Improved determination of the β−ν¯e angular correlation coefficient a in free neutron decay with the aSPECT spectrometer

Autor:	Gertrud Konrad, F. Ayala Guardia, R. Virot, Werner Heil, Michael Klopf, R. Maisonobe, J. Kahlenberg, Ulrich Schmidt, M. Borg, C. Schmidt, Ferenc Glück, Marcus Beck, A. Wunderle, R. Muñoz Horta, O. Zimmer, M. Simson, T. Soldner, S. Baeßler
Rok vydání:	2020
Předmět:	Physics Coupling constant Spectrometer 010308 nuclear & particles physics Spectrum (functional analysis) Lambda 01 natural sciences Collimated light Filter (large eddy simulation) 0103 physical sciences Neutron Atomic physics Nuclear Experiment 010306 general physics Adiabatic process
Zdroj:	Physical Review C. 101
ISSN:	2469-9993 2469-9985
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:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7682594b176392de2d8a344f12d7a80d https://doi.org/10.1103/physrevc.101.055506 Zobrazit plný text záznamu