Development of a high-efficiency pulsed slow positron beam for measurements with orthopositronium in vacuum

Albérola, N.; Anthonioz, T.; Badertscher, A.; Bas, Corine; Белов, А. С.; Crivelli, P.; Gninenko, S.; Голубев, Н.; Kirsanov, M.; Rubbia, A.; Sillou, D.

doi:10.1016/j.nima.2006.01.025

Cited by 19 publications

(21 citation statements)

References 30 publications

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“…In improved experiments using continuous-wave lasers, the transition frequency was measured with a precision of 2.6 ppb, sufficient to provide a test for o(α 4 ) QED corrections [7]. To verify calculations to higher order, further experiments based on advanced Ps synthesis starting from a continuous positron beam transported towards a silica converter [8], and using an enhanced laser excitation system, have been developed: new accurate determinations of the 1 3 …”

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confidence: 99%

Producing long-lived 23S positronium via 33P laser excitation in magnetic and electric

Aghion¹,

Amsler²,

Antonello³

et al. 2018

Phys. Rev. A

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Producing positronium (Ps) in the metastable 2 3 S state is of interest for various applications in fundamental physics. We report here on an experiment in which Ps atoms are produced in this long-lived state by spontaneous radiative decay of Ps excited to the 3 3 P level manifold. The Ps cloud excitation is obtained with a UV laser pulse in an experimental vacuum chamber in presence of guiding magnetic field of 25 mT and an average electric field of 300 V cm −1 . The evidence of the 2 3 S state production is obtained to the 3.6σ level of statistical significance using a novel analysis technique of the single-shot positronium annihilation lifetime spectra. The dynamic of the Ps population on the involved levels has been studied with a rate equation model.

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confidence: 99%

Producing long-lived 23S positronium via 33P laser excitation in magnetic and electric

Aghion¹,

Amsler²,

Antonello³

et al. 2018

Phys. Rev. A

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“…The H-H distance is the distance from the closest H atoms on opposite sides of the framework having subtracted the van der Waals radii (2 × 1.2Å). For this study we used the ETHZ slow e + beam [20,21]. The slow positrons from the beam are accelerated to 1-20 keV towards the MOF target.…”

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confidence: 99%

Positronium emission spectra from self-assembled metal-organic frameworks

et al. 2014

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Recently, evidence for positronium (Ps) in a Bloch state in self-assembled metal-organic frameworks (MOFs) has been reported [Dutta et al., Phys. Rev. Lett. 110, 197403 (2013)]. In this paper, we study Ps emission into vacuum from four different MOF crystals: MOF-5, IRMOF-8, ZnO4(FMA)3 and IRMOF-20. Our measurements of Ps yield and emission energy into vacuum provide definitive evidence of Ps delocalization. We determine with a different technique Ps diffusion lengths in agreement with the recently published results. Furthermore, we measure that a fraction of the Ps is emitted into vacuum with a distinctly smaller energy than what one would expect for Ps localized in the MOFs' cells. We show that a calculation assuming Ps delocalized in a Kronig-Penney potential reproduces the measured Ps emission energy.

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“…This, in turn, could enable the development of new techniques for positron annihilation lifetime spectroscopic ͑PALS͒ studies of materials. [16][17][18][19][20][21][22][23] Another important application of tailored positron sources is the creation of cold antihydrogen atoms, 24,25 one goal of which is to test fundamental theories of nature ͑e.g., the CPT theorem which requires the invariance of field theories under charge conjugation, parity inversion and time reversal͒. As discussed at the end of this paper, beams with small transverse spatial extent and small total energy spread could potentially enable new scenarios to create these cold antiatoms.…”

Section: Introductionmentioning

confidence: 99%

Energy spectra of tailored particle beams from trapped single-component plasmas

2009

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Erratum: "Energy spectra of tailored particle beams from trapped single-component plasmas" [Phys. Plasmas16, 057105 (2009)] Phys. Plasmas 17, 049904 (2010);A nondestructive technique was developed recently to create beams of electrons ͑or positrons͒ with small transverse spatial extent and high brightness from single-component plasmas confined in a Penning-Malmberg trap ͓T. R. Weber et al., Phys. Plasmas 90, 123502 ͑2008͔͒. A model for beam extraction was developed that successfully predicts the resulting beam profiles. This model is used here to predict the beam amplitudes and the energy distribution of the beams as a function of the exit-gate voltage. The resulting expressions, suitably scaled by the plasma parameters, depend only on the exit-gate voltage and the electrode radius. Predictions of the theory are confirmed using electron plasmas. This technique permits the formation of beams with both small transverse spatial extent and small energy spread. Applications involving antimatter beams ͑e.g., positrons͒ are discussed, including bright beams for improved spatial resolution, short pulses for time-resolved studies, and cold beams for improved energy resolution.

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Development of a high-efficiency pulsed slow positron beam for measurements with orthopositronium in vacuum

Cited by 19 publications

References 30 publications

Producing long-lived 23S positronium via 33P laser excitation in magnetic and electric

Producing long-lived 23S positronium via 33P laser excitation in magnetic and electric

Positronium emission spectra from self-assembled metal-organic frameworks

Energy spectra of tailored particle beams from trapped single-component plasmas

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