Cover Image

Improved determination of the β-[nu][bar]e angular correlation coefficient a in free neutron decay with the aSPECT spectrometer

We report on a precise measurement of the electron-antineutrino angular correlation (a coefficient) in free neutron beta decay from the aSPECT experiment. The a coefficient is inferred from the recoil energy spectrum of the protons which are detected in 4π by the aSPECT spectrometer using magnetic a...

Full description

Saved in:
Bibliographic Details
Main Authors: Beck, Marcus (Author) , Schmidt, Ulrich (Author)
Format: Article (Journal)
Language:English
Published: 26 May 2020
In: Physical review
Year: 2020, Volume: 101, Issue: 5
ISSN:2469-9993
DOI:10.1103/PhysRevC.101.055506
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevC.101.055506
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevC.101.055506
Get full text
Author Notes:M. Beck, F. Ayala Guardia, M. Borg, J. Kahlenberg, R. Muñoz Horta, C. Schmidt, A. Wunderle, and W. Heil, R. Maisonobe, M. Simson, T. Soldner, R. Virot, and O. Zimmer, M. Klopf and G. Konrad, S. Baeßler, F. Glück, U. Schmidt
Description
Summary:We report on a precise measurement of the electron-antineutrino angular correlation (a coefficient) in free neutron beta decay from the aSPECT experiment. The a coefficient is inferred from the recoil energy spectrum of the protons which are detected in 4π by the aSPECT spectrometer using magnetic adiabatic collimation with an electrostatic filter. Data are presented from a 100-day 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 |λ|=1.2677(28).
Item Description:Im Titel ist "nu" als griechischer Buchstabe dargestellt
Im Titel steht der griechische Buchstabe "nu" mit einem Oberstrich
Im Titel ist der Buchstabe e tiefgestellt
Gesehen am 17.09.2020
Physical Description:Online Resource
ISSN:2469-9993
DOI:10.1103/PhysRevC.101.055506

Similar Items