  Low energy anti-neutrinos detected from reactors or other sources have
typically used the conversion of an anti-neutrino on Hydrogen, producing a
positron and a free neutron. This neutron is subsequently captured on a
secondary element with a large neutron capture cross section such as gadolinium
or cadmium. We have studied the anti-neutrino conversion and suggest other
elements that have a comparable cross section for anti-neutrino reactions. With
most neutron captures on gadolinium, it is possible to get two or three delayed
gamma signals of known energy to occur. Experiments like ATLAS can make
measurements with timing on the order of 25 ns. With electronics like these,
this leads to the possibility of having a triple delayed coincidence using the
positron annihilation on atomic shell electrons as the starting signal. We have
also found an isotope of tungsten, $^{183}$W that offers a large anti-neutrino
interaction cross section of $1.19 \times 10^{-46}$ m$^2$ and an anti-neutrino
threshold energy for the production of the ground state at 2.094 MeV and the
production of the first excited state at 2.167 MeV. This reaction makes a
nuclear m1 excited state of $^{183}$Ta$^*$ that emits a signature secondary
gamma pulse of 73 keV with a 106 ns half-life. This offers a new delayed
coincidence technique that can be used to identify anti-neutrinos with lower
background noise. This allows for less shielding than required for modern
inverse beta decay detectors.
