A newly-born pulsar is covered by the expanding dense envelope, and high-energy charged particles accelerated near the pulsar are effectively converted into high-energy neutrinos with energies of 10 13 "-'10 14 eV through meson production and its decay. Such a opaque phase continues for a couple of months. This model was first proposed by Berezinsky, but we will show that his flux estimation is too high by a factor of "-'10 5 • This reduction is needed because the particle flux is limited by

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... accompanying phenomena such as the source power of high-energy cosmic rays and the light element production rate by spallation nuclear reaction.