  We have found an interesting event registered by the solar neutron telescopes
installed at high mountains in Bolivia (5250 m a.s.l.) and Mexico (4600 m
a.s.l.). The event was observed November 7th of 2004 in association with a
large solar flare of magnitude X2.0. Some features in our registers and in two
satellites (GOES 11 and SOHO) reveal the presence of electrons and protons as
possible products of neutron decay. Solar neutron decay protons (sndp) were
recorded on board ISEE3 satellite in June 3rd, 1982 . On October 19th, 1989,
the ground level detectors installed in Goose Bay and Deep River revealed the
registration of solar neutron decay protons (sndp). Therefore this is the
second example that such an evidence is registered on the Earth's surface.
