Cross-Calibration of Neutron Detectors for the Dense Plasma Focus FN-II Time of Flight Analysis

The \textit{Fuego Nuevo II} (FN-II) dense plasma focus machine is a small device ($\sim $5kJ @ 37 kV). In order to have an adequate picture of the neutron pulse with temporal resolution, a set of five similar scintillation-photomultiplier detectors have been assembled, using BC-400 scintillators, 50 mm high and 120mm radius, coupled to photomultipliers. These detectors are shielded by a lead wall, 50 mm thick. This work shows some preliminary results, in which a response of the five systems is shown, when they are placed 7.5 m away from the neutron source. A comparison between the time integrated neutron pulses and the neutron yield, measured with silver activation counters, is made.