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Buffer-gas cooling of antiprotonic helium to 1.5 to 1.7 K, and antiproton-to-electron mass ratio
- Source :
- Science (New York, N.Y.). 354(6312)
- Publication Year :
- 2016
-
Abstract
- Exotic molecule tests fundamental symmetry Spectroscopy of exotic molecules can offer insight into fundamental physics. Hori et al. studied the transition frequencies of an unusual helium atom in which one of the two electrons was substituted by an antiproton, the negatively charged antiparticle partner of the proton (see the Perspective by Ubachs). The antiprotonic helium was cooled down to low temperatures to allow the frequencies to be measured with high precision. The extracted mass of the antiproton (relative to the electron mass) was in good agreement with previous measurements of the proton mass. This finding is in keeping with the implications of the combined charge, parity, and time-reversal symmetry of physical laws. Science , this issue p. 610 ; see also p. 546
- Subjects :
- Antiparticle
ANTIHYDROGEN
Helium atom
Proton
Buffer gas
TRANSITIONS
Electron
PROTON
01 natural sciences
Nuclear physics
chemistry.chemical_compound
0103 physical sciences
010306 general physics
Spectroscopy
LASER SPECTROSCOPY
Antiprotonic helium
Physics
ATOMIC MASS
HYDROGEN
CONSTANTS
FORCES
CHARGE
CPT
Multidisciplinary
010308 nuclear & particles physics
chemistry
Antiproton
Atomic physics
Subjects
Details
- ISSN :
- 10959203
- Volume :
- 354
- Issue :
- 6312
- Database :
- OpenAIRE
- Journal :
- Science (New York, N.Y.)
- Accession number :
- edsair.doi.dedup.....1a6fb028b4000fa4924c4dfbe98353e3