  We investigate the reaction mechanism of $K^0 \Lambda$ photoproduction off
the neutron target, i.e., $\gamma n \to K^0 \Lambda$, in the range of $W\approx
1.6-2.2$ GeV. We employ an effective Lagrangian method at the tree-level Born
approximation combining with a Regge approach. As a background, the
$K^*$-Reggeon trajectory is taken into account in the $t$ channel and $\Lambda$
and $\Sigma$ hyperons in the $u$-channel Feynman diagram. In addition, the role
of various nucleon resonances listed in the Particle Data Group (PDG) is
carefully scrutinized in the $s$ channel where the resonance parameters are
extracted from the experimental data and constituent quark model. We present
our numerical results of the total and differential cross sections and compare
them with the recent CLAS data. The effect of the narrow nucleon resonance
$N(1685,1/2^+)$ on cross sections is studied in detail and it turns out that
its existence is essential in $K^0 \Lambda$ photoproduction to reproduce the
CLAS data.

High Energy Physics - Phenomenology;High Energy Physics - Experiment;Nuclear Experiment;Nuclear Theory