Phys. Rev. A 70, 032106 (2004) [6 pages]WKB approximation for multichannel barrier penetrabilityReceived 30 April 2004; published 21 September 2004 Using the method of the local transmission matrix, we generalize the well-known WKB formula for barrier penetrability to multichannel systems. We compare the WKB penetrability with a solution of the coupled-channels equations, and show that the WKB formula works well at energies well below the lowest adiabatic barrier. We also discuss the eigenchannel approach to a multichannel tunneling, which may improve the performance of the WKB formula near and above the barrier. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.70.032106
DOI:
10.1103/PhysRevA.70.032106
PACS:
03.65.Xp, 03.65.Sq, 24.10.Eq, 25.70.Jj
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