# Method 1:

## Calculation

When electron beam hit the radiator, TDC start to count. It will take gamma 14 ns to reach the target. Then after some time , neutron arrive to the detectors.

Let's call the the total time from electron beam hit the radiator to neutron to be detected is . So,

where d is the distance between detector and target, v is speed of neutron. So,

where should be in the unit of nano second.

or click on:

# Method 2: Using time difference in two peaks

## Calculation

If we assume gamma flash is coming from target, then by time difference in gamma peak and neutron peak, we can tell the energies in neutrons.

: Neutron time of flight

: Gamma time of flight

d: Distance between detector and target.

d for polarized case: = 91.25 inches = 231.775 cm.

d for unpolarized top detector: =96.25 inches = 244.745 cm.

d for unpolarized side detector: =91.39 inches = 232.131 cm.

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=>

## Data

For data go to Link below:

or click on:

### Energy vs Channel

We calibrated ADC [[1]] and using those data we can tell energy of neutron by its relative channel number difference from gamma peak.

There a two scale for ADC. One is 2000 ns, the other one is 5000ns.

For 2000 ns scale:

For 5000 ns scale: