Buffer-gas cooling of antiprotonic helium to 1.5 to 1.7 K, and antiproton-to-electron mass ratio

Science ◽  
2016 ◽  
Vol 354 (6312) ◽  
pp. 610-614 ◽  
Author(s):  
M. Hori ◽  
H. Aghai-Khozani ◽  
A. Soter ◽  
D. Barna ◽  
A. Dax ◽  
...  
Keyword(s):  
Antiprotonic Helium ◽  
Electron Mass ◽  
Buffer Gas ◽  
Mass Ratio ◽  
Buffer Gas Cooling ◽  
Gas Cooling

scholarly journals Precision laser spectroscopy experiments on antiprotonic helium

2018 ◽  
Vol 181 ◽  
pp. 01001
Author(s):  
Masaki Hori
Keyword(s):  
Laser Spectroscopy ◽  
Quantum Electrodynamics ◽  
Single Photon ◽  
Antiprotonic Helium ◽  
Doppler Width ◽  
Electron Mass ◽  
Buffer Gas ◽  
Mass Ratio ◽  
Buffer Gas Cooling ◽  
Three Body

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.

scholarly journals Recent progress of laser spectroscopy experiments on antiprotonic helium

2018 ◽  
Vol 376 (2116) ◽  
pp. 20170270 ◽  
Author(s):  
Masaki Hori
Keyword(s):  
Laser Spectroscopy ◽  
Quantum Electrodynamics ◽  
Single Photon ◽  
Atomic Spectroscopy ◽  
Antiprotonic Helium ◽  
Doppler Width ◽  
Electron Mass ◽  
Spectroscopic Techniques ◽  
Buffer Gas ◽  
Mass Ratio

The Atomic Spectroscopy and Collisions Using Slow Antiprotons (ASACUSA) collaboration is currently carrying out laser spectroscopy experiments on antiprotonic helium atoms at CERN’s Antiproton Decelerator facility. Two-photon spectroscopic techniques have been employed to reduce the Doppler width of the measured resonance lines, and determine the atomic transition frequencies to a fractional precision of 2.3–5 parts in 10 9 . More recently, single-photon spectroscopy of buffer-gas cooled has reached a similar precision. By comparing the results with three-body quantum electrodynamics calculations, the antiproton-to-electron mass ratio was determined as , which agrees with the known proton-to-electron mass ratio with a precision of 8×10 −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’.

scholarly journals Buffer-Gas Cooling of a Single Ion in a Multipole Radio Frequency Trap Beyond the Critical Mass Ratio

2016 ◽  
Vol 116 (23) ◽  
Author(s):  
Bastian Höltkemeier ◽  
Pascal Weckesser ◽  
Henry López-Carrera ◽  
Matthias Weidemüller
Keyword(s):  
Radio Frequency ◽  
Critical Mass ◽  
Buffer Gas ◽  
Mass Ratio ◽  
Buffer Gas Cooling ◽  
Gas Cooling

scholarly journals Realization of coherent optically dense media via buffer-gas cooling

2009 ◽  
Vol 79 (1) ◽  
Author(s):  
Tao Hong ◽  
Alexey V. Gorshkov ◽  
David Patterson ◽  
Alexander S. Zibrov ◽  
John M. Doyle ◽  
...  
Keyword(s):  
Buffer Gas ◽  
Buffer Gas Cooling ◽  
Dense Media ◽  
Gas Cooling

A slow, continuous beam of cold benzonitrile

2015 ◽  
Vol 17 (7) ◽  
pp. 5372-5375 ◽  
Author(s):  
David Patterson ◽  
John M. Doyle
Keyword(s):  
Buffer Gas ◽  
High Flux ◽  
Continuous Beam ◽  
Buffer Gas Cooling ◽  
Gas Cooling

A cold, continuous, high flux beam of benzonitrile has been created via buffer gas cooling.

scholarly journals Two-photon laser spectroscopy of antiprotonic helium and the antiproton-electron mass ratio

2013 ◽  
Author(s):  
D. Barna ◽  
M. Hori ◽  
A. Sótér ◽  
A. Dax ◽  
R. Hayano ◽  
...  
Keyword(s):  
Laser Spectroscopy ◽  
Antiprotonic Helium ◽  
Electron Mass ◽  
Mass Ratio ◽  
Two Photon
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