Abstract
Measurements of the electron-neutrino angular correlation coefficient $a$ in the free-neutron decay are reported. The method is based on the measurement of the energy spectrum of recoil protons obtained from neutrons inside a highly evacuated tangential reactor beam tube. Spectroscopy was done outside the reactor shielding by means of an electrostatic condenser and an ion-electron converter detector of the coincidence type. The result, based on 30 measured proton-energy spectra, is $a=\ensuremath{-}0.099\ifmmode\pm\else\textpm\fi{}0.011$, giving $|\frac{{G}_{A}}{{G}_{V}}|=1.250\ifmmode\pm\else\textpm\fi{}0.036$. Thus a considerable improvement in accuracy concerning the measurement of $a$ of the free unpolarized neutron has been achieved. The result is in good agreement with the data obtained from polarized neutron decay.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.