- The approximate analytical solutions of the Dirac equations with the reflectionless-type and Rosen-Morse potentials including the spin-orbit centrifugal (pseudo-centrifugal) term are obtained. Under the conditions of spin and pseudospin (pspin) symmetry concept, we obtain the bound state energy spectra and the corresponding two-component upper-and lower-spinors of the two Dirac particles by means of the Nikiforov-Uvarov (NU) method in closed form. The special cases of the s-wave kappa = +/- 1(l = (l) over tilde = 0) Dirac equation and the nonrelativistic limit of Dirac equation are briefly studied. (C) 2012 Elsevier Inc. All rights reserved.
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