positron annihilation spectroscopy investigation of vacancy defects in neutron-irradiated3C-SiC

Koyanagi

Katoh

et al. 2017

Phys. Rev. B

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Abstract:Positron annihilation spectroscopy characterization results for neutron-irradiated 3C-SiC are described here, with a specific focus on explaining the size and character of vacancy clusters as a complement to the current understanding of the neutron irradiation response of 3C-SiC. Positron annihilation lifetime spectroscopy was used to capture the irradiation temperature and dose dependence of vacancy defects in 3C-SiC following neutron irradiation from 0.01 to 31 dpa in the temperature range from 380 to 790°C. The neutral and negatively charged vacancy clusters were identified and quantified. The results suggest that the vacancy defects that were measured by positron annihilation spectroscopy technique contribute very little to the transient swelling of SiC. In addition, coincidence Doppler broadening measurement was used to investigate the chemical identity surrounding the positron trapping sites. It was found that silicon vacancy-related defects dominate in the studied materials and the production of the antisite defect C Si may result in an increase in the probability of positron annihilation with silicon core electrons.

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“…Fleischer et al also obtained the upper limit of the Ps − emission energy from the DLC foil to be 0.12 eV, which is lower than the Ps − binding energy. Furthermore, Ceeh et al [117] measured the decay rate employing the high-intensity neutron induced positron source in Munich (NEPOMUC). The primary 1 keV beam of moderated positrons from NEPOMUC (9 × 10 8 e + /s) was remoderated with an efficiency of 5%.…”

Section: Measurements Of the Ps − Decay Ratementioning

confidence: 99%

Experiments on positronium negative ions

Nagashima

2014

Physics Reports

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Precision measurement of the decay rate of the negative positronium ion Ps −

Cited by 39 publications

References 32 publications

Experimental progress in positronium laser physics

Experimental progress in positronium laser physics

Positron annihilation spectroscopy investigation of vacancy defects in neutron-irradiated3C-SiC

Experiments on positronium negative ions

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