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The scattering of spin-1 bosons in a nonminimal vector double-step potentialis described in terms of eigenstates of the helicity operator and it is shownthat the transmission coefficient is insensitive to the choice of thepolarization of the incident beam. Poles of the transmission amplitude revealthe existence of a two-fold degenerate spectrum. The results are interpreted interms of solutions of two coupled effective Schr\"{o}dinger equations for afinite square well with additional $\delta $-functions situated at the borders.

Transmission coefficient and two-fold degenerate discrete spectrum of spin-1 bosons in a double-step potential