  In our previous work [Phys. Rev. C 101, 014003 (2020)], the photoproduction
reaction $\gamma p \to K^{\ast +} \Lambda$ has been investigated within an
effective Lagrangian approach. There, the reaction amplitudes were constructed
by including the $t$-channel $K$, $K^\ast$, and $\kappa$ exchanges, the
$u$-channel $\Lambda$, $\Sigma$, and $\Sigma^\ast$ exchanges, the $s$-channel
$N$, $N(2000)5/2^+$, and $N(2060)5/2^-$ exchanges, and the interaction current.
It has been shown that the data on both the differential cross sections and the
spin density matrix elements were simultaneously and satisfactorily described.
In this paper, we study the photoproduction reaction $\gamma n \to K^{\ast 0}
\Lambda$ based on the same reaction mechanism as that of $\gamma p \to K^{\ast
+} \Lambda$ with the purpose of getting a unified description of the data for
both $\gamma p \to K^{\ast +} \Lambda$ and $\gamma n \to K^{\ast 0} \Lambda$
within a same model. All hadronic coupling constants, form factor cutoffs, and
the resonance masses and widths in the present calculations remain the same as
in our previous work for $\gamma p \to K^{\ast +} \Lambda$. The available
differential cross-section data for $\gamma n \to K^{\ast 0} \Lambda$ are well
reproduced. Further analysis shows that the cross sections of $\gamma n \to
K^{\ast 0} \Lambda$ are dominated by the contributions of the $t$-channel $K$
exchange, while the $s$-channel $N(2000)5/2^+$ and $N(2060)5/2^-$ exchanges
provide considerable contributions as well.
