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Physical Review Letters – 2 April 2004
Volume 92, Issue 13

Radial orbits (black lines) of the positron in an antihydrogen atom crossing a magnetic field. The positron moves in an effective potential (colored lines) from field-induced coupling between internal and center-of-mass motions. Its orbits can be either near the antiproton (left), in an unusual giant dipole basin (inner right), or around both (outer). [D. Vrinceanu, B. E. Granger, R. Parrott, H. R. Sadeghpour, L. Cederbaum, A. Mody, J. Tan, and G. Gabrielse, Phys. Rev. Lett. 92, 133402 (2004)]

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