New measurements of the antineutrino-spin asymmetry in Beta decay of the neutron and restriction for mass of WR
Kuznetsov I.A., Serebrov A.P., Stepanenko I.V., Aldushchenkov A.V., Lasakov M.S., Kokin A.A.. Mostovoi Yu.A., Yerozolimsky B.G., Dewey M.S.
In this work we report on new results of measurements of neutron antineutrino— spin asymmetry coefficient В in beta decay of polarized neutrons. This work has been carried out on the polarized neutron vertical channel of the WWR-M reactor at PNPI (Gatchina). Prom results of measurements of the experimental asymmetry, x — BP ™ 0.6617± 0.0044, and from results of measurements of the beam polarization, Ρ (66.88 ± 0.22)%, the value of the antineutrino spin asymmetry coefficient was obtained: В ~ 0.9894 ± 0.0083. This allows us to place restrictions on M\vR : Mw„ > 282 Gev/c2 (90% C.L.). .