| Autor: |
Beck, M., Guardia, F. Ayala, Baeßler, S., Borg, M., Glück, F., Heil, W., Kahlenberg, J., Klopf, M., Konrad, G., Maisonobe, R., Horta, R. Muñoz, Schmidt, C., Schmidt, U., Simson, M., Soldner, T., Virot, R., Wunderle, A., Zimmer, O. |
| Rok vydání: |
2019 |
| Předmět: |
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| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevC.101.055506 |
| Popis: |
We report on a precise measurement of the electron-antineutrino angular correlation ($a$ coefficient) in free neutron beta-decay from the $a$SPECT experiment. The $a$ coefficient is inferred from the recoil energy spectrum of the protons which are detected in 4$\pi$ by the $a$SPECT spectrometer using magnetic adiabatic collimation with an electrostatic filter. Data are presented from a 100 days run at the Institut Laue Langevin in 2013. The sources of systematic errors are considered and included in the final result. We obtain $a = -0.10430(84)$ which is the most precise measurement of the neutron $a$ coefficient to date. From this, the ratio of axial-vector to vector coupling constants is derived giving $|\lambda| = 1.2677(28)$. |
| Databáze: |
arXiv |
| Externí odkaz: |
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