March 2015 runs @ IAC

DU runs

TDC spectrum

DTC

Target in vs. target out

Gamma peak is revealed by comparing target in and target out runs.

ToF

[math]Neutron TOF=\frac{PMT_{top}+PMT_{bottom}}{2}-t_{\gamma peak}+\gamma_{TOF}[/math]

target_in_vs_target_out_ToF

Energy

Neutron Energy:

[math]\frac{1}{2}m_{n}\left(\frac{in}{ns}\right)^2=3.372\left(\frac{42}{t}\right)^2 MeV[/math]

Watt distribution:

[math]Ce^{-aE^'}\sinh\left(\sqrt{bE^'}\right)=0.708 e^{-0.884 E^'}\sinh \left(\sqrt{E^'}\right)[/math]

Second Hit

Odd TDC spectrum in the second hit:

Applying cuts based on TDC difference could help:

Opening angles

Uncorrelated distribution from detectors 1-4:

Analyzing 5653446 pulses from DU runs, I was able to find 349 two-neutron events in detectors 1-4.

As a test I did the same for gamma events: