Antiprotonic helium and kaonic helium – A tale of two exotic helium atomsThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at University of Windsor, Windsor, Ontario, Canada on 21–26 July 2008.

2009 ◽  
Vol 87 (7) ◽  
pp. 835-842 ◽  
Author(s):  
R. S. Hayano
Keyword(s):  
Laser Spectroscopy ◽  
Recent Progress ◽  
Historical Background ◽  
Antiprotonic Helium ◽  
Past Study ◽  
Future Prospects ◽  
Atomic Systems ◽  
X Ray ◽  
Helium Atoms ◽  
International Conference

Recent progress on the precision laser spectroscopy of antiprotonic helium atoms, as well as on the X-ray spectroscopy of kaonic helium atoms, are presented. These two may appear to be unrelated topics (except that both involve exotic helium atoms), but in fact a past study of kaonic helium system led to the serendipitous discovery of antiprotonic helium. Some historical background connecting these two exotic helium atoms, as well as future prospects, are discussed.

EXOTIC HELIUM ATOMS

2010 ◽  
Vol 19 (12) ◽  
pp. 2586-2593
Author(s):  
R. S. Hayano
Keyword(s):  
Laser Spectroscopy ◽  
Recent Progress ◽  
Historical Background ◽  
Antiprotonic Helium ◽  
Past Study ◽  
Future Prospects ◽  
X Ray ◽  
Helium Atoms

Recent progress on the precision laser spectroscopy of antiprotonic helium atoms, as well as on the x-ray spectroscopy of kaonic helium atoms are presented. These two may appear to be unrelated topics (except for the fact that both being exotic helium atoms), but in fact a past study of kaonic helium system led to the serendipitous discovery of antiprotonic helium. Some historical background connecting these two exotic helium atoms, as well as future prospects are discussed.

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.

scholarly journals Near-infrared laser spectroscopy of antiprotonic helium atoms

2014 ◽  
Vol 66 ◽  
pp. 05010
Author(s):  
T. Kobayashi ◽  
D. Barna ◽  
R. S. Hayano ◽  
Y. Murakami ◽  
K. Todoroki ◽  
...  
Keyword(s):  
Laser Spectroscopy ◽  
Near Infrared ◽  
Infrared Laser ◽  
Antiprotonic Helium ◽  
Helium Atoms ◽  
Infrared Laser Spectroscopy

Laser spectroscopy of antiprotonic helium atoms and ions

2005 ◽  
Vol 83 (4) ◽  
pp. 357-361 ◽  
Author(s):  
R S Hayano
Keyword(s):  
Laser Spectroscopy ◽  
Antiprotonic Helium ◽  
Helium Nucleus ◽  
Low Density ◽  
Body System ◽  
Helium Atoms ◽  
Gas Target ◽  
Helium Gas ◽  
Three Body

Laser spectroscopy of an antiprotonic helium ([Formula: see text]He+) atom, a neutral three-body Coulomb system consisting of an antiproton, a helium nucleus, and an electron has so far contributed to the determination of antiproton mass and charge to a precision of 10-8. Recently, we have succeeded in producing long-lived (τ [Formula: see text] 100 ns) antiprotonic helium ions (two-body system: [Formula: see text]He++). This was done by stopping ∼50 keV antiprotons decelerated by using an "inverse linac" (RFQD) in a very low-density helium gas target and selectively populating the ionic level by using laser tagging. It may be possible to use this two-body ion for future high-precision work.PACS Nos.: 36.10.–k, 34.90.+q, 25.43.+t

scholarly journals Towards a first observation of magneto-electric directional anisotropy and linear birefringence in gasesThis 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. 159-164 ◽  
Author(s):  
C. Robilliard ◽  
G. Bailly
Keyword(s):  
Recent Progress ◽  
Ring Cavity ◽  
Measurement Procedure ◽  
Linear Birefringence ◽  
Atomic Systems ◽  
International Conference ◽  
Set Up ◽  
Electric Effects ◽  
High Finesse ◽  
Frequency Metrology

In this contribution to PSAS 2010, we report on recent progress on an experiment aimed at measuring small optical directional anisotropies by frequency metrology in a high-finesse ring cavity. We focus on our first experimental goal, the measurement of magneto-electric effects in gases. After a review of the expected effects in our set-up, we present the apparatus and the measurement procedure, showing that we already have the necessary sensitivity to start novel experiments.

scholarly journals Antiproton–to–electron mass ratio determined by two-photon laser spectroscopy of antiprotonic helium atoms

2014 ◽  
Vol 66 ◽  
pp. 05020
Author(s):  
A. Sótér ◽  
M. Hori ◽  
D. Barna ◽  
R. Hayano ◽  
A. Dax ◽  
...  
Keyword(s):  
Laser Spectroscopy ◽  
Antiprotonic Helium ◽  
Electron Mass ◽  
Mass Ratio ◽  
Helium Atoms ◽  
Two Photon
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