Polarizability of the pionic helium atom

Korobov, V. I.; Bekbaev, A. K.; Aznabayev, D.; Zhaugasheva, S. A.

doi:10.1088/0953-4075/48/24/245006

Cited by 15 publications

(22 citation statements)

References 21 publications

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“…Metastable pionic helium (π He + ) is a three-body atom [41][42][43] consisting of a helium nucleus, an electron occupying the 1s ground state, and a negative-charged pion in a Rydberg state of quantum numbers n ∼ − 1 ∼ 16. These atoms are heretofore hypothetical, in the sense that their spectral lines have never been directly observed.…”

Section: Other Experiments and Future Perspectivesmentioning

confidence: 99%

Recent progress of laser spectroscopy experiments on antiprotonic helium

Hori¹

2018

Phil. Trans. R. Soc. A.

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The Atomic Spectroscopy and Collisions Using Slow Antiprotons (ASACUSA) collaboration is currently carrying out laser spectroscopy experiments on antiprotonic helium [Formula: see text] atoms at CERN's Antiproton Decelerator facility. Two-photon spectroscopic techniques have been employed to reduce the Doppler width of the measured [Formula: see text] resonance lines, and determine the atomic transition frequencies to a fractional precision of 2.3-5 parts in 10 More recently, single-photon spectroscopy of buffer-gas cooled [Formula: see text] has reached a similar precision. By comparing the results with three-body quantum electrodynamics calculations, the antiproton-to-electron mass ratio was determined as [Formula: see text], which agrees with the known proton-to-electron mass ratio with a precision of 8×10 The high-quality antiproton beam provided by the future Extra Low Energy Antiproton Ring (ELENA) facility should enable further improvements in the experimental precision.This article is part of the Theo Murphy meeting issue 'Antiproton physics in the ELENA era'.

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Section: Other Experiments and Future Perspectivesmentioning

confidence: 99%

Recent progress of laser spectroscopy experiments on antiprotonic helium

Hori¹

2018

Phil. Trans. R. Soc. A.

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“…Metastable pionic helium (πHe + ) is an analogous three-body atom [48][49][50] that consists of a helium nucleus, an electron in the 1s ground state, and a negative-charged pion in a Rydberg state of quantum numbers n ∼ − 1 ∼ 16. The spectral lines of these atoms have never been directly observed, and so the existence of πHe + is so far hypothetical.…”

Section: Conclusion and Future Perspectivesmentioning

confidence: 99%

Single-photon laser spectroscopy of cold antiprotonic helium

Hori

2018

Hyperfine Interact

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Some laser spectroscopy experiments carried out by the Atomic Spectroscopy and Collisions Using Slow Antiprotons (ASACUSA) collaboration to measure the single-photon transition frequencies of antiprotonic helium (pHe + ≡ p +He 2+ +e − ) atoms are reviewed. The pHe + were cooled to temperature T = 1.5-1.7 K by buffer-gas cooling in a cryogenic gas target, thus reducing the thermal Doppler width in the single-photon resonance lines. The antiproton-to-electron mass ratio was determined as M p /m e = 1836.1526734(15) by comparisons with the results of three-body quantum electrodynamics calculations. This agreed with the known proton-to-electron mass ratio. IntroductionMetastable antiprotonic helium (pHe + ≡ p + He 2+ + e − ) is a three-body atom composed of a helium nucleus, an electron in the ground state, and an antiproton occupying a Rydberg state of principal and orbital angular momentum quantum numbers n ∼ − 1 ∼ 38 [1-3]. By measuring its transition frequencies by laser spectroscopy [4][5][6][7], and comparing the values with the results of three-body quantum electrodynamics (QED) calculations, the antiproton-to-electron mass ratio M p /m e can in principle be determined with a relative precision of < 10 −11 . This corresponds to the best determinations of the proton-to-electron mass ratio M p /m e from Penning trap experiments [8][9][10][11][12], or laser spectroscopy of HD + molecular ions [13][14][15]. Spectroscopy of pHe + also provides a consistency test of CPT symmetry, which may be complementary to the experiments on antihydrogen atoms [16][17][18].

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“…Intensive e↵orts are currently underway to achieve this goal. Metastable pionic helium (⇡He + ) is a three-body atom [47][48][49] consisting of a helium nucleus, an electron in the 1s ground state, and a negative-charged pion in a Rydberg state of quantum numbers n ⇠`− 1 ⇠ 16. The spectral lines of these atoms have never been directly observed, and so the existence of ⇡He + is so far hypothetical.…”

Section: Future Perspectivesmentioning

confidence: 99%

Precision laser spectroscopy experiments on antiprotonic helium

Hori

2018

EPJ Web of Conferences

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At CERN‘s Antiproton Decelerator (AD) facility, the Atomic Spectroscopyand Collisions Using Slow Antiprotons (ASACUSA) collaboration is carrying out precise laser spectroscopy experiments on antiprotonic helium (p̅He+ ≡ p̅+He2++e−) atoms. By employing buffer-gas cooling techniquesin a cryogenic gas target, samples of atoms were cooled to temperatureT = 1.5–1.7 K, thereby reducing the Doppler width in the single-photon resonance lines. By comparing the results with three-body quantum electrodynamics calculations, the antiproton-to-electron mass ratio was determined as Mp̅/me = 1836.1526734(15). This agreed with the known proton-to-electron mass ratio with a precision of 8 . 1010. Further improvements in the experimental precision are currently being attempted. The high-quality antiproton beam provided by the future Extra Low Energy Antiproton Ring (ELENA) facility should further increase the experimental precision.

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Polarizability of the pionic helium atom

Cited by 15 publications

References 21 publications

Recent progress of laser spectroscopy experiments on antiprotonic helium

Recent progress of laser spectroscopy experiments on antiprotonic helium

Single-photon laser spectroscopy of cold antiprotonic helium

Precision laser spectroscopy experiments on antiprotonic helium

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