Metastable antiprotonic helium atomcules

1996 ◽  
Vol 101-102 (1) ◽  
pp. 451-461 ◽  
Author(s):  
Toshimitsu Yamazaki
Keyword(s):  
Antiprotonic Helium

Density Shift and Broadening of Transition Lines in Antiprotonic Helium

2000 ◽  
Vol 84 (11) ◽  
pp. 2350-2353 ◽  
Author(s):  
Dimitre Bakalov ◽  
Bogumil Jeziorski ◽  
Tatiana Korona ◽  
Krzysztof Szalewicz ◽  
Eugeniya Tchoukova
Keyword(s):  
Antiprotonic Helium ◽  
Density Shift

Progress in precise laser spectroscopy of antiprotonic helium atomsThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at École de Physique, les Houches, France, 30 May – 4 June, 2010.

2011 ◽  
Vol 89 (1) ◽  
pp. 1-5 ◽  
Author(s):  
Masaki Hori
Keyword(s):  
Laser Spectroscopy ◽  
Optical Transition ◽  
Antiprotonic Helium ◽  
Atomic Systems ◽  
International Conference

The ASACUSA collaboration at CERN has previously measured the optical transition frequencies of antiprotonic helium to a precision of <1 part in 108 by laser spectroscopy. We describe some recent theoretical and experimental developmental work carried out by our collaboration to further improve the experimental precision.

mα7-Order Corrections in the Hydrogen Molecular Ions and Antiprotonic Helium

2014 ◽  
Vol 112 (10) ◽  
Author(s):  
Vladimir I. Korobov ◽  
Laurent Hilico ◽  
Jean-Philippe Karr
Keyword(s):  
Molecular Ions ◽  
Antiprotonic Helium

Laser spectroscopy of antiprotonic helium and stringent constraint on the antiproton charge and mass

2000 ◽  
Vol 663-664 ◽  
pp. 955c-958c
Author(s):  
R.S. Hayano ◽  
J. Eades ◽  
T. von Egidy ◽  
F.J. Hartmann ◽  
M. Hori ◽  
...  
Keyword(s):  
Laser Spectroscopy ◽  
Antiprotonic Helium ◽  
Stringent Constraint

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.

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