Recent results from the aCORN experiment

Free neutron decay into a proton, electron, and antineutrino is one of the simplest examples of nuclear beta decay. The electron-antineutrino~correlation ($a$-coefficient) is one important experimental observable of neutron decay. Along with other observables such as the neutron lifetime and beta asymmetry, the $a$-coefficient can be used~to determine the charged weak couplings of neutrons and protons, measure the CKM matrix element Vud, and conduct precision low~energy tests of physics beyond the Standard Model. The aCORN experiment uses a novel ``wishbone asymmetry'' method~that does not require detailed proton spectroscopy to measure the neutron~$a$-coefficient. We will present results from the second aCORN run on the high-flux~beamline NG-C at the NIST Center for Neutron Research.