High-precision laser spectroscopy of antiprotonic helium atomcules and effects of collisions at high-density conditions |
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Authors: | Hiroyuki A Torii |
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Institution: | (1) Institute of Physics, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan |
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Abstract: | We have performed laser spectroscpy of metastable antiprotonic helium atoms (or “atomcules”) (
He+) and have observed a density dependence of the resonance vacuum wavelengths for the known transitions (n,l)=(39,35)→(38,34) and (37,34)→(36,33). They showed linear red-shifts of 0.61±0.01 GHz and 0.22±0.02 GHz per 1 g℞, respectively. With the shift parameters above, the transition vacuum wavelengths were extrapolated to zero-density limits,
yielding λ0 = 597.2570± 0.0003 nm and λ0 = 470.7220±0.0006 nm, respectively. These values were compared with the result of recent theoretical calculations on the
energy of the Coulombic three-body system, including relativistic corrections and the Lamb shift. The agreements between our
experimental values and the calculations have become as good as 2×10-6. This sets a severe constraint on the antiproton charge (
) and mass (
) with |Q
p -
|/e < 5 × 10-7 and |M
p
-
|/M
p
< 5 × 10-7, under a more precisely known constraint on the charge-to-mass ratio. Thus we have opened a new possibility of measuring
fundamental constants of the antiproton.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | antiprotonic helium atomcule laser-induced annihilation spectroscopy density shift collisional broadening antiproton charge antiproton mass antiprotonic Rydberg constant |
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