Measurement of the Electron-Antineutrino Angular Correlation in Neutron β Decay
Abstract
We report the first result for the electron-antineutrino angular correlation (a coefficient) in free neutron β decay from the aCORN experiment. aCORN uses a novel method in which the a coefficient is proportional to an asymmetry in proton time of flight for events where the β electron and recoil proton are detected in delayed coincidence. Data are presented from a 15 month run at the NIST Center for Neutron Research. We obtained a =-0.1090 ±0.0030 (stat ) ±0.0028 (sys ) , the most precise measurement of the neutron a coefficient reported to date.
- Publication:
-
Physical Review Letters
- Pub Date:
- July 2017
- DOI:
- 10.1103/PhysRevLett.119.042502
- Bibcode:
- 2017PhRvL.119d2502D