Shift and broadening of resonance lines of antiprotonic helium atoms in solid helium

Adamczak, A.; Bakalov, D.

doi:10.1103/physreva.90.054501

Cited by 4 publications

(3 citation statements)

References 16 publications

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“…Stark mixing during collisions with other helium atoms does not easily occur because the antiprotonic states having the same n-value are far from degenerate in this threebody system. The 1s electron protects the antiproton during collisions with other helium atoms in the target [21,22]. The metastablepHe + preferentially deexcites by undergoing slow radiative transitions of the type n = = −1 with lifetimes of τ = 1-2 µs.…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%

Recent progress of laser spectroscopy experiments on antiprotonic helium

Hori¹

2018

Phil. Trans. R. Soc. A.

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“…The atoms can be readily synthesized via the reaction, p + He ! pHe + + e − , by allowing an antiproton beam [23] to come to rest in a helium gas target [24][25][26]. The transition frequencies of pHe + spanning the infrared to ultraviolet range have been calculated [4][5][6] to a relative precision of ⇠ 10 −10 by evaluating the quantum electrodynamics (QED) corrections up to order m e ↵ 7 in atomic units.…”

Section: Introductionmentioning

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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“…The atoms are experimentally synthesized via the reaction, p + He → pHe + + e − , which occurs when an antiproton beam [24] is allowed to come to rest in a helium gas target [25][26][27]. The transition frequencies of pHe + spanning the infrared to ultraviolet regions have been calculated [1][2][3] to a relative precision of ∼ 10 −10 by evaluating the QED corrections up to order m e α 7 in atomic units.…”

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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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Shift and broadening of resonance lines of antiprotonic helium atoms in solid helium

Cited by 4 publications

References 16 publications

Recent progress of laser spectroscopy experiments on antiprotonic helium

Recent progress of laser spectroscopy experiments on antiprotonic helium

Precision laser spectroscopy experiments on antiprotonic helium

Single-photon laser spectroscopy of cold antiprotonic helium

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