The angular correlation between the electron and antineutrino in nuclear beta decay is characterized by the dimensionless parameter "a". A precision measurement of the "a" coefficient and the neutron lifetime can be used to determine the weak vector( GV) and axial vector (GA) coupling constants and test the validity and self-consistency of the Standard Model. The aCORN experiment employed a novel technique in which the angular correlation is converted into a proton time-of-flight asymmetry avoiding the need for precision proton spectroscopy that all the previous "a" coefficient measurement experiments used. The experiment was run in two phases. The result from the first phase of the experiment has been published and will be the scope of the presentation. The obtained value of the "a" coefficient from the first phase is the most precise measurement of the neutron "a" coefficient reported to date.