REGISTRATION OF NEUTRONS WITHIN 2 MILLISECONDS AFTER EAS

We register an excess of signals from neutron detectors within a few milliseconds after passage of EAS front in Łodź EAS array. The most probable explanation is that neutrons are produced in EAS hadron interactions with lead block of muon detector. These neutrons diffuse and are thermalized before the detection. We present experimental data and results of simulations using MCNP code. This "new EAS observable" can be used as inexpensive hadron detector in EAS.