aCORN: Measuring the electron-antineutrino correlation in neutron beta decay
1 Tulane University, New Orleans, LA 70118, USA
2 Hamilton College, Clinton, NY 13323, USA
3 National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
4 DePauw University, Greencastle, IN 46135, USA
5 Indiana University, Bloomington, IN 47408, USA
a e-mail: firstname.lastname@example.org
b e-mail: Current address: University of Washington, Seattle, WA, USA
c e-mail: Current address: NIST, Gaithersburg, MD, USA
d e-mail: Current address: Lawrence Livermore National Laboratory, Livermore, CA, USA
Published online: 12 December 2019
The aCORN experiment uses a novel asymmetry method to measure the electron-antineutrino correlation (a-coefficient) in free neutron decay that does not require precision proton spectroscopy. aCORN completed two physics runs at the NIST Center for Neutron Research. The first run on the NG-6 beam line obtained the result a = 0.1090 +/- 0.0030 (stat) +/- 0.0028 (sys), the most precise to date. The second run on the new NG-C high flux beam line promises an improvement in precision to ¡ 2%. In addition we show that an improved measurement of the neutrino asymmetry (B-coefficient) can be made using the aCORN apparatus on a highly polarized neutron beam.
© The Authors, published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.