Experimental progress in positronium laser physics

Cassidy, D. B.

doi:10.1140/epjd/e2018-80721-y

Cited by 143 publications

(136 citation statements)

References 794 publications

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“…[112] Ps gas can be produced by the interaction of β + beams with gases or solids. Ps atoms have prompted substantial interest for both fundamental and applied physics.…”

Section: Long-lived Positroniummentioning

confidence: 99%

Metal–Organic Frameworks in Modern Physics: Highlights and Perspectives

et al. 2019

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Owing to the synergistic combination of a hybrid organic–inorganic nature and a chemically active porous structure, metal–organic frameworks have emerged as a new class of crystalline materials. The current trend in the chemical industry is to utilize such crystals as flexible hosting elements for applications as diverse as gas and energy storage, filtration, catalysis, and sensing. From the physical point of view, metal–organic frameworks are considered molecular crystals with hierarchical structures providing the structure‐related physical properties crucial for future applications of energy transfer, data processing and storage, high‐energy physics, and light manipulation. Here, the perspectives of metal–organic frameworks as a new family of functional materials in modern physics are discussed: from porous metals and superconductors, topological insulators, and classical and quantum memory elements, to optical superstructures, materials for particle physics, and even molecular scale mechanical metamaterials. Based on complementary properties of crystallinity, softness, organic–inorganic nature, and complex hierarchy, a description of how such artificial materials have extended their impact on applied physics to become the mainstream in material science is offered.

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“…[112] Ps gas can be produced by the interaction of β + beams with gases or solids. Ps atoms have prompted substantial interest for both fundamental and applied physics.…”

Section: Long-lived Positroniummentioning

confidence: 99%

Metal–Organic Frameworks in Modern Physics: Highlights and Perspectives

et al. 2019

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“…Positron Annihilation Lifetime Spectroscopy (PALS) is one of the most recognised tool for micro-structure investigation and its applications [1,2]. This spectroscopy technique has been a foundation in identifying the longlived radiative processes from the short-lived components in the decay of positronium atoms [3].…”

Section: Introductionmentioning

confidence: 99%

Towards Time Reversal Symmetry Test with o-Ps Decays Using the J-PET Detector

Raj

Dilski²,

Czerwiński³

2020

Acta Phys. Pol. B

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One of the features of the triplet state of positronium (ortho-Positronium) atoms is its relatively longer lifetime when compared to the singlet states of positronium (para-Positronium) atoms. The most probable decay of ortho-Positronium is into three annihilation photons. In order to test the discrete symmetry using the time-reversal symmetry odd-operator, it is important to identify ortho-Positronium decay. Identification of the decay of ortho-Positronium atoms by measuring the positronium annihilation lifetime with the Jagiellonian-Positron Emission Tomograph (J-PET) is presented in this article.

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“…The present velocity selection technique could allow to produce an almost monochromatic beam of ∼ 1 · 10 3 2 3 S atoms with a velocity spread < 10 4 m s −1 and an angular divergence of ∼ 50 mrad. Positronium (Ps) is one of the few matter/antimatter systems (with antihydrogen and muonium) being considered for probing experimentally the gravitational interac-tion [1][2][3][4][5]. Several experimental schemes based on longlived Ps beams have been proposed, either letting the atoms free-fall in a drift tube [6,7] or by using a matter-arXiv:1808.01808v2 [physics.atom-ph] 18 Apr 2019 wave atom interferometer [8] to measure their vertical displacement with a position-sensitive detector.…”

mentioning

confidence: 99%

Velocity-selected production of 2S3 metastable positronium

Amsler¹,

Antonello²,

Belov³

et al. 2019

Phys. Rev. A

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Positronium in the 2 3 S metastable state exhibits a low electrical polarizability and a long lifetime (1140 ns) making it a promising candidate for interferometry experiments with a neutral matterantimatter system. In the present work, 2 3 S positronium is produced -in absence of electric field -via spontaneous radiative decay from the 3 3 P level populated with a 205 nm UV laser pulse. Thanks to the short temporal length of the pulse, 1.5 ns full-width at half maximum, different velocity populations of a positronium cloud emitted from a nanochannelled positron/positronium converter were selected by delaying the excitation pulse with respect to the production instant. 2 3 S positronium atoms with velocity tuned between 7 · 10 4 m s −1 and 10 · 10 4 m s −1 were thus produced. Depending on the selected velocity, a 2 3 S production efficiency ranging from ∼ 0.8% to ∼ 1.7%, with respect to the total amount of emitted positronium, was obtained. The observed results give a branching ratio for the 3 3 P-2 3 S spontaneous decay of (9.7 ± 2.7)%. The present velocity selection technique could allow to produce an almost monochromatic beam of ∼ 1 · 10 3 2 3 S atoms with a velocity spread < 10 4 m s −1 and an angular divergence of ∼ 50 mrad.

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Experimental progress in positronium laser physics

Cited by 143 publications

References 794 publications

Metal–Organic Frameworks in Modern Physics: Highlights and Perspectives

Metal–Organic Frameworks in Modern Physics: Highlights and Perspectives

Towards Time Reversal Symmetry Test with o-Ps Decays Using the J-PET Detector

Velocity-selected production of 2S3 metastable positronium

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