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We have measured the antineutrino asymmetry B in neutron beta decay, i.e., the correlation of the neutron spin and the antineutrino momentum, with a new method. Our result is B=0.967±0.006stat±0.010syst=0.967±0.012. Statistical and systematic uncertainty can be considerably reduced in future experiments.
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Kreuz et al. (2005) studied this question.
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