  Using kaon secondary interactions in the material of the Belle detector, we
search for both inclusive and exclusive production of the Theta(1540)+. We set
an upper limit of 2.5% at the 90% C.L. on the ratio of the Theta(1540)+ to
Lambda(1520) inclusive production cross sections. We also search for the
Theta(1540)+ as an intermediate resonance in the charge exchange reaction K+ n
-> p Ks. An upper limit of Gamma(Theta+)<0.64MeV at the 90% C.L. at
m(Theta+)=1.539MeV is set. These results are obtained from a 397/fb data sample
collected with the Belle detector near the Upsilon(4S) resonance, at the KEKB
asymmetric energy e+e- collider.
