HIGH-ACCURACY 3-BODY COUPLED-CHANNEL CALCULATION OF METASTABLE STATESOF ANTIPROTONIC HELIUM-ATOMS

High-precision Coulomb three-body calculation is performed for energie s of metastable states of the antiprotonic helium atom having large in teracting angular momenta of 30-40. Use is made of coupled-rearrangeme nt-channel variational method with Jacobian-coordinate Gaussian basis functions which has successfully been employed in the study of various few-body systems. The resonant boundary condition of the metastable l evels is explicitly taken into consideration within the complex-coordi nate-rotation method. Observed transition wavelength are precisely rep roduced by the calculation.