X-talk between n-dets

The simulation of the cross talk between two neutron detectors was performed using GEANT4 program. The simulated detector layout is shown below:

The following stages of simulation of the x-talk were considered:

1) the x-talk effect is due to the acceptance of the analysing detector, i.e. there was no shielding in between the two detectors;

2) only 2" of borated poly was placed in between;

3) borated poly was placed in between two layers of 1" lead layers;

4) 2 cm Al layer was added to the shielding described in stages 1)-3) from the side of the analysing detector.

The number of incident particle (neutrons) was [math]10^5[/math] and their energy spectrum is shown below:

Neutrons were incident uniformly over the surface of one of the neutron detectors normally to the surface w/o hitting the shielding and the analysing detector such that we have pure x-talk effect due to neutron interaction with the material BC-420 of the neutron detector being irradiated. The analysing detector detected all the particles scattered/produced in the shielding/BC-420.

Stage 1 of the simulation

The energy spectrum of all possible particles entering the analysing detector is presented below:

Out of the cumulative particle energy spectrum we have the following number of neutrons:

the following number of photons:

and the following number of protons:

Stage 2 of the simulation

The energy spectrum of all possible particles entering the analysing detector after placing 2" of borated poly in between the detectors is presented below:

Out of the cumulative particle energy spectrum we have the following number of neutrons:

the following number of photons (photon peak ~2.2MeV can be seen as a result of neutron capture reaction):

and the following number of protons:

Stage 3 of the simulation

The energy spectrum of all possible particles entering the analysing detector after adding 2 layers of 1" lead placed at the sides of the 2" borated poly is presented below:

Out of the cumulative particle energy spectrum we have the following number of neutrons:

NO neutrons observed.

the following number of photons:

and the following number of protons:

Stage 4 of the simulation

The energy spectrum of all possible particles entering the analysing detector after adding 2 cm of Aluminium to 2 layers of 1" lead placed at the sides of the 2" borated poly is presented below:

NO neutrons observed.

the following number of photons:

and the following number of protons: