Some solutions of a supersymmetric nonpolynomial oscillator-a comparison between the SWKB and WKB methods

Abstract
It is shown that the non-polynomial oscillator represented by V(x)=x2+ lambda x2//(1+gx2) can be given a supersymmetric form if the parameter lambda satisfies a certain constraint. In this case one finds an exact analytic expression for the ground state. Excited states corresponding to this potential are computed for several values of g (and lambda ) using the supersymmetric WKB method, the ordinary WKB method and also numerical integration. The results are compared.