Neutral currents induced matter oscillations of electroweak-active (an
ti-)neutrinos to sterile neutrinos can explain the observed motion of
pulsars. In contrast to a recently proposed explanation of the pulsar
birth velocities based on the v(mu,tau) <--> v(e) oscillations, the he
aviest neutrino (either active or sterile) would have to have mass of
order several keV. (C) 1997 Elsevier Science B.V.