Experimental neutrino physics has come a long way since the first detection of antineutrinos in 1956. Significant technical advancements (e.g. lower energy threshold, better energy resolution) have created unique opportunities for other fields of physics, such as nuclear physics. This talk shows how the thermal neutron capture (on proton) cross section was measured using the SNO+ detector. This measurement in SNO+ also paves the way to the first observation of antineutrinos in pure water.