Figure 4
From: Proof-of-principle experiment for laser-driven cold neutron source
Experimental results. (a) is the raw signal recorded using EJ-232Q plastic scintillator and the corresponding spectrum shown in (b), which was calculated by taking into account the detector distance, efficiency and the transmission. (c) demonstrating the neutron spikes generated by nuclear reaction of \(^3\hbox {He}(n,p)^3H\) in the proportional counter for a typical moderator shot (with hydrogen) and no moderator shot (without hydrogen). The background-subtracted data at 20 cm exit surface of the moderator showing a good agreement with the Monte-Carlo simulation results as shown in (d). The broadened peak of neutrons extended its tail reaching 0.8 meV and has been confirmed using two Maxwellian numerically calculated fits for the cold and thermal temperature. The navy blue line is showing the contribution of the wing moderator which is barely reaching the thermal peak.
