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.
New results of measurements of neutron antineutrino-spin asymmetry coefficient В in the beta decay of polarized neutrons are reported. This work was carried out on the polarized neutron vertical channel of the WWR-M reactor at PNPI (Gatchina). The value of the antineutrino spin asymmetry coefficient was obtained from the results of measurements of the experimental asymmetry, x = BP = 0.6617 + 0.0044, and from the results of measurements of the beam polarization, P = (66.88±0.22)%: 5 = 0.9894±0.0083. This allows us to place restrictions on ΜWr. MWr > 282 GeV/c2 (90% c.l.). © 1994 American Institute of Physics.